Section VIII
Trouble-Shooting Guide
006-0007068 UPS-1500-S-2S Guide
Rev E
57 of 60
09/10/20
Two other conditions should be mentioned:
• The fans are off when the UPS is running
It is normal for the fans to be off, even if the UPS is running and delivering power to the load,
as long as the temperature of the UPS is low enough. If the Fan Service Required LED (C0) is
green, both of the fans are OK, even if they are not running.
• The UPS does not turn off when the ON/OFF switch is pushed down
When the ON/OFF switch on the front panel is pushed down, the UPS does not respond to this
signal for approximately 1 second. This is done to ensure that the UPS is not accidently turned
off. If the user does not hold the ON/OFF switch in the OFF position for a full second before
releasing it, the UPS will not turn off.
Other possible situations that are the result of external issues that a user could
likely correct are related to:
• Loads that draw a large surge of current at start-up
Some AC loads draw a very large amount of current when an input voltage is first applied to
them. This might happen when the UPS is first turned on if the load is already connected
to the UPS. Or it may happen when the load itself is turned on and/or connected to the AC
OUTPUT of a UPS that is already running. Common examples of such loads are motors and
incandescent lights, but some electronic equipment can also display this characteristic.
Several problems could arise with such a load:
▪ The UPS fails to start the load:
The SynQor UPS is designed to try various start-up routines when it is first turned on to overcome
the problem of surge currents with some loads. There are five such routines (or repetitions of
a given routine) that are tried. If the load is not started after these five routines are attempted,
the UPS will turn OFF. To get the UPS to try again, the user should again push the ON/OFF
switch on the front panel to the ON position.
If the UPS cannot start the load, then it may be possible that a custom start-up routine could
be devised to work with this particular load. Contact the SynQor factory for more information.
If there is more than one load of the AC OUTPUT that displays this start-up surge
characteristic, and the UPS is not capable of starting with all of them connected and
switched on, it may be possible to switch on each load in turn. For instance, if the UPS
cannot start up with a load consisting of a large bank of incandescent lights, then it may be
able to start if various sections of the lights are switched on in sequence.
