FIELD COMPONENT MANUAL Part: 4 - AA3

OTIS No.:
Vintage: 01 / 1
Central & East European Area
Start up Routine Page: 1 / 16
FOD BERLIN OVF20 Date: 29-Jun-1999

OVF20
Start up Routine

Authorization Date D1:

Running on PCB: GBA 26800 H2
Software Version: GAA 30158 AAF

Document Revision :

DateAuthorPageComment30-May-1999G. Priebe1 - 16Original Document

Copyright 1999, OTIS GmbH Berlin. No part of this document may be copied or reproduced
in any form or by any means without the prior written consent of OTIS GmbH.
 FIELD COMPONENT MANUAL Part: 4 - AA3
OTIS No.:
Vintage: 01 / 1
Central & East European Area
Start up Routine Page: 1 / 16
FOD BERLIN OVF20 Date: 29-Jun-1999

Table of Contents
1 Starting up conditions....................................................................................3
2 First Inspection Run (without Encoder)....................................................3
2.1 Checking of voltages....................................................................................................3
2.2 Input Signals Check on the MCB_II using the SVT......................................................4
2.3 Fundamental Parameter Set up...................................................................................4
2.4 Check of Direction........................................................................................................5
3 Prepare first Normal Run............................................................................6
3.1 Adjustment of magnets.................................................................................................6
3.1.1 1-Track Construction....................................................................................6
3.1.2 Position reference system (PRS2)...............................................................7
3.2 Adjustment of Speed Encoder......................................................................................8
3.3 Learn run......................................................................................................................9
4 Final adjustment of Position Reference..................................................11
4.1 Speed Profile..............................................................................................................11
4.1.1 Contract parameters (<M> <3> <1> <GOON>).........................................11
4.1.2 Profile parameter <M> <3> <2> <GO ON>................................................11
4.2 Vane parameters <M> <3> <3> <GO ON>................................................................12
4.2.1 LV DLY UP and LV DLY DOWN (Adjustment of floor level)......................13
4.2.2 IPU/ IPD DLY (Adjustment of creep time)..................................................13
4.2.3 SLU/SLD DLY (Adjustment of Creep time)................................................13
4.2.4 1LS, 2LS (Adjustment of deceleration limit switch)....................................14
4.2.5 T_creep......................................................................................................14
4.3 Event logging..............................................................................................................14
4.4 Parameter storage..................................................................................................... 14
5 Fine Adjustment.........................................................................................15
5.1 Starting Jerk Reduction without load weighing...........................................................15
5.2 Adjustment of Load weighing system.........................................................................15
 FIELD COMPONENT MANUAL Part: 4 - AA3
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1Starting up conditions
Starting up of OVF20 system only should be performed by authorisizied personal!

Caution!

Opening of the package has only to be done for reasons of maintenance

and may only happen if you have checked with measuring instrument (up
to 1000VDC) at terminals PO and BR that the main switch is off and the
value of DC-link voltage of the OVF20 inverter is 0 VDC. Only then you can
begin with working.
The controller cabinet has to be mounted in a distance of 50 mm between wall and the
heatsink of the drive (MCS220(M)).
The mechanical works of hoistway and cabine as well as machine room and hoistway
installations have to be finished to ensure inspection run.
The electrical connections have to be installed completely and checked.

Attention !

Do not bridge over safety devices and door contacts!

Door contacts may be bridged over for trouble shooting only with plug
P4T on TCB!

2First Inspection Run (without Encoder)

2.1Checking of voltages
1. Switch the unit to ERO-operation and CHCS and DDO (if possible)
2. Switch on the main switch
3. Check the power supplies on TRF1 according to the wiring diagram.
4. Connect the Service Tool (SVT) to MCB_II (P6)
5. After switching on, the DR (Drive Ready) -signal on the MCB_II must be active,
(Checking by SVT), it indicates the readiness of the inverter (at MS300 and MCS310
OP-relay will energize).
6. It must be checked if the following inputs of the MCB_II have the correct voltage of
24VDC
P3.2 (24V - output)
P4.7 (/1LS - signal)
P4.8 (/2LS - signal)
P3.1 (DBD - signal) in each case to P3.3 (HL2)

2.2Input Signals Check on the MCB_II using the SVT

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With <Module> <1> <2> <GO ON> check input signal DBD.

