YASKAWA YASNAC i80, Maintenance Manual

Page: 113 / 226

4.3 TROUBLESHOOTING WITHOUT ALARM CODES
The following examples are instructions for locating and
correcting the troubles not indicated by alarm codes.
For further details of signal meanings expressed by the
address
, refer to Section of in
Connecting Manual. 5 )
4.3.1
POWER CANNOT BE SUPPLIED
Table 4,31
Cause of Trouble
No power supplied to
NC unit.
Alarm LED of CPS-12N
lights.
Power ON/OFF Switch
is
not set
properly.
1 2 3
❑
E O F
(invalid/valid
.
(Set at
factory
prior to
s h i p m e n t )
Check Method
insure that SOURCE LED (green) of DC power
or inside CPU module
ights.
Nor-
m al
Trou
ble
Dis-
play
or LED Display
Signal
Display ‘ E D
Color
POWER
ON
status
+5 v
Trouble
+5 v,
Trouble v ‘
e d
-12 v
Trouble
1
Trouble
+24 V
Red
Function &
Cause
Lights when AC
power is on, out
when power is off.
Lights when
SOURCE
above
170
at NCMX
Lights at +5 V
overvoltage or
Lights at V
overvoltage or
12 V undervoltage.
Lights at +24 V
overvoltage
or
Lights with
external
signal, and
overheat.
lights for external trouble when
CN05 connector between 4 and 7 short-circuits.
SW5
Swl
SW2
SW1 and Settina
Use panel
(POF ) only
Use external
device (E OF)
only
1 2 3
❑
Use both
Solution
Check molded-case
circuit breaker or NC
panel and also
connector CN05 of
or
When trouble in Table
on the left is displayed
by LED, correct the
trouble, then, turn ON
power again. If the
trouble is not corrected
by this procedure,
trouble may be in the
power unit. Contact
your YASKAWA
representative
If overcurrent causes
the trouble and the
cause is removed, the
power supply can be
turned on again after
it turned off.
Unless the main circuit
breaker is turned off
and then on, the power
supply cannot be
turned on again even
if the cause has been
removed since the
alarm circuit in the
CPS cannot be reset.
Set correctly shorting
plug SW1 and SW2 at
left corner on
FC230B or FC260
a
A
103