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Safety
Product
Mechanical
information
information
installation
Reported fault
Drive operating in current limit
Elevator fails to reach
Motor rated speed "slip"
contract speed
incorrect Open loop vector,
RFC-A)
Output motor voltage limited
PM motor operating in RFC-S
reaching flux weakening
region
Overshoot during
Speed control loop
change in speed
Acoustic noise from
motor/ brake
Current limit ramp time
arrangement during
start / stop
Reported fault
Speed control loop
Vibration on brake
release
Start position lock
Position feedback Closed loop
operation)
452
Electrical
Getting
User Menu A Commissioning
installation
started
Root cause
If the motor is unable to reach the demanded speed check if the drive is operating in
current limit in Current Limit Reached (L15).
•
Check the motor parameters and symmetrical current limit are set-up correctly in
Menu B Motor
•
Check motor load in Total Output Current (J22)
•
Check for system mechanical issue, brake, safety gear, incorrect balance weights
•
Check drive size correct
•
Reduce acceleration, deceleration rates in Menu G Profile if issue is during
acceleration and/or deceleration
The motor is unable to reach the demanded speed due to a limitation in output torque
as a result of the incorrect rated speed "slip"
•
Manually adjust the rated speed to achieve the maximum torque in Torque
Producing Current (J24) Open loop)
•
Tune the rated speed to achieve the maximum torque using Motor Parameter
Adaptive Control (B25) RFC-A)
If the motor is unable to reach the contract speed due to insufficient voltage available
from the AC power supply, consider any voltage drops due to any additional AC power
supply input choke or drive output choke to the motor.
•
Refer to Output Voltage and Last Travel Maximum Output Voltage (J63)
The motor may be operating at its maximum speed / going into flux weakening.
•
Refer to Enable High Speed Mode (B28) and ensure Motor Rated Voltage (B03) is
set to the maximum rated voltage for the motor
Overshoot can occur during operation where there is a change in speed due to the
speed control loop proportional gain being to low. The speed control loop proportional
gain should be increased for the section, Start, Travel, Stop to minimise overshoot
under both full load and no load conditions
•
Refer to Menu I Tuning to adjust the speed loop P gain during the Start, Travel and
Stop.
•
Ensure good EMC practices are followed for the position feedback, induced noise
can limit the level of control loop gain which can be achieved.
During the stop and following brake apply the drive ramps the current limit down
releasing the load slowly onto the mechanical brake before disabling drive. If there is no
ramp or the ramp time is not correct some acoustic noise can be heard with some
motors and mechanical brakes.
•
Refer to Motor Torque Ramp Time (D02)
Root cause
If the speed loop integral gain is to high this can result in vibration during start and on
brake release, reduce the start speed loop I gain. The proportional gain can also be
reduced to improve stability, however low values can result in roll back on brake
release.
•
Refer to Menu I Tuning to adjust start speed loop gains under both full load and no
load conditions.
•
Ensure good EMC practices are followed for the position feedback, induced noise
can limit the level of control loop gain which can be achieved
If the Start lock P gain is to high prior to and during brake release this will result in
vibration during the start, to overcome vibration reduce the p gain, if this has little
effective the speed loop start i gain should also be reduced.
•
Refer to Menu I Tuning to adjust start lock for start under both full load and no load
conditions.
•
Ensure good EMC practices are followed for the position feedback, induced noise
can limit the level of control loop gain which can be achieved
Check the position feedback in Closed loop operation. Where induced noise is present
on the position feedback cabling this can result in unstable control.
•
Ensure good EMC practices are followed with regards to cable routing, screen and
terminations. Refer to Drive Encoder Feedback Filter (C09) which can also be used
to limit induced noise.
Advanced
Diagnostics
Optimization CT MODBUS RTU Technical Data
Parameters
Recommended actions
Recommended actions
E300 Design Guide
Issue Number: 1
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