Yaskawa Matrix Converter - Manual (Page 326)

Protective and Diagnostic Functions
7-
5
OH
(OH1)
Heatsnk
Overtemp
(Heatsnk
MAX
Temp)
Cooling Fin Overheating
The temperature of the MxC's cooling
fins exceeded the setting in L8-02 or
105
°C.
The ambient temperature is too high. Install a cooling unit.
There is a heat source nearby. Remove the heat source.
The MxC's cooling fan has stopped.
Replace the cooling fan. (Contact
our sales representative.)
Note Check the flowchart below for appropriate corrective actions for CIMR-ACA4110 and
CIMR-ACA4160.
OH3
Motor
Overheat 1
Motor Overheating Alarm
The MxC will stop or will continue to
operate according to the setting of L1-
03.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the Motor Rated Current
(E2-01).
OH4
Motor
Overheat 2
Motor Overheating Fault
The MxC will stop according to the
setting of L1-04.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the Motor Rated Current
(E2-01).
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
Does the fan rotate
on setting L8-10 = 1?
Overheat alarm
has occurred.
YES
YES
Error remains
after 5 minutes.
The cooling fans are faulty.
IGBT has overheated.
Replace the cooling fans.
Replace the external
cooling fans.
NO
NO
The main circuit
relays are faulty.
Replace the main circuit
relays. (Contact our sales
representative.)