62 Unidrive M400 Quick Start Guide
Issue Number: 8
Motor Too Hot
Output current overload timed
out (I
2
t)
trip indicates a motor thermal overload based on the
output current and motor thermal time constant. The
drive will trip on Motor Too Hot when the accumulator
gets to 100 %.
This can occur when:
• There is excessive mechanical load
• Ensure the load is not jammed / sticking
• Check the load on the motor has not changed
• Ensure the motor rated current is not zero
No power board
No power board
No communication between the power and control
boards.
OHt Brake
Braking IGBT over-temperature Braking IGBT over-temperature
OHt Control
Control stage over-temperature Control stage over-temperature
OHt dc bus
DC bus over temperature
DC bus component over temperature based on a
software thermal model.
OHt Inverter
Inverter over temperature based
on thermal model
IGBT junction over-temperature has been detected
based on a software thermal model.
OHt Power
Power stage over temperature
This trip indicates that a power stage over-temperature
has been detected.
OHt Rectifier
Rectifier over temperature
The OHt Rectifier trip indicates that a rectifier over-
temperature has been detected.
OI ac
Instantaneous output over
current detected
The instantaneous drive output current has
exceeded.The set limit.
Possible solutions:
•Increase acceleration/deceleration rate
• If seen during autotune reduce the voltage boost
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an
insulation tester
• Is the motor cable length within limits for the frame
size
• Reduce the values in the current loop gain
parameters
OI Brake
Braking IGBT over current
detected: short circuit protection
for the braking IGBT activated
Over current has been detected in braking IGBT or
braking IGBT protection has been activated.
Possible cause:
• Check brake resistor wiring
• Check braking resistor value is greater than or
equal to the minimum resistance value
• Check braking resistor insulation
Option Disable
Option module does not
acknowledge during drive mode
changeover
Option module did not acknowledge notifying the drive
that communications with the drive has been stopped
during the drive mode changeover within the allocated
time.
Out Phase Loss
Output phase loss detected Phase loss has been detected at the drive output.
Output phase s/c
Output phase short-circuit Over-current detected on drive output when enabled.
Over Speed
Motor frequency has exceeded
the over frequency threshold
Excessive motor speed (typically caused by mechanical
load driving the motor).
Trip code Condition Description
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