SAMLEX AMERICA, INC. | 9
SECTION 4 | Troubleshooting Guide
Symptom Possible Cause Remedy
ON / OFF Switch is ON
• Switch is NOT lighted
• No DC output
No AC power from the
AC outlet
Internal AC side fuse
is blown
Check AC power is available at the AC
outlet. Breaker feeding the AC outlet may
have tripped.
Open the top cover and check the AC side
fuse. Replace if blown.
If the fuse blows again, the input section is
damaged. Please call Tech Support.
ON / OFF Switch is ON
• Switch is lighted
• No DC output
Unit has shut down due to over
temperature – Temperature of
output transformer windings is:
≥ 105°C ± 5°C / 221°F ± 9°F
(For SEC-1223 only)
Check that the fan is running. If not, the
fan / fan control circuit may have been dam-
aged. Call Tech Support.
Check that the fan suction vents on the
sides of the unit and the discharge vents on
the bottom of the unit are not blocked.
The unit will reset automatically when the
transformer windings cool down to
≤ 75°C ± 5°C / 167°F ± 9°F
ON / OFF Switch is ON
• Switch is lighted
• DC Output voltage
drops
If the voltage loses regulation
and drops to < 13.5V, the unit is
overloaded and is in current limit.
The load is trying to draw ≥ the
current limit value of 35A
If the voltage drop is considerable
with voltage < 2V, the load side
is seeing a short circuit and short
circuit current limited to the cur-
rent limited to 35A is being driven
into the short circuit.
AC input voltage setting has been
changed to 230 VAC but AC
input voltage fed to the unit is
120 VAC.
Reduce the current drawn by the load to
less than the continuous rating of 30A.
Switch OFF the load. Remove the short
circuit on the load side.
Ensure that AC input voltage setting has
been changed back to preset condition of
120 VAC.
GFCI outlet / GFCI breaker
supplying AC power to
the unit trips when the
unit is switched ON
Additional RF noise currents from
the unit that are ltered to Earth
Ground increase 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
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