2.3Fundamental Parameter Set up

By setting of standard values signigficant parameters are adjusted for starting up.
Activated by pressing <Module> <3> <6> <ENTER> on Service Tool.
For runs in INS or ERO mode the following ”Contract Parameters” (SVT key sequence:
<Module> <3> <1> <GO ON> have to be set to get the required basic behaviour:

CON SPE: Defined contract speed of the unit.

Example: the contract speed is 1,60m/s Þ set Con Spe = 160
CON Nmot: Required motor r.p.m. to reach contract speed
Example: the contract speed is reached at 1460 rpm
Þ set Con Nmot = 1460
Note!
Con Nmot can vary from Mot Nnom.
MOT Fnom: Nominal or Operational Frequency of the Motor
Example:
for the common 50Hz motor Þ set NOM FREQ = 500 [0,1Hz]
for the max. frequency 60Hz Þ set NOM FREQ = 600 [0,1Hz]
for the min. frequency 35 Hz Þ set NOM FREQ = 350 [0,1Hz]
Only for some applications with reduced frequency:
the parameter NOM FREQ is used as operational frequency of the
motor to get the required contract speed.

Attention!
In this case the motor has to be driven with a reduced frequency to get the required
contract speed, the parameter MOT Fnom has to be set to the according value,
otherwise it is possible that the car runs with overspeed and the safety gear can
apply.
MOT Nnom: Synchronous Speed of the motor at nominal frequency
Example: for the frequency 50Hz and 2 pairs of poles
Þ set N SYN MOTOR = 1500 [rpm]
for the frequency 50Hz and 3 pairs of poles
Þ set N SYN MOTOR = 1000 [rpm]
for the frequency 60Hz and 3 pairs of poles
Þ set N SYN MOTOR = 1200 [rpm]
ENCODER PULSES: Number of Speed Encoder pulses per trace.
Example: for an encoder with 1024 pulses per revolution
Þ set ENCODER PULSES = 1024
Application of several encoders are possible, see chapter 3.2
Adjustment of Speed Encoder
ENCODER TRACES: Number of traces of the Speed Encoder
Example: for One trace encoder Þ set ENCODER TRACES = 1
for Two trace encoder Þ set ENCODER TRACES = 2
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2LV: Parameter to select one or two sensor application

Example: if using only 1LV Þ set 2LV avail = 0
if using 1LV and 2LV Þ set 2LV avail = 1
DDP: DDP time (is set of default value 20s),
has to be increased according nominal speed and rise if required
CONTR TYPE: Controller Signal Operation Mode
For MS/NE300 or MCS310 Þ set CONTR TYPE = 0
For MCS220(M) w/o coded interface Þ set CONTR TYPE = 1
For MCS220(M) with coded interface (V1...V4, DS1...DS5)
Þ set CONTR TYPE = 2
For MCS 220(M) with Learn Run Þ set CONTR TYPE = 4
TOP FLOOR: Top position
Example: for a unit with 8 floors Þ set TOP FLOOR = 7
FLOORS IN 1LS: Number of floors in 1LS,
Example: For one floor within the range of 1LS
Þ set FLOORS IN 1LS = 1
BrakeSW type: Type of brake switch checking
Example: no brake switch checking Þ set BrakeSW type = 0
Make&break contacts with additional SW contact
Þ set BrakeSW type = 2
Remark:
An inspection run without encoder is further possible if the number of impulses (ENCODER
PULSES) is set to Zero.

2.4Check of Direction
After setting of contract parameters you should check the run direction with the ERO-Box.
For INS- or ERO- operation the MCB_II needs the input signals UIB or DIB (<M> <1> <2>
<GO ON>).
The main contactors SW and BR have to be activated. The activation is done by the MCB II
in connection with UP- or DOWN- signals if the safety chain is closed. In the same time the
DBD-input will be inactive.
With the Service Tool the status of the drive can be controlled (<M> <1> <1> <GO ON>).
By pushing of UIB- or DIB-buttons the motor will start.
If the run direction is not the same as the wanted direction, then two conductors of the
motor cable have to be exchanged.
You must check if the drive reduces speed to creep speed when the cabine reaches the
switch 1LS or 2LS (only by MCS220).
If the car does not move the error can be detected by means of status display.
If Shut Down (SHT DWN) is displayed the reason can be found out by means of Error
logging (ErrLog) (<M> <2> <2> <1> <GO ON>).
By off and on switching of the main switch in decided cases of Shut Down the blocking can
be cancelled.
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3Prepare first Normal Run

