Instruction manual

168
Protective
Operation
Output is
turned OFF
and motor
coasts to a
stop.
UV1 (Main circuit low
voltage)
Main circuit DC voltage
dropped below the low-volt-
age detection level while the
Inverter output is ON.
200 V: Stops at main circuit
DC voltage below ap-
prox. 200 V (160 V for
single-phase)
400 V: Stops at main circuit
DC voltage below ap-
prox. 400 V.
Check the following:
• Power supply voltage
• Main circuit power supply
connections
• Terminal screws: Loose?
• Monitor value
Confirm voltage (DC volt-
age) between terminals
"+1" and "-".
⇓
If there is no problem, the In-
verter may be faulty.
UV2 (Control power sup-
ply fault)
Inverter detected voltage fault
of control power supply dur-
ing running.
Replace the Inverter.
OH (Heatsink overheat)
Temperature increased be-
cause of Inverter overload op-
eration or intake air
temperature rise.
• Excessive load
• Improper V/f pattern set-
ting
• Insufficient acceleration
time if the fault occurs
during acceleration
• Intake air temperature
exceeding 50°C
• Cooling fan stops.
• Cooling fan deteriorates
its cooling capability or
stops.
• Fin is clogged.
• There is a thermal source
around the Inverter
⇓
Check the following:
• Load size
• V/f pattern setting (con-
stants n011 to n017)
• Intake air temperature.
• Cooling fan is turning
while the Inverter is run-
ning.
• Any foreign matters
adhere to the fan and that
they do not interrupt the
rotation.
• Fan is mounted properly.
• There is not a thermal
source around the
Inverter.
RH (Externally-mount-
ing-type braking resistor
overheat) *
Protection of externally-
mounting type
braking resistor operated.
• Insufficient deceleration
time
• Excessive motor regener-
ative energy
⇓
• Increase deceleration
time
• Reduce regenerative load
Fault Display Inverter
Status
Description Causes and Corrective
Actions
Digital
Operator
RUN (Green)
ALARM (Red)