CKM-CE75-E1M Troubleshooting
24-10707-112 Rev. D
A-2
AC FLT LED lit and AC FLT relay indicating a trouble condition
Primary AC voltage
low or missing
Verify that the AC input voltage is 120 V or 230 V (±15%) with a
meter.
For safety, the green AC ON LED indicates the presence of any
AC voltage on the input, but not the integrity of the voltage.
120/230 jumper (JP1)
set incorrectly
Verify that JP1 is set correctly: intact for 120 V input, cut for 230 V
input.
Internal problem Contact the manufacturer.
DC1 LED extinguished
Blown DC1 fuse Check the fuse.
Power supply shut
down
Verify DC output voltage, AC power, and backup battery voltage
(if used)
Check output load integrity and current draw.
If the power supply detects ten output faults within one minute,
the supply shuts down, transfers to battery backup (if available),
and generates a fault condition. Cycle AC power to reset the
supply after determining the cause of the output fault condition.
DC2 LED extinguished
Blown DC2 fuse Check the fuse.
Verify the integrity of the output wiring and powered devices
before replacing any ruptured fuses. Replace fuses only with the
same type and rating.
Output disabled due
to FAI
If the DC2 fuse is in the DC2+ NC fuse holder, the DC2 output will
be disabled upon receipt of an FAI input, causing the DC2 LED to
extinguish.
If the DC2 fuse is in the DC2+ NO fuse holder, the DC2 output will
be disabled and the DC2 LED will be extinguished until receipt of
an FAI input.
REV BAT LED lit
Battery connection
reversed
Check the polarity of the battery connections at both ends of the
battery harness.
AC ON LED extinguished
Missing or extremely
low AC input
Verify that the AC input voltage is 120 V or 230 V (±15%) with a
meter.
Bl o w n A C fu se T h e C K M- F PO p o we r s upply’s AC input fuse is non-replaceable,
as rupture of this fuse indicates a major malfunction within the
CKM-FPO supply. Contact Johnson Controls.
Possible cause Suggested Solution
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