3.1Adjustment of magnets
Magnets with a length of 170 to 250 mm can be used. At shorter landings you have to
consider that the distance between door zones must be at least 180 mm. Otherwise the
door zones can not be separareted with normal speed.
3.1.11-Track Construction
Suppositions: the magnets have the same lengt in each landing
Connection (MCB II): 1LV to 4P3
2LV to 4P4 (only at 2LV)

*IPU

*SLU
STD
STD up direction
up direction
(Short
UIS distance)
1LV Door zone
2LV
STD down
DIS direction
(Short
distance STD
down direction
*SLD

*IPD

· At controllers with Learn run no IPU/IPD- and SLU/SLD-signals are required.

Speed [m/s] Stop distance (STD) 1/2LS distance Door zone [mm] Door zone [mm]
[mm] [mm] (only 1LV) (1LV + 2LV)
0,50 650 same as
0,63 800 magnet length
0,80 960 STD - 50mm same as minus
1,00 1200 magnet length distance
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1,20 1400 between

1,60 is generated 1800 1LV and 2LV

In controllers with learn run, the stopping distance is generated by the MCB II software.

3.1.2Position reference system (PRS2)

Requirements: Floating tape and sensor head have to mounted according instructions and
the magnets are to be located at the same level in each landing (to related
to the hoistway door sill)
Length of magnet: - 250mm (1LV, 2LV)
- as stop distance (1LS, 2LS)
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Tape SAC

LV1/LV2/DZI

Floor level

2LS
Sensor
unit DZ
SAC only
12 2L I SA for
mm S C REM
LV
1
30mm
150mm Floor level

LV1/LV2/DZI LV2
1LS

SAC

LV1/LV2/DZI
lacquered
Floor level Southern
magnet
non
lacquered Northern magnet
1LS

Note:
Following problem can occur if a correction run starts in down direction near by 1LS (or 2LS
for up. Then the drive decelerates in 1LS to creep speed and creeps the whole distance to
the door zone. If now the distance between 2LV and 1LV & 2LV is too long, relay LVC drops
off and disables relay LV2 to pull in. The door bypass circuit is opened. With it the door
zone was not detected and the car runs to the limit switch (7LS).
The solution is, the magnets 1LV and 2LV have to be as narrow so far as the failure does
not occur. In the terminals that distance have not to be longer than 35mm.
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3.2Adjustment of Speed Encoder

Several encoders can be connected:
a) one-chanel encoder
b) two-chanel encoder
The SCLK- inputs are provided for 1-chanel encoder with max. 350 pulses / rotation.
CLKA and CLKB are provided for connection of 2-channel encoders with max. 2 x 1024
pulses / rotation.
If encoders are used with shielded wiring the screen has to be connected on both sides, i.e.
on the connector P9.1 on the MCB II respectivelly on PE from motor.

MCB II - Inputs maximum Input current

P5.5 EGND
P5.6 +15V (max. 100 mA)
P5.1/2 SCLK1 or 2 for 1-channel encoder* 10 mA
P5.3 CLKA for 2-channel encoder 10 mA
P5.4 CLKB for 2-channel encoder 10 mA
P9.1 ESCR Screen

* SCLK1 = slow clock for push pull input

SCLK2 = for TAA633B1 (former version GO177CK1)

Set Contract parameters ENCODER PULSES and ENCODER TRACES according used
encoder:
ENCODER PULSES = 120, if the marks on the brake drum are 120 or according
declaration on encoder type plate
(usually at one channel encoder)
= 1024, according declaration on encoder type plate
(usually at two channel encoder)
ENCODER TRACES = 1, if one channel encoder is used
Example: if TAA633B1 (GO177CK1) is used;
Þ set ENCODER PULSES = 120*,
Þ set ENCODER TRACES = 1
* If encoder TAA633B1 is used check the number of marks on the brake drum (on 13VTR,
160VAT machines refer to application area on motor plate).
The number of marks can be determined as follows:
Switch on ERO mode.
Set a mark on the hand wheel and switch off the main switch (OCB) and on again.
Choose the SVT menu PVT (<M> <2> <6>). The counter is reseted and stays at zero.
Lift the brake for one rotation (hand wheel) and check the counter in the PVT menu.
Divide the value by 2 and you will get the value for the parameter ENCODER PULSES.
Example: for a unit with a PVT counter of 246 Þ set ENCODER PULSES = 123
ENCODER TRACES = 2, if two channel encoder is used
Example: if GBA633A1 is used;
Þ set ENCODER PULSES = 1024
Þ set ENCODER TRACES = 2
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Remark!
If an encoder with 2 x 120 pulses is changed by an encoder with 2 x 1024 pulses, the
adjustable delays of hoistway signals (1/2LV, 1/2LS) are decreased at slower contract
speeds.

