Section VII
Trouble-Shooting Guide
006-0007097 02/14/2019
Rev E
44 of 52
UPS-1250DC Guide www.synqor.com
LED
Indication
Possible Problem(s)
D1:
AC INPUT
Power LED
LED is OFF
• The AC INPUT power source is not turned on.
• The AC INPUT cable is not connected or it is wired wrong.
• The AC Breaker on the rear panel is OFF.
• The AC INPUT voltage is either too low or too high.
LED is a STEADY
GREEN and not a
PULSING GREEN.
UPS is instead
running off the
optional DC INPUT
or the BATTERY
• The AC INPUT voltage is within its proper range but the UPS is not
selecting it for its source of power.
• The AC INPUT voltage and the total load power may exceed the
power derating curves given earlier in this Guide.
• The AC INPUT cable may have too much series resistance. Thicker
wire should be used.
D0:
DC INPUT
Power LED
LED is OFF
• The optional DC INPUT is not available on this unit.
• The DC INPUT power source is not turned on.
• The DC INPUT cable is not connected or it is wired wrong.
• The DC INPUT cable is connected to the DC source with the
wrong polarity.
• The DC INPUT voltage is either too low or too high
• The DC INPUT cable may have too much series resistance. Thicker
wire should be used.
A0:
DC OUTPUT
Power LED
LED is OFF
• The UPS is OFF and needs to be turned ON.
LED is AMBER
• The DC Output load is higher than 1250 W.
• The DC Output is shorted within the cable or a load.
• Some other source of power is connected to the DC OUTPUT.
LED is RED
• The UPS has been turned OFF, but due to a malfunction within the
UPS it is still running and providing an DC OUTPUT voltage.
• Some other source of voltage is connected to the DC OUTPUT and
is powering it when the UPS is not