20 | SAMLEX AMERICA INC.
Symptom
Possible cause
Remedy
ON / OFF Switch is ON
• Switch is lighted
• There is no voltage at the at
the load end and the load is
shut down
• Voltage at the Load Terminals
(3, 4) is 13.8 ± 0.2V
• Voltage at Battery Terminals
(5, 6) is lower than the voltage
at the Load terminals and is
≤ 13.8 ± 0.2V
25A Fuse (F2) in the Load circuit is
blown due to:
- Excessive short time overload
current > 25A exceeding the
Time Current Characteristics of
the 25A fuse, or
-
Short circuit in the load circuit
Remove the cause of the overload
or short circuit
ON / OFF Switch is ON
• Switch is lighted
• Load is ON
• Voltage at the Load Terminals
(3, 4) is 13.8 ± 0.2V
• Voltage at Battery Terminals
(5, 6) is the same as the Load
Terminals (3, 4)
• Battery backup function does
not operate – Load shuts OFF
when AC power is interrupted
25A Fuse F1 in the battery circuit
is blown due to:
- Reversal of battery input
connections
- Short circuit in the battery
wiring
Check that the polarity of battery
connections is correct. Replace
the fuse.
Check for short circuit in the
battery wiring and correct.
GFCI outlet / GFCI breaker
supplying AC power to the unit
trips when the unit is switched
ON
Additional RF noise current from
the unit that is filtered to Earth
Ground increases the net Leakage
Current on the GFCI outlet / GFCI
breaker to > 5mA
Switch OFF other SMPS devices
operating from the same GFCI
outlet / GFCI breaker to reduce
the net leakage current to < 5mA.
Move the unit to another GFCI
outlet / GFCI breaker that has
lesser number of SMPS load(s) or
no SMPS load.
Power the unit from normal, non
GFCI outlet or from an outlet not
protected by GFCI breaker.
SeCtIOn 8 |
troubleshooting Guide
