Section VIII
Trouble-Shooting Guide
006-0007129 10/12/2018
Rev B
57 of 60
UPS-1500 3-Phase Guide
www.synqor.com
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 connected to the AC OUTPUT that displays this start up surge
characteristic and the UPS is not capable of starting all loads at once, it may be possible to switch
“ON” the loads in a specific sequence, one by one allowing for a complete successful system
power-up. For instance, if the UPS cannot startup with a load consisting of lights and an induction
motor that has a startup current 5 times larger than the operating current, it may be possible
to start the induction motor first. Once the motor has reached its normal operating speed and
current, then the lights can be turned “ON” without triggering the UPS current limit protection.
