EN Z-SG Strain Gauge Converter Calibration and
Function Addendum
MODE 1 - USE IF:
- THE USER DOES NOT HAVE A COMPUTER
- THE USER HAS A WEIGHT OF KNOWN VALUE TO ASSOCIATE WITH
THE MAXIMUM VALUE OF THE ANALOG OUTPUT.
= FS analog output
PREPARATION FOR CALIBRATION
ATTENTION:
a - the gross weight (tare + known_weight) must not exceed the maximum
capacity of the strain gauge to avoid damaging it.
b - do not consider the values provided by the analog output during
the calibration phase.
1 - Disconnect the module's power supply.
1 2 3 4 5 6 7 8
2 - Set the dip-switch SW2: SW1
4 ON and 5 ON as in the figure:
1 2 3 4 5 6 7 8
SW2
3 -Set SW2 dip-switches 6, 7 and 8 according to the following table:
STRAIN GAUGE DIP 6 of SW2 DIP 7 of SW2 DIP 8 of SW2
SENSITIVITY
> 0 mV/V & < 1 mV/V OFF OFF OFF
> 1 mV/V & < 2 mV/V OFF OFF ON
> 2 mV/V & < 4 mV/V OFF ON OFF
> 4 mV/V & < 8 mV/V OFF ON ON
> 8 mV/V & < 16 mV/V ON OFF OFF
> 16 mV/V & < 32 mV/V ON OFF ON
> 32 mV/V & < 64 mV/V ON ON OFF
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4 - Set the SW2 DIP 1 OFF; this position is necessary to use the button
on the side of the module or the logic input, for the acquisition of
values during calibration.
5 - Set the DIP 2 and 3 of SW2 to select the type of the analog output as in
the following figure:
0 .. 10 V 0 .. 5 V 0 .. 20 mA 4 .. 20 mA
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SW1 SW1 SW1 SW1
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SW2 SW2 SW2 SW2
6 - Power the Z-SG module.
The module is now in manual calibration mode.
Yellow Led
CALIBRATION OF ZERO or START OF SCALE
7 - Press the calibration button (or give the command to the Calibration
Button
logic input) until the yellow LED is on; then release
the button. After a few seconds the LED begins flashing.
8 - Place the tare in the weighing system (see figure):
TARE Z-SG
STRAIN GAUGE
9 - Press the calibration button again (or give the command via the digital
input) until the yellow LED turns off.
At this point the module has acquired the tare of the system.
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CALIBRATION OF FULL SCALE Yellow Led
10 - Press the calibration button (or give the command to the
logic input) until the yellow LED lights; then release the Calibration
Button
button. After a few seconds the LED begins flashing.
11 - Place the known weight + the tare in the weighing system
(see figure):
Z-SG
KNOWN WEIGHT
50 kg
TARE
STRAIN GAUGE
12 - Press the side button again (or give the command via the logic input)
until the yellow LED switches off.
At this point the module has acquired the known weight.
13 - Disconnect the module's power supply.
14 - Set SW2 DIP-switch 4 OFF and 5 ON (see figure):
1 2 3 4 5 6 7 8
SW1
1 2 3 4 5 6 7 8
SW2
The system is ready for use.
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NOTES:
1 - Once the calibration procedure has been completed, it is still possible
to perform the system TARE by using the external command (after
configuring the logic I/O, terminals 1 and 6, as logic input).
However this tare value will be lost at the next command of TARE given
by the logic input or if module is powered off.
At module restart, the tare value acquired during the initial calibration will
be restored.
2 - If during the calibration procedure, the module is powered down, the
calibration is lost. At power-on, it will be necessary to start calibration from
the beginning.
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MODE 2 - USE IF:
- THE USER DOES NOT HAVE A COMPUTER
- THE USER HAS A STRAIN GAUGE CELL WITH KNOWN SENSITIVITY.
PREPARATION FOR CALIBRATION
ATTENTION:
a - the gross weight (tare + known_weight) must not exceed the maximum
capacity of the strain gauge to avoid damaging it;
b - do not consider the values provided by the analog output during
calibration.
1 - Disconnect the module's power supply.
2 - Set the DIP-switch SW2:
4 ON and 5 OFF as in the figure below:
1 2 3 4 5 6 7 8
SW1
1 2 3 4 5 6 7 8
SW2
3 -Set SW2 dip-switches 6, 7 and 8 according to the following table:
STRAIN GAUGE DIP 6 of SW2 DIP 7 of SW2 DIP 8 of SW2
SENSITIVITY
> 0 mV/V & < 1 mV/V OFF OFF OFF
> 1 mV/V & < 2 mV/V OFF OFF ON
> 2 mV/V & < 4 mV/V OFF ON OFF
> 4 mV/V & < 8 mV/V OFF ON ON
> 8 mV/V & < 16 mV/V ON OFF OFF
> 16 mV/V & < 32 mV/V ON OFF ON
> 32 mV/V & < 64 mV/V ON ON OFF
4 - Set SW2-1 OFF; this is necessary to use the module side button or
the logic input for the acquisition of the values during calibration.
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5 - Set 2 and 3 of SW2 to select the type of analog output as shown below.
0 .. 10 V 0 .. 5 V 0 .. 20 mA 4 .. 20 mA
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SW1 SW1 SW1 SW1
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SW2 SW2 SW2 SW2
6 - Power the Z-SG module.
With DIP switches 4 and 5 of SW2 set as in step 2, it is possible to save
the value of the system tare in EEPROM by performing the following steps.
CALIBRATION OF ZERO or START SCALE ( = SYSTEM TARE )
7 - Place the tare in the weighing system (see figure):
TARE
STRAIN GAUGE
Yellow Led
8 - Press the calibration button (or give the command to the
logic input) until the yellow LED lights. Calibration
Button
Z-SG
At this point the module has acquired the tare which will be used until the
next calibration procedure.
The module stops waiting for a power-off.
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9 - Disconnect the module's power supply.
10 - Set SW2 switch 4 and 5 OFF as in figure:
1 2 3 4 5 6 7 8
SW1
1 2 3 4 5 6 7 8
SW2
The system is ready for use.
NOTES:
1 - Once the calibration procedure has been completed, it will be still possible
to perform the system TARE by using the external command (after
configuring the I/O terminals 1 and 6, as logic input).
However this tare value will be lost at the next command of TARE given
by the logic input or if the module is powered off.
At module restart, the tare value acquired during the initial calibration will
be restored.
2 - If during the calibration procedure, the module is powered-down, the
calibration is lost. At the power-on, it will be necessary to start calibration
from the beginning.
3 - In this mode, the FS of the analog output is associated with the FS of the
strain gauge; however this will be possible only if the tare of the system
is null, otherwise the allowed FS will be:
FSSYSTEM = FS_STRAIN_GAUGE – TARE
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Example: If the strain gauge has a FS equal to 50 Kg, the tare is 10 Kg and
the analog output is set as 0-10 V, the maximum FS of the system will be:
FSSYSTEM = 50 - 10 = 40 Kg
Corresponding to this weight, the analog output is in percentage of FS:
50 Kg - 10 Kg x 100 = 80 %
50 Kg
This results in a voltage output value of 8 Volts.
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Via Austria, 26 - 35127 - PADOVA - ITALY
Tel. +39.049.8705355 - 8705359 - Fax +39.049.8706287
e-mail: info@seneca.it - www.seneca.it
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