Protective Function/Error Description; Table 6.1 Fault Display And Contents (Faults In Inverter) - Samsung MOSCON-E7 User Manual

6.1 Protective function/error description

In case of the wrong parameter setting or faulty writing, the inverter
and/or the motor may not function as commanded.
The MOSCON-E7 has many protective functions, which is displayed on
the digital operator when the fault occurs.
When the fault is detected, the fault contact output operates and the
inverter output to be shut off causing the motor to stop. The stopping
method can be selected for some faults.
• Refer to the table below for the fault display, cause and corrective
actions.
• To reset the fault, use one of the followings:
- Press the reset key on the digital operator.
- Turn the power supply off and on again.
- Turn on the fault reset terminal.

Table 6.1 Fault display and contents (Faults in inverter)

Code Meaning
• A short-circuit or
ground fault (caused
OC2 The inverter
by motor damage, worn
Short circuit output or load
insulation, or a damaged
Error was short-circuited.
cable) at the inverter
output.
• A short-circuit or
ground fault (caused
by motor damage,
worn insulation, or a
damaged cable) at the
The inverter inverter output.
output current • Too large load or too
OC1
exceeded 200% short accel/decel time.
Over current
of the rated • A magnetic switch was
current instantly. switched at the inverter
output.
• A special-purpose
motor with too large
capacity for the inverter
is used.
6. Troubleshooting 6-3
Cause Corrective action
Reset the fault after
correcting.
Reset the fault after
correcting.
6-4 MOSCON-E7 User's Manual
Code Meaning
Fan at the
FAN bottom of the • Defective cooling fan
Fan stopped. inverter is not or fan cable.
operating.
• Too high ambient
temperature.
The temperature
of the inverter's
OH2 Inverter • Heat source nearby
cooling fin
Over-Heated.
the inverter.
exceeded
approximately95¡ É .
• Inverter cooling fan is
malfunctioning.
• Too short deceleration
time.
• Too large regenerative
The main circuit
energy from the motor.
DC voltage
OV Main exceeded the
Over-Voltage. over voltage
detection level.
200V class:410V.
• Too high power
400V class:820V.
supply voltage.
• A open-phase
The main circuit
occurred with the input
DC voltage is
power supply.
below the under
UV1 Main • A momentary
voltage detection
Under-Voltage. power loss.
level.
• Too large voltage
200Vclass:190V.
fluctuation in the
400Vclass:380V.
input power supply.
There was output
OL3
of 180% of the • Too heavy load or too
Over-torque
rated current rapid acceleration.
Det.
instantly.
Cause Corrective action
Check the wiring and
replace the fan if
necessary.
Install a cooling unit.
Remove the heat
source.
Replace the cooling
fan.(Contact Samsung)
Increase the
deceleration time or
connect a braking
resistor (or unit).
Decrease the voltage
within specification.
Reset the fault after
Correction.
• Set P3.02 and
P3.03 appropriately.
• Check the
mechanical system
and correct the cause
of the over torque.