Operation 7

HES/MES 10/50/250 A 1800 bis 2400 Material feed

7 Operation

7.1 Material feed

The objective is to establish an even flow of material (air conveying) during suction. The air supply at
the suction point is adjusted for an even conveyor air flow.

The air supply at the suction point must be readjusted every time the material changes
because of the different flow properties of the various types of granulate.
Note

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7 Operation
General information on the controller HES/MES 10/50/250 A 1800 bis 2400

7.2 General information on the controller

The hopper loader controller has fixed parameter sets. An appropriate parameter set can be set as
needed.

The hopper loader is preset with parameter set 1 at the factory.

Note

The following parameter sets are available for the HES/MES 10/50/250 hopper loaders.

Function
Parameter Hopper Feed METROMIX Purging Grinding Filter cleaning Filter cleaning
set loader delay after conveying before and after
model conveying
HES/MES
1 X X
10/50/250
2 HES 50/250 X X X
HES/MES
3 X X X
10/50/250
4
5
6
HES/MES
7 X X X
10/50/250
8 HES 50/250 X X X
HES/MES
9 X X X
10/50/250
HES/MES
10 X X X
10/50/250

Parameter sets 7, 8 and 9 must be used for granulate with a high dust particle content.

Parameter sets and the respective values to be set

Values
Parameter set Conveying time Material Number of material Discharge Grinding delay
percentage B in layers A and B time
%
1 X
2 X X X
3 X X
4
5
6
7 X X
8 X X X
9 X X
10 X X

32 11/2010
 Operation 7
HES/MES 10/50/250 A 1800 bis 2400 Operation

7.3 Operation

7.3.1 Switch loader on

The following requirements apply to operation of the hopper loader:
„ The loader is connected to the power grid.
„ The suction pipe is correctly positioned, the air suction opening of the suction pipe is free.
„ The parameter set is selected correctly
„ The values within the selected parameter set are set properly
„ The filter cleaning unit is connected to the compressed-air network

The hopper loader is preset with parameter set 1 at the factory.

„ Loading time: 8 seconds for HES/MES 50/250
Note „ Loading time: 4 seconds for HES/MES 10
„ Discharge time: 5 seconds
„ Filter cleaning: 3 compressed-air blasts

1 2

9 4 [1] "Alarm" display

[2] "Vacuum" display
5 [3] Display
8
[4] Connection for mixing branch/discharge valve
7 [5] Keyboard
[6] "Level" display
[7] "Empty suction“ display
6 BA282C-80.0.001 [8] "Mat. A, Mat. B" display
[9] Mains switch
Fig. 7.1 - METRO HES/MES operating control elements

Î Switch on the hopper loader at the mains switch [9]

Z The hopper loader is switched on
Z During the lamp test, all displays illuminate and display [3] briefly shows the software version
Z The hopper loader is then ready for operation; the display shows "On"
The hopper loader continues to run automatically. No other operations are required.

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7 Operation
Operation HES/MES 10/50/250 A 1800 bis 2400

1 Material is conveyed, and the "Level" display [6] (yellow) illuminates.

– METRO HES: material required by the proximity switch (see "Function" on Page 28).
– METRO MES: material required by the material sensor (see "Function" on Page 28).

2 Material is being conveyed

– The turbine is switched on, and the "Vacuum" display [2] (green) illuminates.
– The remaining conveying time is shown in the display [3]
– At the end of the loading time the turbine is switched off. At the same time, several pressure blasts are
sent to the hopper loader through the filter cleaning valve and the filter is cleaned. "--" is shown in the
display.

3 The hopper loader is emptied

– METRO HES: The weight of the conveyed granulate presses the discharge flap open, and the "Level"
display [6] goes out.
– The remaining discharge time is shown in display [3]
– METRO MES: If the material sensor is covered with material, the "Level“ display [6] goes out.

4 Monitoring the loading amount

– METRO HES: At the end of the discharge time, the discharge flap must remain open and the "Level"
display [6] does not illuminate. If the discharge flap is closed after the discharge time passes,
insufficient material was conveyed. After the set alarm time passes, the Alarm display flashes [1].
– Metro MES: At the end of the alarm time the material sensor must be covered with material, the
"Level“ [6] display does not illuminate. If the material sensor is not covered with granulate at the end of
the alarm time, not enough material was conveyed and the Alarm [1] display flashes.

