Instruction manual

8. Fault Diagnosis
169
Protective
Operation
Output is
turned OFF
and motor
coasts to a
stop.
RR (Built-in braking tran-
sistor fault) *
Built-in braking transistor mal-
functioned.
Replace the Inverter.
OL1 (Motor overload)
Motor overload protection op-
erated by built-in electronic
thermal overload relay.
• Check the load size or V/f
pattern setting (constants
n011 to n017).
• Set the motor rated cur-
rent shown on the name-
plate in constant n036.
• Check that the settings of
motor protection (whether
motor cooling method is
self-cooled or fan-cooled)
and motor protection time
constant are made cor-
rectly.
• Check the load size, V/f
set value, operation pat-
tern, etc. to confirm that
the load is not excessive
under actual operation.
• Recheck the item of
motor protection and set
the constants again if
necessary.
• Refer to
 Reducing
Motor Noise or Leakage
Current Using Carrier
Frequency Selection
(n080) on page 81.
• Check the wiring
(increase of current
caused by rare shortcir-
cuit, etc.).
* 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)