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Digital
Operator Display
OV
DC Bus Overvoltage
208-240Vac: Trip point is ≥ 400Vdc
DC Bus Overvolt
480Vac: Trip point is ≥ 800Vdc
(Flashing)
OVRD
Emergency Override
Emergcy
Emergency Override is active
Override
PRHT
Motor Preheating
Motor Preheating
Motor is preheating
DC Bus Undervoltage
UV
The DC bus voltage is ≤ L2-05
DC Bus Undervolt
208-240Vac: Trip point is ≤ 190Vdc
(Flashing)
480Vac: Trip point is ≤ 380Vdc
Control Power Supply Undervoltage of the
UV2
control circuit when running
CTL PS Undervolt
Soft Charge Circuit Fault
UV3
The pre-charge contactor opened while the
MC Answerback
Drive was running
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Table 6.2 Alarm Displays and Processing
Description
High input voltage at R/L1,
S/L2 and T/L3
The deceleration time is set too
short
Power factor correction
capacitors are being used on the
input to the Drive
Forward or Reverse Emergency
Override input is closed
Motor Preheat 2 input is closed
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
External load connected pulling
down the Drive power supplies
Contacts on the soft charge
contactor are dirty and the soft
charge contactor does not
function mechanically
Diagnostic & Troubleshooting 6 - 11
Cause
Corrective Action
Check the input circuit and
reduce the input power to within
specifications
Extend the time in C1-02
Remove the power factor correc-
tion capacitors
When the Forward (H1-0X = 81)
or Reverse (H1-0X = 82) Emer-
gency Override multi-function
input is closed, the drive will run
at either the B1-14 reference (B1-
15 = 0) or the AUTO reference
(B1-15 = 1) and "OVRD Emer-
gency Override" will be dis-
played on the digital operator.
If the Drive Enable
6A) or Bypass Drive Enable (H1-
0X = 70) is programmed, the
emergency override function can
only be activated when the
Enable input is open. If the
Enable input is closed at any time
during emergency override, the
drive will stop.
Check the input circuit and
increase the input power to
within specifications
Extend the time in C1-01
Check the input voltage
Cycle power off and on to the
Drive
Repair or replace the Power PCB/
Gate Drive PCB
Cycle power off and on to the
Drive
Check the condition of the soft
charge contactor
(H1-0X =
- - -
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