Samlex America STS-30 - Manual (Page 12)

12 | SAMLEX AMERICA INC.
SecTIOn 4 | Troubleshooting
low Voltage
Low voltage is harmful to most appliances. relay based transfer switches are also af-
fected by low voltage; if the voltage level drops lower than the holding voltage of the
coil, the relay contacts will “chatter”. Sustained contact chattering may cause damage.
general low Voltage
Low voltage can be caused by low voltage conditions such as in 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 read-
ing 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.
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 inrush current situations such as an air conditioner start-up.
time delay For generator
As already explained earlier, once a generator is started, it should not be loaded im-
mediately. The time delay is necessary during generator start-up so that the generator
does not have to start under load; the delay is not necessary for transfer between utility
power / Shore Power Cord and inverter. Therefore, in transfer switch operation where
the Transfer Switch is controlling an AC source other than a generator, the time delay
should be disabled and DIP Switch SW1 should be set to (oN) position. This will allow
instantaneous switching.
Another time for disabling the delay is during diagnostic and troubleshooting efforts;
if disabling the delay causes the switch to work when it otherwise won’t, then the time
delay circuit has malfunctioned and the control board PCb1 (fig 2) will be required to
be replaced. To disable the time delay, the DIP Switch SW1 (fig 2) should be set to (oN)
position. When time delay is disabled, the transfer will be instantaneous.