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Troubleshooting
140
Name
Description
Possible Causes & Corrective Action
Motor Ovrload
Fault
[F48]
or
Motor Ovrload
Alarm
[F74]
The motor had exceeded the user
defined motor overload curve.
Note: fault or alarm setting dependant
on setting of MOTOR OVRLD SEL
(C1) parameter.
Verify Overload Curve Parameters
Check both OVLD START LEVEL (A5)
and OVLD TIME OUT (A5) parameters
.
Excessive Field Weakening
Decrease FLUX WKN FACTOR (A1)
parameter
Decrease both MTR TORQUE LIMIT
(A1) and REGEN TORQ LIMIT (A1)
parameters
Watch for the “
Hit Torque Limit” alarm
message
, if message appears the
torque limits or the flux weakening factor
parameters were decreased too much.
Accurate Motor Parameters
Verify motor nameplate values are
entered correctly
Complete Adaptive Tune and Inertia
procedure (
As a last step, calculate motor
parameters from motor’s equivalent
circuit.
Excessive Current Draw
Decrease accel/decel rate
Is elevator car being held in position?
(i.e. mechanical brake not releasing)
Mechanical brake may not have properly
released
Encoder Problem
Check encoder coupling: align or replace
Encoder failure (replace encoder)
Check encoder count parameter
ENCODER PULSES (A1)
Motor Problem
Check for motor failure
Mspd Tmr Flt
[F57]
This fault is declared if at least two
MLT-SPD TO DLY x (C1) parameters
are defined to the same multi-step
speed command.
Check Parameters Settings:
Check MLT-SPD TO DLY 1 (C1)
parameter for setting
Check MLT-SPD TO DLY 2 (C1)
parameter for setting
Check MLT-SPD TO DLY 3 (C1)
parameter for setting
Check MLT-SPD TO DLY 4 (C1)
parameter for setting