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Digital
Operator Display
Input Phase Loss
PF
Drive input power supply has an open phase
Input Pha Loss
or has a large imbalance of input voltage
PUF
DC Bus Fuse
DC Bus Fuse Open
Detects if the DC bus fuse has opened
Dynamic Braking Resistor
RH
The protection of the dynamic braking
DynBrk Resistor
resistor based on setting of L8-01
RR
Dynamic Braking Transistor
DynBrk Transistr
The dynamic braking transistor is not oper-
ating properly.
DC Bus Undervoltage
UV1
The DC bus voltage is ≤ L2-05
DC Bus Undervolt
208-240Vac: Trip point is ≤ 190Vdc
480Vac: Trip point is ≤ 380Vdc
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Table 6.1 Fault Displays and Processing
Description
Open phase on input of the Drive Check the input voltage
Loose terminal screws at
R/L1, S/L2 or T/L3.
Momentary power loss occurred
Input voltage fluctuation too large
Parameter L8-06 value is set
incorrectly
Shorted output transistor(s) or
terminals
Overhauling load, extended
dynamic braking duty cycle,
defective dynamic braking
resistor
Shorted dynamic braking
transistor, high DC bus
voltage, defective dynamic
braking resistor
Low input voltage at R/L1,
S/L2 and T/L3
The acceleration time is set too
short
Voltage fluctuation of the input
power is too large
Diagnostic & Troubleshooting 6 - 7
Cause
Corrective Action
Tighten the terminal screws
Check the input voltage
Check the input voltage
Verify parameter L8-06 is set
correctly per the kVA tables on
pages C-2 and C-3. Adjust L8-06
according to your application.
The higher the value the less
sensitive it becomes.
CAUTION: Changing this
parameter from the factory
default setting may cause
Drive failure and void the
product warranty. (Consult
the factory for application
assistance).
Remove power from the Drive
Disconnect the motor
Perform the checks without
power in Table 6.6
Replace the shorted component(s)
Replace the defective fuse
Verify dynamic braking duty
cycle
Monitor DC bus voltage
Replace dynamic braking
resistor
Cycle power off and on to the
Drive
Replace defective dynamic
braking transistor or resistor
Monitor DC bus voltage
Check the input circuit and
increase the input power to within
specifications
Extend the time in C1-01
Check the input voltage
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