34 11/2010
 Operation 7
HES/MES 10/50/250 A 1800 bis 2400 Set loader

7.3.2 Switch loader off

1 2

4 [1] "Alarm" display

9
[2] "Vacuum" display
5 [3] Display
8
[4] Connection for mixing branch/discharge valve
[5] Keyboard
7
[6] "Level" display
[7] "Empty suction“ display
[8] "Mat. A, Mat." display
6 BA282C-80.0.001
[9] Mains switch
Fig. 7.2 - METRO HES/MES operating control elements

Î Switch off the hopper loader at the mains switch [9].

Z The hopper loader is switched off, and any conveying cycle started is interrupted

7.4 Set loader

The following settings can be made on the HES/MES hopper loader.
„ Loading time for HES/MES 50/250 (factory setting: 8 seconds)
„ Loading time for HES/MES 10 (factory setting: 4 seconds)
„ Parameters for mixing branch (except HES/MES 10)
„ Parameters for full discharge
„ Parameters for grinding and discharge
„ Parameter set 1 - 10

11/2010 35
7 Operation
Setpoint value entry principle HES/MES 10/50/250 A 1800 bis 2400

7.5 Setpoint value entry principle

7.5.1 Changing the parameter set

Factory setting: Parameter set 1
Î Switch on the mains switch [9]
Î Press the and buttons at the same time within 3 seconds after "On" appears in display [3]

Z The currently set parameter set is displayed

Î Select the parameter set with the or button

Î Press the button.

Z The set parameter set is saved

„ If material required is pending: the hopper loader starts

„ If there is no material required: the hopper loader goes into "Standby mode
"On" appears in display [3]

7.5.2 Switching between "Standby mode" and "Entry navigation"

To set the conveying time, the hopper loader must be in "Standby mode", i.e.
Î The hopper loader is switched on (see 7.3)
Î Material is not being requested; "Level" display [6] is not illuminating
Î Pressing the button longer than 2 seconds initiates the switch between "Standby mode" and "Entry
navigation".

The controller automatically jumps back to "Standby mode" approx. 30 seconds after the last button is
pressed.

36 11/2010
 Operation 7
HES/MES 10/50/250 A 1800 bis 2400 Setpoint value entry principle

7.5.3 Operation in the "Entry navigation", setting the conveying time

In "Entry navigation", flashing displays [2], [6] and [7] indicate the respective selected function, and display [3]
shows the associated current setpoint value.
Pressing the button selects the next function in a cycle.
When "Entry navigation" is reached, the green "Vacuum" [2] display flashes. Display [3] shows the current
conveying time in seconds.

In parameter set 1 only the loading time can be changed, see Section 7.2.

Note

7.5.4 Operating in "Entry mode"

Î Press the entry button
Z "Entry navigation" switches to "Entry mode"
Z The display [2] for the conveying time and display [3] flash.

The setpoint value is changed within the available limits with the and buttons.
In "Entry navigation", flashing displays [2], [6] and [7] indicate the respective selected function, and display [3]
shows the associated current setpoint value.

Î Press the entry button

Z The new setpoint value is saved
Z The controller switches back to "Entry navigation"
Î Press the button
Z The new setpoint value is not saved
Z The controller switches back to "Entry navigation" (comp. to the ESC key on a computer)

The conveying process can only start from Standby mode. To switch from Entry navigation back
to Standby mode, either the button must be pressed and held for approx. 2 seconds or no
buttons must be pressed for approx. 30 seconds, after which the switch occurs automatically.

The loading time is set to 8 seconds at the factory.

Check the fill level after a material change during production and reset the loading time if neces-
sary.
Overfilling the loader can lead to faults!

