Section VII
Trouble-Shooting Guide
006-0006885 08/14/18
Rev H
46 of 48
MINV-4000-1U-28 Guide www.synqor.com
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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 MINV is first turned on if the load is already connected
to the MINV. Or it may happen when the load itself is turned on and/or connected to the AC
OUTPUT of a MINV that is already running. Common examples of such loads are motors and
incandescent lights, but some electronic equipment can also display this characteristic. Such
loads can create various problems, including the following:
1)
The MINV fails to start the load:
The SynQor MINV 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 routing) that are tried. If the load is not started after these five routines
are attempted, the MINV will turn OFF. To get the MINV to try again, the user should again
push the ON/OFF switch on the front panel to the ON position.
If the MINV 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 factory for more information.
If there is more than one load of the AC OUTPUT that displays this start-up surge characteristic,
and the MINV 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 MINV 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.
2)
A newly started load disturbs the existing MINV loads.
A common problem can occur when the MINV is running and powering one or more loads
connected to its AC OUTPUT, and then an additional load of the AC OUTPUT is turned on. If
this newly started load draws a large surge current at start-up, it can cause the current limit
of the MINV’s AC OUTPUT to be triggered, and the AC OUTPUT voltage will then drop. This
drop could cause the existing loads to be disturbed. Furthermore, if the voltage drops far
enough, the MINV will turn off its AC OUTPUT and initiate a new start-up sequence (after 0.1
seconds.) This latter action would cause power flow to the existing loads to be interrupted.
If this disruption of existing loads is a problem, then the solution is to make sure the loads
that display this start-up surge characteristic are all started first, or that all loads are started
at the same time.
