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(3) Undervoltage(LU) (4)Overheating of heat sink (OH1)
(5) External alarm input (OH2)
Has (momentary) power fail-
ure occurred?
Reset and restart o pera-
tion. (If F14 is 0,1)
Faulty parts or loose connec-
tion in power control circuit?
Replace faulty parts and
fix connection.
Power supply voltage within
specified value?
Any load requiring large
starting current within the
same power distribution
group?
Modify power distribu-
tion system to satisfy
specified value.
Does LU activate when cir-
cuit breaker or magnetic con-
tractor switched to ON?
Probable faulty control circuit
of drive or error because of
noise, etc. Co
ntact
Saftronics
Power transformer ca-
pacity adequate?
Probable faulty drive.
Contact
Saftronics
LU
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Heat sink overheat-
ing (OH1)
Load excessive?
Reduce load.
Probable faulty drive
or error because of
noise, etc. Contact
Saftronics
.
Ambient temperature
within specified value?
Cooling air passage
blocked up?
Cooling fan rotating?
Arrange peripheral
conditions to secure
specified value.
Remove obstacles.
Replace cooling fan.
Yes
Yes
No
No
No
Yes
Yes
No
OH2
Connect alarm signal con-
tact. Short-circuit between
terminals THR - CM if no
signal is input.
Signal from external de-
vice connected between
control circuit terminals
THR - CM?
Is the alarm function of
the external device operat-
ing correctly?
Probable faulty drive or
error because of noise.
Contact
Saftronics
.
Remove the cause of alarm
function activation.
Yes
No
No
Yes
