Unidrive M400 Quick Start Guide 63
Issue Number: 8
Over Volts
DC bus voltage has exceeded
the peak level or maximum
continuous level for 15 seconds
The Over Volts trip indicates that the DC bus voltage has
exceeded the maximum limit.
Possible solutions:
• Increase Deceleration Rate 1 (Pr 00.004)
• Decrease the braking resistor value (staying above
the minimum value).
• Check nominal AC supply level.
• Check for supply disturbances which could cause
the DC bus to rise.
• Check motor insulation using a insulation tester.
Phase Loss
Supply phase loss
The drive has detected an input phase loss or large
supply imbalance.
Power Board HF
Power board HF Power processor hardware fault.
Power Comms
Communication has been lost /
errors detected between power
control
No communications between power and control.
Power Data
Power system configuration data
error
Error in the configuration data stored in the power
system.
Power Down Save
Power down save error
Error has been detected in the power down save
parameters saved in non-volatile memory.
PSU
Internal power supply fault
One or more internal power supply rails are outside
limits or overloaded.
Resistance
Measured resistance has
exceeded the parameter range
The measured stator resistance during an autotune test
has exceeded the maximum possible value of Stator
Resistance. Refer to the Control User Guide.
Slot 1 Different
Option module in option slot 1
has changed
Option module in option slot 1 on the drive is a different
type to that installed when parameters were last saved
on the drive.
Slot 1 Error
Option module in option slot 1
has detected a fault
Option module in option slot 1 on the drive has detected
an error.
Slot 1 HF
Option module 1 hardware fault
Option module in option slot 1 on the drive has indicated
a hardware fault.
Slot 1 Not Fitted
Option module in option slot 1
has been removed
Option module in option slot 1 on the drive has been
removed since the last power up.
Slot 1 Watchdog
Option module watchdog
function service error
Option module installed in Slot 1 has started the option
watchdog function and then failed to service the
watchdog correctly.
Soft Start
Soft start relay failed to close,
soft start monitor failed
Soft start relay in the drive failed to close or the soft start
monitoring circuit has failed.
STO Error
No Safe Torque Off board
installed
STO board not installed.
Stored HF
Hardware trip has occurred
during last power down
Hardware trip (HF01 –HF19) has occurred and the drive
has been power cycled. Enter 1299 to xx.000 to clear
trip
Sub-array RAM
RAM allocation error
The Sub-array RAM trip indicates that an option module
derivative image has requested more parameter RAM
than is allowed.
Temp Feedback
Internal thermistor has failed Internal thermistor has failed.
Th Brake Res
Brake resistor over temperature
The Th Brake Res trip is initiated if the hardware based
braking resistor thermal monitoring is connected and the
resistor overheats.
Th Short Circuit
Motor thermistor short circuit
The Th Short Circuit trip indicates that the motor
thermistor connected to terminal 14 (digital input 5) on
the control connections, is short circuit or low impedance
(<50 Ω).
Trip code Condition Description
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