11/2010 37
7 Operation
Setpoint value entry principle HES/MES 10/50/250 A 1800 bis 2400

38 11/2010
 Troubleshooting 8
HES/MES 10/50/250 A 1800 bis 2400 Fault display

8 Troubleshooting

8.1 Fault display

1 2

9 4
[1] "Alarm" display
5 [2] "Vacuum" display
8 [3] Display
[4] Connection for mixing branch/discharge valve
7 [5] Keyboard
[6] "Level" display
[7] "Empty suction“ display
6 BA282C-80.0.001 [8] "Mat. A, Mat. B" display
[9] Power switch
Fig. 8.1 - METRO HES/MES operating control elements

If the hopper loader has not conveyed material or has conveyed insufficient material five times in
succession, the red "Alarm" display [1] flashes and the contact for the external alarm signal is
switched. The hopper loader continues running with the "Alarm" display [1] flashing. Once sufficient
material is conveyed, the alarm is cleared automatically.
During the first 5 minutes after the hopper loader is switched on, the alarm is suppressed to enable
an initial filling.

The loader automatically switches off after 50 faulty loads. The red "Alarm" display
flashes. The external alarm contact is switched. "E" flashes in the display.
The controller can be reset by switching the hopper loader off and on again.

11/2010 39
8 Troubleshooting
Troubleshooting HES/MES 10/50/250 A 1800 bis 2400

8.2 Troubleshooting

Display [3] does not illuminate during switch-on

Meaning of error Correction

– No power. Î Check connection.

– Power switch defective. Î Replace power switch.

"Level" LED does not light

Meaning of error Correction

– Material sensor defective or incorrectly Î Check settings (see "Check material
adjusted (METRO MES). sensor, METRO HES/MES 50/250" on
Page 51) replace material sensor if
necessary.
– Proximity switch defective or incorrectly Î Check settings (see "Adjusting
adjusted (METRO HES). proximity switch (METRO HES only)"
on Page 54) replace proximity switch if
necessary.

Hopper loader overfilled

Meaning of error Correction

– Conveying time set too high. Î Adjust loading time (see )."Operation in
the "Entry navigation", setting the
conveying time" on Page 37

40 11/2010
 Troubleshooting 8
HES/MES 10/50/250 A 1800 bis 2400 Troubleshooting

LED alarm flashes, no/too little material loaded

Meaning of error Correction

– Conveying time set too low. Î Adjust loading time (see )."Operation in
the "Entry navigation", setting the
conveying time" on Page 37
– No material at suction point. Î Check material feed.

– Air supply at suction pipe blocked. Î Clear air supply at suction pipe.

– Fault at suction box. Î Check material removal.

– Plug in pipe system. Î Remove plug.

– Filter blocked. Î Clean filter (see "Maintenance and

cleaning" on Page 47).
– Leak in vacuum system. Î Check underpressure in vacuum
system.
– Discharge flap leaks (METRO HES). Î Adjust discharge flap (see "Adjusting
discharge flap (METRO HES only)" on
Page 55)

"Vacuum" LED lights but no conveying

Meaning of error
– Actuation relay in control box faulty. Î Replace relay (see spare parts
12.3 Controller).

11/2010 41
8 Troubleshooting
Troubleshooting HES/MES 10/50/250 A 1800 bis 2400

The turbine is not running, the logic continues to run (LEDs illuminate on the controller)

Meaning of error Correction

– Temperature monitoring was triggered Î The temperature monitoring resets
(110° C under the hood - voltage supply to automatically after cooling to approx.
the turbine was switched off) 60° C.
Î The turbine starts again.

– Sensor not connected Î Connect the sensor cable

– Carbon brushes defective (HES 10/50, Î Replace carbon brushes (see

MES 10/50) 9.5.5 Replacing carbon brushes on
HES/MES 10 or 9.5.4 Replacing carbon
brushes on HES/MES 50

If the controller is to run more than 50 conveying cycles without a full signal during
the cool-down time from 110° C to 60° C (HES 50/250) or from 90° C to 60° C (HES
Note
10), the hopper loader will automatically switch off, see 8.1 Fault display.
The controller is reset by switching it off and on.

42 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Safety

9 Maintenance and repair

This chapter contains detailed maintenance and repair instructions and information on regular
inspections.

9.1 Safety

9.1.1 Personnel qualification

DANGER TO LIFE FROM ELECTROCUTION!

Improper electrical connections can lead to severe, even lethal, injuries.

DANGER! Î Only electrical technicians may undertake work on the power supply and electrical
connections.
Î Before starting any service and maintenance work on the loader, disconnect the
unit from the power supply and ensure that the unit cannot be unintentionally
switched back on.

