IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 198
MNT
Maintenance Reqd
Maintenance Required Alert.
Running time has
exceeded C12-05
Reset timer by H01-0x = 5A or
depress Mode/Service key three
times and enter within 2 seconds.
X
OC
Over Current
Over Current Detected.
Output current exceeds
200% of VFD rated output current.
1. Check for a phase-to-phase
short in the motor or wiring
using a megger.
2. Extend the acceleration/
deceleration time.
3. Check torque limit setting.
4.
X
OH
Heatsnk Over temp
Overheat Pre-Alarm.
Heatsink is overheating.
The temperature of the VFD heatsink exceeded
the setting in L08-02.
1. The VFD cooling fan has
stopped.
2. Reduce the ambient
temperature.
X
X
OH1
Heatsink MaxTemp
Overheat Fault.
There are two situations that
result in an overheat fault. The first occurs when
the measured heat sink exceeded 105°C. The
second is a result of a fault in the internal 24 VDC
cooling fan.
1. Ensure the heat sink cooling
fans are functioning.
2. Ensure the heat sink is free
from dirt and debris.
3. Ensure the VFD’s ambient
temperature is within
specification.
4. Replace the 24 VDC fan.
5. Replace the heat sink
thermistor(s).
X
OH2
Overheat 2
Overheat Alarm.
Signal is input by external
terminal. H01-0x=39
X
OH3
Motor Overheat 1
Motor Overheating 1.
Thermistor analog input
detected motor overheating. See L01-03. Alarm
defined by L01-03.
1. Check the motor rated current
value, E02-01.
2. Increase cycle time or reduce
the load.
X
OH4
Motor Overheat 2
Motor Overheating 2.
Thermistor analog input
detected motor overheating. See L01-04.
X
OL1
Motor Overloaded
Motor Overload Fault.
VFD output exceeded the
motor overload level.
Alarm or fault defined by L06-08.
1. Check setting of motor full load
Amps (E02-01).
2. Reduce the load.
X
X
OL2
VFD Overloaded
VFD Overload Fault.
VFD output exceeded the
overload level.
1. Reduce the load.
2. Extend the acceleration time.
X
X
OPR
Oper Disconnect
Keypad Disconnected.
The keypad is removed
while the VFD is running, and the run command
was initiated via the keypad RUN key.
1. Secure the keypad.
2. Verify O02-06 setting.
X
X
OS
Over Speed
Overspeed Fault.
The motor has exceeded the
programmed detection level and time. This is
typically caused by an overshoot condition due to
an over-responsive ASR loop. If the VFD is
programmed to flux vector “torque control” mode,
and no load is present, an overspeed fault will
typically occur.
Alarm or fault defined by F01-23.
1. Check the Automatic Speed
Regulator settings, D04 sub
group.
2. Check setting of F01-24,
F01-25.
3. Verify proper encoder PPR
setting, F01-01.
X
X
OT1
Overtorque Det 1
Overtorque Detection Level 1.
Defined by L06-02. Alarm or fault defined by L06-
01.
Check for proper programming for
L06-02 and L06-03.
X
X
Display
Description
Corrective Action
Fault Alarm