CON SPE LV_DLY [mm] LS_DLY [mm]

[0.01m/s]
(1500 rpm) maximal maximal
2 x 120 2 x 1024 2 x 120 2 x 1024
63 250 184 600 307
50 250 146 600 244
40 250 177 600 195
25 250 73 600 122

If the delay values are too high, the acceptance of these values is refused by software.
In that case the length of LS magnet has to be decreased.

Test inspection run with encoder!

(You can check the function of encoder in the PVT menu (<M> <2> <6>)).

3.3Learn run
Before the unit runs in Normal operation a Learn run has to be performed. Normal runs are
not possible without previous Learn run. A repeatition of the Learn run is also necessary if a
door zone magnet was removed or if the parameter CON SPE was changed. Before
starting the Learn run, the parameters CON SPE, CON Nmot, MOT Fnom, MOT Nnom,
CONTR TYPE, TOP FLOOR and FLOORS in 1LS (<M> <3> <1> <GO ON>) have to be
adjusted.
Check the 1LS distance before starting the learn run!
Attention !
The cabine must be empty during Learn run !
The start position of cabine in the hoistway has to be out of 1LS range and a door
zone.
To avoid trouble switch off the door drive (e.g. DDO) and cut off the entering of hall calls
(CHCS).
The Learn run is started with Service Tool <M> <4> <1>.
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Wait for NORMAL switch to ”NORMAL” on ERO-Box

Switch on
switch to ”ERO” on ERO-Box
Inspection

To start Learn
press <ENTER> on Service Tool
Run press ENTER

Switch back
switch to ”NORMAL” on ERO-Box
to NORMAL

After correction run the car runs with

Learn active nn about 10 cm/s from bottom to top
xxxxxxxxx landing.
nn: floor counter
xxxxxx: information about
events
Learn finished Learn run finished sucessfully
sucessfully Drive is ready for normal run

Learn abort ! Learn run was aborted with an error!

xxxxxxxx Find the reason for that and repeat
the learn run!

4Final adjustment of Position Reference

4.1Speed Profile

4.1.1Contract parameters (<M> <3> <1> <GOON>)

The following parameters normally can be set to default values. Only in some cases it is
necessary to adjust these parameters.

ACC PRECTR: Frequency precontrol to compensate the torque of inertia.

After 10 normal runs, enter the value of SVT-display (right,above).
If the value impossible round down!
SLIP LOAD: Slip, during full load in up direction.
Run with empty car in down direction or with full load in up direction
and enter the value of SVT-display (right, above)
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Is the value impossible round up !

Negative values for the Slip_Load are only displayed in case
of motoric load. If negative values appear for both directions,
there might be something wrong in the parameter setup for
the encoder (ENCODER PULSES or
N SYN MOTOR = Nom Freq x 60 / pairs of poles)
4.1.2Profile parameter <M> <3> <2> <GO ON>
The drive parameter NOM SPE is adjusted automatically by setting the CON SPE, change
only if it is necessary, e.g. to reduce the normal run speed or to enable short landing.

INS SPE [0.01m/s]: Speed at Inspection run (max. 0,63m/s)

Example: for an Inspection run with 0,5m/s
Þ set INS SPE = 50 [0,01m/s]
NOM SPE [0.01m/s]: Nominal Speed at constant run (max. 1,75m/s)
The NOM SPE is automatically adjusted by setting of CON SPE.
This parameter can be used to reduce the nominal speed.
Example: for a unit that should run 1,5m/s, but is designed for
nominal speed of 1,6m/s, the parameter CON SPE is adjusted to
160 [0,01m/s]. With it NOM SPE is set to 160 [0,01m/s]. Now you
can reduce the nominal speed to 150 [0,01m/s]
Þ set NOM SPE = 150 [0,01m/s]
SHR SPE [0,01m/s]: Speed at floor to floor run over a short landing distance
At controller without Learn run the Short landing distance and
the short run speed depend on the contract speed (see table
below)

