Omron VARISPEED F7 User Manual

7-4
7
OH
Heatsink Overtemp
Heatsink Overheat
The temperature of the Inverter's
cooling fin exceeded the setting in
L8-02 and L8-03 = 0 to 2.
The ambient temperature is too
high.
Check for dirt build-up on the
fans or heatsink.
There is a heat source nearby.
Reduce the ambient tempera-
ture around the drive.
The Inverter's cooling fan(s)
stopped.
Replace the cooling fan(s).
Inverter's Cooling Fan Fault
(11kW and higher capacity)
This fault is detected when L8-32
is set to 1.
The Inverter's internal cooling fan
has stopped
OH1
Heatsink Max
Temp
Heatsink Overheat
The temperature of the Inverter’s
heatsink exceeded 105 °C.
The ambient temperature is too
high.
Check for dirt build-up on the
fans or heatsink.
There is a heat source nearby.
Reduce the ambient tempera-
ture around the drive.
The Inverter’s cooling fan(s)
stopped.
Replace the cooling fan(s).
Inverter's Cooling Fan Fault
(11kW and higher capacity)
This fault is detected when L8-32
is set to 1.
The Inverter’s internal cooling fan
has stopped
OH3
Motor Overheat 1
Motor Overheating
Detected when the level at A2,
programmed for motor tempera-
ture (Thermistor input, H3-09=E),
exceeds 1.17 V for the time L1-05
and L1-03 = 0 to 2.
Overheating of the motor was
measured by the motor thermistor.
Recheck the cycle time and
the size of the load.
Recheck the accel and decel
times (C1-).
Recheck the V/f pattern
(E1-).
Recheck the motor rated cur-
rent value (E2-01).
OH4
Motor Overheat 2
Motor Overheating
Detected when the level at A2,
programmed for motor tempera-
ture (Thermistor input, H3-09=E),
exceeds 2.34 V for the time L1-05
and L1-03 = 0 to 2.
Overheating of the motor was
measured by the motor thermistor.
Recheck the cycle time and
the size of the load.
Recheck the accel and decel
times (C1-).
Recheck the V/f pattern
(E1-).
Recheck the motor rated cur-
rent value (E2-01).
RH
DynBrk Transistr
Dynamic Braking Resistor
The protection of the heatsink
mounted resistor is activated
when L8-01=1.
This fault is only applicable when
using the 3% duty cycle resistor,
which is mounted on the
Inverter’s heatsink. For all other
resistors, set L8-01=0.
Overhauling load, extended
dynamic braking duty cycle,
defective dynamic braking resis-
tor.
Verify dynamic braking duty
cycle (load, decel times, motor
speed).
Monitor DC bus voltage.
Replace dynamic braking
resistor.
RR
DynBrk Transistr
Dynamic Braking Transistor
The built-in dynamic braking
transistor failed.
Defective or failed dynamic brak-
ing resistor caused braking tran-
sistor damage.
Cycle power to the Inverter.
Replace the Inverter.
Table 7.1 Fault Detection
Display Meaning Probable Causes Corrective Actions

Omron VARISPEED F7 Specifications

General

Brand	Omron
Model	VARISPEED F7
Category	Inverter
Language	English