Chapter 8: Troubleshooting
Firmware – S2011 and S3012
Revision: 1 (9/98) 67 © Saftronics, Inc.
Table 20 Fault Diagnosis and Corrective Actions
Fault
Display
Description Details Corrective Action
U 1
Main circuit
undervoltage (PUV)
Undervoltage in the DC main circuit during
running.
Detection level:
200 V class: Approximately 190 V or less.
400 V class: Approximately 380 V or less.
U 2
Control circuit
undervoltage (CUV)
Undervoltage in the control circuit during
running.
U 3
MC fault
The pre-charge contactor opened during
running.
• Check the power supply wiring.
• Correct the line voltage.
O c
Overcurrent (OC)
The Inverter output current exceeded the OC
level.
• Check the motor coil resistance.
• Extend the accel/decel time.
• Check the motor insulation.
• Multi-meter check.
O
Overvoltage (OV)
The main circuit DC voltage exceeded the OV
level.
Detection level:
200 V class: Approximately 400 V
400 V class: Approximately 800 V
Extend the deceleration time, add braking
circuit.
G F
Grounding (GF)
Earth fault)
Inverter output grounding current exceeded
50% of Inverter rated current.
• Check that motor insulation has not
deteriorated.
• Check that connection between Inverter and
motor is not damaged.
P U F
Main circuit fault (PUF)
• The direct current circuit fuse is blown.
• The output transistors were damaged.
Check for damaged transistor, load side short
circuit, grounding, etc.
∗ O H 1
Heatsink overheat
(OH1)
The transistor heatsink temperature exceeded
the allowable value.
(Fin temperature > n130: OH1 detection level)
(approximately 95°C)
Check the fan and ambient temperature.
O H 2
Heatsink overheat
(OH2)
The transistor heatsink temperature exceeded
the allowable value.
(Fin temperature > n134: OH2 detection level)
(approximately 105°C)
Check the fan and ambient temperature.
O L 1
Motor overload (OL1)
Inverter output exceeded the motor overload
level.
Reduce the load.
O L 2
Inverter overload (OL2)
Inverter output exceeded the Inverter overload
level.
Reduce the load, extend the acceleration
time.
∗ O L 3
Overtorque detection
(OL3)
Inverter output current exceeded the
overtorque detection level (n075).
Reduce the load, extend the acceleration
time.
5 C
Load short-circuit (SC) Inverter output (load) is short-circuited.
• Check the motor coil resistance.
• Check the motor insulation.
E F O
External fault from serial
communication
Fault occurred in the external control circuit. Check the external control circuit.
∗ Stopping method selection is available.
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