SHR SPE Short landing distance (dis- CON SPE Distance between SLU/SLD
[m/s] tance between door zones) [m/s] and 1/2LV sensors
[m] [m]
0,40 0,8 1,00 0,35
0,30 0,7 0,80 0,30
0,25 0,6 0,63 0,25

At controllers with learn run the short distance speed is adjusted by the software.
REL SPE [0.01m/s]: Releveling speed
The Releveling speed should be 2...3 [0.01m/s]
CRE SPE [0.01m/s]: Creep speed
The creep speed should be 6...8 [0.01m/s]
ACC [0.01m/s²]: Acceleration rate
Example:
Is NOM SPE = 100 [0.01m/s] Þ set ACC = 100 [0.01m/s²]
Is NOM SPE = 90 [0.01m/s] Þ set ACC = 80 [0.01m/s²]
Is NOM SPE = 80 [0.01m/s] Þ set ACC = 60 [0.01m/s²]
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The Acceleration rate can be decreased unrelated of the nominal

speed if required.
Notice!
The maximal Acceleration rate should not exceed 120 [0.01m/s²].
DEC [0.01m/s²]: Deceleration rate
Example:
Is NOM SPE = 100 [0.01m/s] Þ set DEC = 100 [0.01m/s²]
Analogous to ACC.
JERK [0.01m/s³]: Jerk, Acceleration changing
The Jerk should be adjusted in ratio to nominal speed.
Example:
Is NOM SPE = 100 [0.01m/s] Þ set JERK = 133 [0.01m/s³]
Is NOM SPE = 90 [0.01m/s] Þ set JERK = 100 [0.01m/s³]
Is NOM SPE = 80 [0.01m/s] Þ set JERK = 100 [0.01m/s³]

4.2Vane parameters <M> <3> <3> <GO ON>

For the following normal runs the input signals NOR (NORMAL) UIB, DIB and U or D and T
for MCS 310 and MS 300 or V1-V4 for OTIS 2000 will be used.
Before adjusting the vane parameters (hoistway signals), a trip through hoistway signals
should be done (inspection run).
The switching of IPU/IPD, (SLU, SLD), LV, (1LV, 2LV) 1LS and 2LS switches should be
watched with the Service Tool (<M> <1> <2> <GO ON>).
After this test the vane-parameters should be adjusted (hoistway variable).
The next step is to search a ”adjusted floor” in the middle of the hoistway.
4.2.1LV DLY UP and LV DLY DOWN (Adjustment of floor level)
Check the floor level in down- and up-direction.
Stopping failures will be removed by chanching the parameters LV DLY UP [mm] (Stopping
failure direction up) and LV DLY DOWN [mm] (Stopping failure direction down).
If the car is stopping to early (before level), this value has to be higher (+ the stopping
failure in mm).
If the car stopping to late (after level), this valu has to be lower (- stopping failure in mm).
If the magnets are adjusted in the same manner at each floor, the car should stop correctly
in each landing, otherwise the magnets should be adjusted accordingly.
4.2.2IPU/ IPD DLY (Adjustment of creep time)
(only at controllers without Learn run)
The creep time should be 300 ms - 500 ms.
Adjustment is done by changing the parameters IPU DLY and IPD DLY.
If the creep time is too long, these values should be increased.
The minimum value for IPU-DLY and IPD-DLY depends on the contract speed of the car.
The creep time of the last run is displayed in SVT display (right, above) unit in 10 ms steps.
If the deceleration is started by limit switches in the terminal landings, ”1LS/2LS” is
displayed in the SVT display (right above).
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Attention !
Each IPU/IPD-signal must be active for longer than 150 ms
(else ”MLS: /T <> IP ”would be registered) !

Speed min. value

0,5 m/sec 75 mm
0,63 m/sec 95 mm
0,8 m/sec 120 mm
1,0 m/sec 150 mm

4.2.3SLU/SLD DLY (Adjustment of Creep time)

