YASKAWA E7LVD002 Technical Manual page 187

Digital
Operator Display
OV
DC Bus Overvoltage
DC Bus Overvolt
208-240VAC: Trip point is ≥ 400Vdc
(Flashing)
480VAC: Trip point is ≥ 800Vdc
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
UV2
Control Power Supply Undervoltage of the
CTL PS Undervolt
control circuit when running
Soft Charge Circuit Fault
UV3
The pre-charge contactor opened while the
MC Answerback
Drive was running.
Table 6.4 Alarm Displays and Processing (Continued)
Description
Diagnostic & Troubleshooting 6 - 15
Cause
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.
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.
- - -
- - -
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.