DANGER OF INJURY!
Maintenance and repair conducted by insufficiently qualified personnel may lead to
incalculable risks with negative results for persons, machine and the environment.
WARNING!
Î All maintenance and repair work must be carried out by qualified and authorized
technicians only.

DANGER OF INJURY!
„ Granulate on the floor can cause accidents.
Always keep the workplace clean.
WARNING!
„ Make sure you are not creating risks to people,
e.g. slipping, stumbling or falling, or the environment when laying the connec-
tions.

11/2010 43
9 Maintenance and repair
Safety HES/MES 10/50/250 A 1800 bis 2400

9.1.2 Protective equipment

The following protective equipment is required for maintenance and repair work:

Danger of injury by dust, granulate, etc.

Dust, granulate, etc. may cause eye injuries and injuries to breathing passages.

WARNING! Î Always wear protective glasses.

Î Always wear a respirator.

Wear protective gloves

9.1.3 Safety devices

DANGER OF INJURY!
The operator runs the risk of injury if the safety devices are not operating correctly.

WARNING! Î Check that the safety devices function correctly after work has finished.

44 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Before starting work

9.2 Before starting work

Before starting work, the following conditions must be met.

9.2.1 Maintenance and repair

Read the following notes before beginning maintenance or repair work.

Fig. 9.1 - Safety sticker on the loader

Î Turn off the hopper loader
Î Disconnect power connector and ensure that the unit cannot be operated during maintenance
work.
Î Open the hopper loader cover

9.2.2 Additional information for repair work

Material damage!
Parts which fall into the unit may cause operational faults.

CAUTION! Î Make sure that no parts fall into the unit.

Î Cover the opening of the machine and bin.

Danger of injury!
When removing the air hose beware of impact injuries from the pressure in the com-
pressed air hose.
Caution!
Î Make sure that there is no pressure in the hose before disconnecting it.

Î Remove the pressure hose

Î Remove the hopper loader from the machine or the drying bin

11/2010 45
9 Maintenance and repair
Intervals for inspections, maintenance and cleaning work HES/MES 10/50/250 A 1800 bis 2400

9.3 Intervals for inspections, maintenance and cleaning work

Weekly

Component Activity Target value/Meaning Qualification

Filter cleaning See "Cleaning filter, METRO Operator
HES/MES 50/250" on Page 47

Monthly

Component Activity Target value/Meaning Qualification

Material sensor material sensor See "Checking material Operator
sensor, METRO HES/MES 10"
on Page 52

Annually

Component Activity Target value/Meaning Qualification

Discharge flapi for wear See "Adjusting discharge flap Operator
(METRO HES only)" on
Page 55
i monthly with abrasive plastic granulates

46 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Maintenance and cleaning

9.4 Maintenance and cleaning

9.4.1 Cleaning filter, METRO HES/MES 50/250

Danger of injury by dust, granulate, etc.

Dust, granulate, etc. may cause eye injuries and injuries to breathing passages.

WARNING! Î Always wear protective glasses.

Î Always wear a respirator.

DANGER OF INJURY!
„ Granulate on the floor can cause accidents.
Always keep the workplace clean.
WARNING!
„ Make sure you are not creating risks to people,
e.g. slipping, stumbling or falling, or the environment when laying the connec-
tions.

[1] Filter
BA282C-00.0.122
[2] Groove in cover
Fig. 9.2 - Cleaning filter, HES/MES 50/250

Î Prepare the hopper loader for maintenance (see "Maintenance and repair" on Page 45).
Î Open spring clips on the cover with turbine
Î Open the cover
Î Remove the filter
Î Tap filter and clean filter with a vacuum cleaner
Î Check its condition and replace the filter if necessary (see "Disposal of unit parts" on Page 62)

11/2010 47
9 Maintenance and repair
Maintenance and cleaning HES/MES 10/50/250 A 1800 bis 2400

Structure

[1] Filter
BA282C-00.0.122
[2] Groove in cover
Fig. 9.3 - Installing filter

Insert the filter with the vacuum side (stamp) towards the turbine.

