Optimization CT MODBUS RTU Technical Data
452
E300 Design Guide
Issue Number: 1
Elevator fails to reach
contract speed
Drive operating in current limit
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
Motor rated speed “slip”
incorrect Open loop vector,
RFC-A)
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)
Output motor voltage limited
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
)
PM motor operating in RFC-S
reaching flux weakening
region
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 during
change in speed
Speed control loop
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.
Acoustic noise from
motor/ brake
arrangement during
start / stop
Current limit ramp time
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
)
Reported fault
Root cause
Recommended actions
Vibration on brake
release
Speed control loop
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
Start position lock
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
Position feedback Closed loop
operation)
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.
Reported fault
Root cause
Recommended actions
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