10-10
LED display
Description
Possible causes
Corrective action
OS
(flash)
Motor over
speed
Motor speed exceeds
level set in 20-20 (PG
Over speed Level) for the
time set in 20-21 (PG
over speed time). Active
when 20-19 (= 0 or 1).
This fault is active V/F +
PG and SV control mode
(00-00 = 1 or 3 or 4).
Motor speed can be
monitored by 12-22
Motor speed overshoot
(ASR)
PG ppr set incorrectly.
Overspeed parameters set
incorrectly.
Check ASR parameters
group 21.
Check PG parameters
Check overspeed
parameters 20-20/20-12.
PGO
(flash)
PG open
circuit
PG pulses are not
received by the inverter
for the time specified in
20-26 (PG open circuit
detection time).
This fault is active V/F +
PG and SV control mode
(00-00 = 1 or 3 or 4).
PG cable disconnected.
PG has no power.
Mechanical brake active
preventing motor from
turning.
Check PG wiring.
Check PG power-supply.
Make sure brake is
released.
DEV
(flash)
Speed
deviation
Motor speed rises above
20-23 level (PG speed
deviation level) for the
time specified in 20-24
(PG deviation
time).Active when
parameter 20-22(=0 or 1).
This fault is active V/F +
PG and SV control mode
(00-00 = 1 or 3 or 4).
Load too heavy
Mechanical brake active
preventing motor from
turning.
PG wiring error.
PG parameters (group 20)
set incorrectly.
Acceleration / deceleration
time set to short.
Check load
Make sure brake is
released.
Check PG wiring.
Check PG parameters
20-23/20-24.
Increase Acceleration /
deceleration time.
OL1
Motor
overload
Internal motor overload
protection tripped, active
when protection curve
08-05 = xxx1.
Voltage setting V/F mode too
high, resulting in
over-excitation of the motor.
Motor rated current (02-01)
set incorrectly.
Load too heavy.
Check V/f curve.
Check motor rated current
Check and reduce motor
load, check and operation
duty cycle.
OL2
Inverter
overload
Inverter thermal overload
protection tripped. If an
inverter overload occurs 4
times in five minutes, it is
required to wait 4 minutes
before resetting the fault.
Voltage setting V/F mode too
high, resulting in
over-excitation of the motor.
Inverter rating too small.
Load too heavy.
Check V/f curve.
Replace inverter with larger
rating.
Check and reduce motor
load, check and operation
duty cycle.