Note

Î Insert filter [1] with the filter gasket evenly positioned over its complete circumference in the
groove in the cover [2].
Î Close the cover with turbine and lock with the spring clips

The filter will become clogged faster when conveying grinding stock.
Reduce cleaning intervals appropriately.
Note

48 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Maintenance and cleaning

9.4.2 Cleaning filter, METRO HES/MES 10

Danger of injury by dust, granulate, etc.

Dust, granulate, etc. may cause eye injuries and injuries to breathing passages.

WARNING! Î Always wear protective glasses.

Î Always wear a respirator.

DANGER OF SLIPPING!
Material pellets can fall on the floor and there is a risk of people slipping on the material
and injuring themselves.
CAUTION!
Î Keep the floor free of material pellets.

Material damage!
When removing the cover with turbine the probe cable may be damaged.

CAUTION! Î Make sure that the probe cable is not placed under tension.

[1] Filter
BA282C-00.0.123
[2] Groove in cover
Fig. 9.4 - Cleaning filter, HES/MES 10

Î Prepare the hopper loader for maintenance (see "Maintenance and repair" on Page 45).
Î Unscrew the sensor cable
Î Open the spring clips on the cover with turbine
Î Lift the cover with turbine off the hopper loader
Î Remove the filter
Î Tap filter and clean with a vacuum cleaner
Î Check its condition and replace the filter if necessary (see "Disposal of unit parts" on Page 62)

11/2010 49
9 Maintenance and repair
Maintenance and cleaning HES/MES 10/50/250 A 1800 bis 2400

Assembly

BA282C-00.0.123
[1] Filter
[2] Groove in cover
Fig. 9.5 - Installing filter

Insert the filter with the vacuum side (stamp, weight) towards the turbine.

Note

Î Insert filter [1] with the filter gasket evenly positioned over its complete circumference in the
groove in the cover [2].
Î Position the cover with turbine on the steel body and lock with the spring clips
Î Screw on the probe cable

The filter will become clogged faster when conveying grinding stock.
Reduce cleaning intervals appropriately.
Note

50 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Maintenance and cleaning

9.4.3 Check material sensor, METRO HES/MES 50/250

Material damage!
Parts which fall into the unit may cause operational faults.

CAUTION! Î Make sure that no parts fall into the unit.

Î Cover the opening of the machine or the drying bin

[1] Bag
[2] Granulate
[3] Active area
[4] Material sensor
[5] Cover adjusting screw
[6] Adjusting screw
BA282C-00.0.125 [7] LED
Fig. 9.6 - Material sensor, HES/MES 50/250

Checking/adjusting material sensor

Î Turn off the hopper loader
Î Fill a transparent bag [1] with granulate [2] and hold the bag [1] with the granulate [2] at a distance
of 10-15 mm from the material sensor [4] until the active area [3] is about half covered
Î Switch loader on
Z The material sensor [4] must switch now. The LED [7] lights.

If the material sensor does not switch, its sensitivity must be readjusted.

Adjusting material sensor

Î Open the cover for the adjusting screw [5] on the material sensor [4].

Setting the sensitivity higher:

Î Turn the adjusting screw [6] right (clockwise)

Setting the sensitivity lower:

Î Turn the adjusting screw [6] to the left (counterclockwise).

Note the position of the adjusting screw. New turn the screw without noting the starting
point, otherwise the correct setting point may be lost.
Note

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9 Maintenance and repair
Maintenance and cleaning HES/MES 10/50/250 A 1800 bis 2400

9.4.4 Checking material sensor, METRO HES/MES 10

Material damage!
Parts which fall into the unit may cause operational faults.

CAUTION! Î Make sure that no parts fall into the unit.

Î Cover the opening of the machine or drying bin

[1] Bag
[2] Granulate
[3] Active area
[4] Material sensor
[5] Cover adjusting screw
BA282C-00.0.126 [6] Adjusting screw
[7] LED
Fig. 9.7 - Material sensor, HES/MES 10

Check/adjust material sensor

Î Turn off the hopper loader
Î Fill a transparent bag [1] with granulate [2] and hold the bag [1] with the granulate [2] at a distance
of 10-15 mm from the material sensor [4] until the active area [3] is about half covered
Î Switch loader on
Z The material sensor [4] must switch now. The LED [7] lights.

If the material sensor does not switch, its sensitivity must be readjusted.

