IMPULSE•T Instruction Manual – October 2015
6-6
EF2
External
Fault 2
External fault occurs on Terminal S2. 1. Check constant H1-02 for
proper programming.
2. Check the conditions for input
terminal S2 (U1-10).
XX
EF3
External
Fault 3
External fault occurs on Terminal S3. 1. Check constant H1-03 for
proper programming.
2. Check the conditions for input
terminal S3 (U-10).
XX
EF4
External
Fault 4
External fault occurs on Terminal S4. 1. Check constant H1-04 for
proper programming.
2. Check the conditions for input
terminal S4 (U1-10).
XX
EF5
External
Fault 5
External fault occurs on Terminal S5. 1. Check constant H1-05 for
proper programming.
2. Check the condition for input
terminal S5 (U1-10).
XX
ERR
EEPROM
R/W Err
EEPROM Read/Write Error. 1. Cycle power.
2. Replace the drive.
X
LF
Output Phase Loss
An open phase occurred at the inverter
output.
1. Check for broken wires in output
cable.
2. Check for open winding in the
motor.
3. Check for loose terminals.
X
OC
Over Current
Output current exceeds 200% of inverter
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.
X
OH (flashing)
Heatsnk Over temp
Overheat Pre-Alarm. Heatsink is
overheating. The temperature of the
inverters heatsink has exceeded the
internal detection level.
1. The inverter cooling fan has
stopped.
2. Reduce the ambient
temperature.
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 24VDC cooling
fan.
1. Ensure that the heat sink
cooling fans are functioning.
2. Ensure that the heat sink is free
from dirt and debris.
3. Ensure that the inverter’s
ambient temperature is within
specification.
4. Replace the drive.
X
OL1
Motor Overloaded
Motor Overload Fault. Inverter output
exceeded the motor overload level.
1. Ensure drive is programmed
with proper motor full load Amps
(E2-01).
2. Reduce the load.
X
OL2
INV Overload
Inverter Overload Fault. Inverter output
exceeded the inverter overload level.
1. Reduce the load.
2. Extend the acceleration time.
X
Fault Code Fault or Indicator Name/Description Corrective Action
Fault
Alarm
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