Inovance MD500

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81
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6
6 Troubleshooting and Solutions
Fault Name
Operating
Panel
Display
Cause Possible Solution
Load loss
● The output current of AC
drive is smaller than F9-64
(load loss detection level).
● Check whether load is disconnected or the
setting of F9-64 and F9-65 (load lost detection
time) satises actual running condition.
PID feedback lost
during running
Feedback loss
● PID feedback is smaller
than the setting value of FA-
26 (detection level of PID
feedback loss).
● Check PID feedback or set FA-26 properly.
Pulse-by-pulse
current limit fault
● Load is too heavy or locked-
rotor occurs on motor.
● Reduce load or check motor and mechanical
conditions.
● The AC drive power class is
small.
● Replace a drive of larger power class.
Motor switchover
fault during
running
Motor winding is
damaged.
● Motor switchover via terminal
during drive running of the AC
drive.
● Perform motor switchover after the AC drive
stops.
Speed error
● Encoder parameters are set
improperly.
● Set encoder parameters properly.
● Motor auto-tuning is not
performed.
● Perform motor auto-tuning.
● F9-69 (detection level of
speed error) and F9-70
(detection time of speed
error) are set incorrectly.
● Set F9-69 and F9-70 correctly based on actual
condition.
Motor overspeed
Problem
● Encoder parameters are set
improperly.
● Set encoder parameters properly.
● Motor auto-tuning is not
performed.
● Perform motor auto-tuning.
● F9-67 (Overspeed detection
level) and F9-68 (Overspeed
detection time) are set
incorrectly.
● F9-67 and F9-68 correctly based on actual
condition.
Motor
overtemperature
● Cable connection of
temperature sensor becomes
loose
● Check cable connection of temperature sensor.
● The motor temperature is too
high.
● Decrease carrier frequency or take other
measures to cool the motor.
Braking unit
overload
● Resistance of braking resistor
is too small.
● Replace a braking resistor of larger resistance.
Short-circuit of
braking circuit
● Braking module is abnormal. ● Contact the agent or Inovance.