Rockwell Automation Publication D2-3518-4 - January 2020 207
Troubleshooting the Drive Chapter 10
Invtr Unk IO Brd 123 The I/O board is of a type that is unknown to the inverter
firmware. If fault is cleared, analog inputs and outputs are
unusable.
1. Verify the I/O Board ID Voltage (354) is correct for this type of I/O board.
2. If ID voltage is not correct, then replace I/O board. If ID Voltage still isn’t
correct, then replace control board.
3. If ID voltage is correct, verify that current inverter application firmware
version can use this type of I/O board. If not, then update inverter
application firmware.
IR Volts Range 77 The drive autotuning default is Calculate, and the value
calculated for IR Drop Volts is not in the range of acceptable
values.
Re-enter motor nameplate data.
IXo Voltage-
Range
87 Ixo voltage calculated from motor nameplate data is too high. 1. If Ixo calculation is not needed, disable it by clearing bit 2 of
Compensation (inverter parameter 56), then clear fault.
2. If Ixo calculation is needed, re-enter motor nameplate data, and, if
necessary, repeat Autotune (inverter 61).
Line Freq Lost 228 Line frequency not in the range of 47...63 Hz. 1. Verify proper input voltage and frequency.
2. Verify connections to I/O board.
3. If fault persists, replace I/O board.
Low DC Bus 223 The DC bus voltage is too low. Verify proper input voltage.
Motor I Imbalance 37 The motor current imbalance displayed in inverter Imbalance
Count (221) has exceeded inverter Imbalance Limit (49) for
time configured in inverter Imbalance Time (50).
Clear fault.
Motor Overload 7
Internal electronic overload trip.
Enable/disable with inverter Fault Config 1 (238).
An excessive motor load exists. Reduce load so drive output current does
not exceed the current set by Motor OL Amps (48).
Not at Voltage 237 The rectifier did not regulate to the desired voltage within the
defined time.
1. Verify that rectifier is currently synchronized to the AC line.
2. Check all fuses and cabinet wiring.
3. Replace I/O board.
4. Replace control board and/or power board.
NTC Demux Fail 30 Control board cannot read temperature information from
inverter half of power board.
1. Clear faults.
2. If fault persists, verify connections to power board.
3. If fault still persists, replace power board.
OverSpeed Limit 25 Functions such as slip compensation or bus regulation have
attempted to add an output frequency adjustment greater
than that programmed in inverter Overspeed Limit (83).
Remove excessive load or overhauling conditions or increase inverter
Overspeed Limit (83).
OverVoltage 5 DC bus voltage exceeded maximum value. Monitor the AC line for high line voltage or transient conditions. Bus
overvoltage can also be caused by motor regeneration. Extend the decel
time.
Parameter Chksum 100 The calculated checksum does not match the stored checksum
for inverter parameter values read from the non-volatile
memory on the control board.
This fault can be cleared by writing a nonzero value to inverter
Reset To Defaults parameter (197).
1. Restore inverter defaults using inverter Reset To Defaults parameter
(197).
2. Reload user set if used, or reprogram inverter parameters.
3. If fault recurs, replace control board.
Params Defaulted 48 The drive was commanded to write default values to all
inverter parameters.
1. Clear the fault or cycle power to the drive.
2. Program the inverter parameters as needed.
Phase U to Grnd 38 A phase-to-ground fault has been detected between the drive
and motor in this phase.
1. Check the wiring between the drive and motor.
2. Check motor for grounded phase.
Phase V to Grnd 39
Phase W to Grnd 40
Ph
ase UV Short 41 Excessive current has been detected between these two
output terminals.
1. Check the motor and drive output terminal wiring for a shorted
condition.
Phase VW Short 42
Phase UW Short 43
Table 22 - Fault Descriptions and Corrective Actions (Frame 4) (Continued)
Fault
No.
Type
Description Action
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