(only at controllers without learn run)
SLU/SLD sensors can use the same track as LV- and IP- sensors. All signals are triggered
by the positiv edge.
The adjustment is done by changing of parameter SLU DLY or SLD DLY for short landing
distances in the same way as IPU/IPD DLY.
The creep time is adjusted to 300ms up to 500ms.
Remark!
In case of more then one short landings the shortest distance has to choose.
4.2.41LS, 2LS (Adjustment of deceleration limit switch)
1LS DLY and 2LS DLY have to be adjusted in the way that in the top and bottom landing
the deceleration will be activated by the IPU- or IPD-signal.
Is the deceleration started by the limit switches in the terminal landings, a ”>” is displayed in
the SVT display.
Increase the value for 1LS DLY or 2LS DLY, until the ”>” character, after a new run, doesn’t
occure.
The value should not be too large for a sure deceleration by correction run.
1LS- and 2LS DLY have to be increase, till the failure ”MLS: 1LS INI DEC” in the bottom
landing and ”MLS: 2LS INI DEC” in the top landing, while stopping, is removed.
Only at correction runs this failure is allowed and can be read in the event logging,
ErrLog = 2, (<M> <2> <2> <1> <GO ON>).
Before the adjustment of 1LS DLY and 2LS DLY take care that the creep time T_creep is
adjusted to the optimal creep time (640ms).
Hint:
T_creep has influence to the 1/2 DLY.
4.2.5T_creep
The parameter T_creep should adjusted like that the actual creep time is about 0,5 ... 0,8s
(500 ... 800ms). You can check the creep time in the SVT Menu DATALOG (<M> <2> <5>).

4.3Event logging
Conditions in the event logging does not generate automatically a shut down of the unit.
The explanation of the events are described in the chapter ”Service Tool User Guide”.
The unit should be switched off and on (main switch) to reset the event logging counter.
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If requested you can find the saved events in the menu ”Saved” (<M> <2> <2> <2>).
At following test runs no failure should be registered in the event logging.
Exception: DRV: SPEED MSMT” and ”SYS: Calc Time”.

4.4Parameter storage
Note adjusted parameter and lie down them in the controller.
Store the parameter setup with <M> <3> <7> in the EEPROM.
Do not choose the Default-values, otherwise the adjusted contract-specific parameters will
be lost.
It is helpful to store adjusted parameter in the controller cabinet, because with that the drive
can be readjusted rapidly after change of EPROM or MCB_II and setting of default values.

5Fine Adjustment

5.1Starting Jerk Reduction without load weighing

Cause Hint Additional Effect
a) Too less starting torque at a) Increase parameter Too much increasement
motoric load (”Rollback”) Ustart [0,1 % Un] could implicate too much pre-
(U/f-characteristic at f = 0) torque at generatoric load.
b) Too less pre-torque at b) Increase parameter In some cases also vibrations
motoric load (”Rollback”) PRET FREQU [0,1 Hz] at creep speed
(pre-torque)
Too much pre-torque at gen- Decrease parameter Too much increasement
eratoric load (”Starting Jerk”) PRET SLOP (4...6) could implicate too much pre-
torque at motoric load
Too much starting torque at Decrease parameter Too much decreasement
generatoric load (”Starting Ustart [0,1 % Un] could implicate too much pre-
Jerk”) (U/f-characteristic at f = 0) torque at motoric load
Brake opens too early Increase parameter
Lft Bk Dly [10 ms]]
(Lift brake delay)
Brake opens too late Decrease parameter
Lft Bk Dly [10 ms]]
(Lift brake delay)
Friction too high Check the car guides (Oil on
(”Starting Jerk”) the guide rails, Distance be-
tween guides (DBG) at floor
level)

5.2Adjustment of Load weighing system

The elevator is equipped with load weighing. That can be used to optimize the start jerk.
The load switches are connected to P4.5 and P4.6 and should be adjusted to 25% i.e. 65%
of full load.
The adjustment can be done with empty car in inspection mode :
 FIELD COMPONENT MANUAL Part: 4 - AA3
OTIS No.:
Vintage: 01 / 1
Central & East European Area
Start up Routine Page: 1 / 16
FOD BERLIN OVF20 Date: 29-Jun-1999

· Run the car into top position.

· Set parameter PREMAG PER to 100.
· Start the car in down direction. Adjust PRET FREQ so that the car does not move during
pre-magnetization. Adjust NEG PRET as low as possible.
· Run car into bottom position.
· Start car in up direction. Adjust NEG PRET so that the car does not move during pre-
magnetization. Adjust NEG PRET as low as possible.
· Set PREMAG PER to the old value.
· Set PRET SLOPE to 2 up to 4 (at 13 VTR to 2).

If the start jerk is worse in up direction than in down direction (empty car), then increase pa-
rameter Ustart. Too much increasement could implicate vibrations at creep speed.

The adjustment is finished and the start jerk one person up is reduced significantly.