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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 261
Issue Number: 1
9.16 Troubleshooting and identifying faults
Reported fault Root cause Recommended actions
Unable to carry out
autotune, motor does
not rotate
Output motor contactors are
not closing during the static or
rotating autotune.
Verify where the output motor contactor control is being carried out, on the drive or the
Elevator controller. Select the autotune required and then ensure the output motor
contactors are closed.
• Refer to Menu B Motor for the motor contactor control and to select the autotune
Motor brake is not releasing
during rotating autotune
Verify where the brake control is being carried out, on the drive or the Elevator
controller. Select the autotune required, close the output motor contactors and then
release the motor brake.
• Refer to Menu D Brake for the brake control and Menu B Motor to select the
autotune.
Motor data incorrect
Verify motor nameplate data and parameter settings in parameters B01 through to B10.
Ensure correct operating mode is also selected for motor type, Induction motor or PM
motor
• Refer to Menu B Motor for motor parameters
Encoder data incorrect
Verify encoder data and parameter settings in parameters C01 through to C08 for
Closed loop operation. Note that for encoders with an additional comms interface e.g.
SC.EnDat an auto configuration option is available in parameter C02.
• Refer to Menu C Encoder for encoder parameters
For PM motors and operation in RFC-S an encoder phase angle test must be
completed before operation.
• Refer to Motor Autotune (B11)
Safe Torque Off (STO), Drive
enable not active
Check the enable signal is connected to control terminal 31 of the drive. The enable is
typically connected via the auxiliary contacts on the output motor contactors therefore
these must operate in order the drive to be enabled.
• Check motor contactor control in Menu F Hardware IO and the connections to
control terminal 31 of the drive.
Rotating autotune not possible
A rotating autotune cannot be carried out where there is either insufficient space for the
Elevator car to move in the Elevator shaft or load is present resulting in an unbalanced
system.
• In this condition a static autotune should be carried out refer to Motor Autotune
(B11).
Motor acoustic noise
on drive enable, motor
operation
Incorrect drive switching
frequency selected
Note the drive will modulate between a minimum (B14) and a maximum (B13) switching
frequency. An increase in the drive maximum switching frequency may result in an
output derating.
• Adjust the drive switching frequency in parameter B13 and B14.
Current control loop
The current control loop gains calculated from the autotune may be high for the given
motor and can therefore be manually adjusted or a current control loop filter
implemented. Note there is separate current control adjustment for (1) Start and (2)
Travel-Stop as default.
• Refer to Menu I Tuning to adjust the current control loop under both full load and no
load conditions.
Speed control loop
The speed control loop gains may need to be tuned for the given system. If the acoustic
noise is during standstill adjust Integral speed loop gain, if the noise is during operation
reduce the Proportional speed loop gain. Note there is separate speed control loop
gains for (1) Start, (2)Travel, Stop as default.
• Refer to Menu I Tuning to adjust the speed control loop 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
Wiring issue, induced noise on
position feedback
If there is induced noise on the position feedback from the motor to the drive due to the
wiring arrangement, screening and terminations this will result in unstable operation
and acoustic noise from the motor.
• Ensure good EMC practices are followed, if issue persists a position feedback filter
can be implemented with Drive Encoder Feedback Filter (C09)
Elevator system mechanical
issue
Check during operation that any acoustic noise present is not being generated as a
result of a mechanical fault with the Elevator system or is a fault with motor, gearbox
and/or couplings
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