Product Manual

GPTS-30
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cord. Unplug the power cord. The switch will transfer to the inverter. The inverter
should always be connected so that it is only selected in the absence of both the
other supplies.
4. Troubleshooting
4.1 Low Voltage
Low voltage is harmful to most appliances. Contactor-based transfer switches
are also affected by low voltage; if the voltage level drops far enough the
contactor points will “chatter”. Sustained contact chattering can cause transfer
switch damage. Switches that have been damaged by chattering need to be
returned to the factory for replacement.
4.2 General Low Voltage
Low voltage can be caused by low voltage conditions such as an RV park with
inadequate wiring for crowded camper conditions where everyone’s electricity
suffers (brownout). In this case a voltmeter will be helpful and will show a low
voltage reading from the park receptacle, even before the RV is plugged in.
When you experience general low voltage conditions, remember that brownouts
can be harmful to most appliances. A better alternative might be to utilize the
generator until park voltage conditions improve.
4.3 Localized Low Voltage
Low voltage conditions can be caused by specific situations such as an
additional cord, which is too long and too small for the load. Do not attempt to
extend the RV power cord by using a 16-gauge 100-foot extension cord, or any
cord not rated for an RV-size load. A localized low voltage condition will result
when a load is turned on which is larger than that which the cord is designed for.
As soon as the RV tries to draw more current than the amount for which the cord
is rated, the voltage will fall within the length of the cord, and the RV will
experience low voltage. This is especially noticeable during in rush current
situations such as an air conditioner start-up.
This affects contactor-based transfer switches. The compressor will try to start;
the voltage will drop, which will cause the contactor to drop out, at which point
the voltage will rise to the pre-in rush level. The contacts will chatter when the
A/C compressor kicks in, however the voltage may read normal. Most meters are
not fast enough to record this voltage drop. You can test for low voltage readings
during this inrush cycle by reading voltage at the contactor terminals while
manually holding the contactor plunger down in its closed position. This will