IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 204
LF2
Output Current
Imbalance
Output Current Imbalance. One or more of the
phases in the output current are lost.
1. Check for faulty wiring or poor/
loose connections on the
output side of the VFD.
2. Correct the wiring.
3. Measure the line-to-line
resistance for each motor
phase. Ensure all values
match.
4. Replace the motor.
X
LL1 (flashing)
Lower Limit 1 Err
Lower Limit 1—SLOW DOWN Indicator. Lower
Limit 1—SLOW DOWN is input (switch status is
changed).
1. May not require corrective
action.
2. Check the Limit Switches
position.
3. Check the Limit Switches
condition.
X
LL2 (flashing)
Lower Limit 2 Err
Lower Limit 2—STOP Indicator. Lower Limit 2—
STOP is input (switch status is changed).
1. May not require corrective
action.
2. Check the Limit Switches
position.
3. Check the Limit Switches
condition.
X
MNT
Maintenance Reqd
Maintenance Required Alert. Running time has
exceeded C12-05
1. 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. See Section 6.2 on page 210.
X
OH (flashing)
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.
XX
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 (flashing)
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
Code Fault/Alarm Description Corrective Action Fault Alarm
To Next Page
Loading...
Need help?
General