Adjusting material sensor

Î Open the cover for the adjusting screw [5] on the material sensor [4].
Setting the sensitivity higher:
Î Turn the adjusting screw [6] right (clockwise)
Setting the sensitivity lower:
Î Turn the adjusting screw [6] to the left (counterclockwise).

Note the position of the adjusting screw. New turn the screw without noting the starting
point, otherwise the correct setting point may be lost.
Note

52 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Repair work

9.5 Repair work

9.5.1 Replacing material sensor (METRO MES only)

MES 10 MES 50/250

BA282C-00.0.130
[1] Hexagonal nut
[2] material sensor
Fig. 9.8 - Removing material sensor from METRO MES

Removing material sensor

Î Prepare hopper loader for repair (see "Before starting work" on Page 45).
Î Unscrew the sensor cable
Î Loosen the hexagonal nut [1]
Î Unscrew the material sensor [2]

Installing material sensor

Î Assemble in reverse order.
Î After replacement adjust the new material sensor
(see section "Check/adjust material sensor" on Page 52)
Î Conduct a test run

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9 Maintenance and repair
Repair work HES/MES 10/50/250 A 1800 bis 2400

9.5.2 Adjusting proximity switch (METRO HES only)

[1] Proximity switch

BA282C-00.0.131 [2] Hexagonal nuts
Fig. 9.9 - Adjusting proximity switch

Î Prepare hopper loader for repair (see "Before starting work" on Page 45).
Î Close discharge flap
Î Set distance as shown in Figure 9.9
Î Lock proximity switch [1] with the hexagonal nuts [2]

54 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Repair work

9.5.3 Adjusting discharge flap (METRO HES only)

BA282C-00.0.132 [1] Weight

Fig. 9.10 - Positioning weight

Î Slide the weight on the tension pin and lock

For installation position: see Figure 9.10.
Î Tighten threaded pin and lock with Loctite 242

[1] Spring-loaded thrust pad

[2] Discharge flap
BA282C-00.0.133 [3] Discharge
Fig. 9.11 - Adjusting discharge flap

Î Screw the spring-loaded thrust pad [1] (see Figure 9.11) up until there is a gap of 5-8 mm between
the discharge [3] and the discharge flap [2].

The air gap at the discharge flap ensures that particles of granulate on the discharge
flap are sucked in by the vacuum at the start of transport.
The discharge flap is pulled up by the vacuum and forms an airtight seal.
Note

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9 Maintenance and repair
Repair work HES/MES 10/50/250 A 1800 bis 2400

9.5.4 Replacing carbon brushes on HES/MES 50

The electric motor of the fan has carbon brushes with switching contacts.
The contacts automatically switch the fan off if the carbon brushes are worn.
Note

[1] Fan impeller

[2] Retaining pin
[3] Carbon brush
[4] Holder
[5] Screw
Fig. 9.12 - Remove cover

Î Prepare hopper loader for repair (see "Before starting work" on Page 45).
Î Remove silencer cover
Î Unscrew two screws [5] on the side of the carbon brushes [3]
Î Press holder [4] outwards on both sides
Î Carefully pull fan impeller cover [1] upwards
Î Remove retainer springs [2]

56 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Repair work

[1] Connection tag

[2] Carbon brush
Fig. 9.13 - Remove carbon brushes

Î Push carbon brushes [2] back to the installation position until they are retained in this position
Î Lever up the connection lug [1] towards the axis of the carbon brush with a small screwdriver
Î Remove carbon brush

Assembly
Î Insert carbon brushes and insert the connection lug
Î Screw on the retainer springs
Î Replace the fan impeller cover; note the holder
Î Install silencer cover
Î Connect the loader to the power supply and perform a test run.

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9 Maintenance and repair
Repair work HES/MES 10/50/250 A 1800 bis 2400

9.5.5 Replacing carbon brushes on HES/MES 10

The electric motor of the fan has carbon brushes with switching contacts.
The contacts automatically switch the fan off if the carbon brushes are worn.
Note

[1] Carbon brush

[2] Screw
Fig. 9.14 - Remove cover

Î Prepare hopper loader for repair (see "Before starting work" on Page 45).
Î Unscrew two screws [2] on the side of the carbon brushes [1]

58 11/2010
 Maintenance and repair 9
HES/MES 10/50/250 A 1800 bis 2400 Repair work

[1] Connection tag

[2] Carbon brush
Fig. 9.15 - Remove carbon brushes

Î Push carbon brushes [2] back to the installation position until they are retained in this position
Î Lever up the connection lug [1] towards the axis of the carbon brush with a small screwdriver
Î Remove carbon brushes

Assembly
Î Insert carbon brushes and clip the connection lug
Î Screw on the retainer springs
Î Replace the fan impeller cover; note the holder
Î Install silencer cover
Î Connect the hopper loader to the power supply and perform a test run.

