8 Fault Diagnosis
205
Protective
Operation
Output is
turned OFF
and motor
coasts to a
stop.
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 (122°F)
• Cooling fan stops.
• Cooling fan has lowered
cooling capability or
stops.
• Heatsink 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.
• Foreign matter on the fan
is not interrupting rota-
tion.
• Fan is mounted properly.
• There is no thermal
source around the
Inverter.
OH9 (Motor overheat-
ing)
• Check the size of the load
and the length of the
acceleration, decelera-
tion, and cycle times.
• Check the V/f characteris-
tics.
• Check the input motor
temperature.
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
* Indicates that an Inverter of 5.5 kW and 7.5 kW (200 V and 400 V Classes) is attached.
Fault Display Inverter
Status
Description Causes and Corrective
Actions
Digital
Operator
RUN (Green)
ALARM (Red)
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