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9 Maintenance and repair
Repair work HES/MES 10/50/250 A 1800 bis 2400

60 11/2010
 Appendix 12
HES/MES 10/50/250 A 1800 bis 2400 Wiring diagrams

12.6 Wiring diagrams

11/2010 89
12 Appendix
Wiring diagrams HES/MES 10/50/250 A 1800 bis 2400

90 11/2010
        

 



 

 


  




 


 


 



   

    

 

 
 
 

 
 

 
 

 
 
 

 
 

  
 
    
  
 
     
 
  

         

       
        

   

   

 

   



   



   


 

   



   



   

  

   

   



     

   



   



 
   


   

   
 
    
  
 
     
 
  

         

       
        

   

 

 

 

 


 

  

 


 

 

 

   
 
    
  
 
     
 
  

         

       
        

  


  
 

  



        


 
   
 
 


























     














   


   



   
    

   

   
 
             

  
 

 
 
        
  
 
 
 
   





 
 
 
   

      


   

 

   

     
 


    

  
  
  
   
 




 
 

   

    

   
 
    
  
 
     
 
  

         

       
        

 




 

  


  
 







  
 





 


  
 


   







 





   
 
    
  
 
     
 
  

         

       
        


       

       

 
       

       

      

       

       

      

      

        

 

 

 

   
 
    
  
 
     
 
  

         

       
        

      

      

      

  

      



      



 
      

      

      

 

 

 

  
 
    
  
 
     
 
  

         

       
        

 



 

 


  




 


 


 



   

    

 

 
 
 

 
 

 
 

 
 
 

 
 

  
 
    
  
 
     
 
  

         

       
        

   

   

 

   



   



   


 

   



   



   

  

   

   



     

   



   



 
   


   

   
 
    
  
 
     
 
  

         

       
        

   

 

 

 

 


 

  

 

 

 

   
 
    
  
 
     
 
  

         

       
        

  


  
 

  



        


 
   
 
 


























     














   


   



 
      
  
 

 
   
             
 
 
  
   
         
 
 
 
 
   





 
 
 
   

      


   

 

   

     
 


    

  
  
  
   
 




 
 

   

    

   
 
    
  
 
     
 
  

         

       
        

 




 

  


  
 







  
 





 


  
 


   








 





   
 
    
  
 
     
 
  

         

       
        


       

       

 
       

       

      

       

       

      

      

        

 

 

 

   
 
    
  
 
     
 
  

         

       
        

      

      

      

  

      



      



 
      

      

      

 

 

 

  
 
    
  
 
     
 
  

         

       
        

 



 

 


  




 


 


 



   

     

 
   

 
 
 

 
 

 
 

 
 
 

 
 

  
 
    
  
 
     
 
  

         

       
        

   

   

 

   



   



   


 

   



   



   

  

   

   



     

   



   



 
   

   

   
 
    
  
 
     
 
  

         

       
        

   

 

 

 

 


 

  

 

 

 

   
 
    
  
 
     
 
  

         

       
        

  


  
 

  



        

 
 
   
 
  



























     














   


   



  
      
    

   
 
           
  
  
 
  
  
     
 
 
         








 
 
    

   

   
   
 
   
      
  
  


  



  


 
 



 
 

 


  
     
 
 

   


 


 

    





  
   
 
    
  
 
     
 
  

         

       
        

 




 

  


  
 







  
 





 


  
 


   








 





   
 
    
  
 
     
 
  

         

       
        


       

       

 
       

       

      

       

       

      

      

 

 

 

 

   
 
    
  
 
     
 
  

         

       
        

      

      

      

  

      



      



 
      

      

      

 

      



 

 

  
 
    
  
 
     
 
  

         

       