14
OPM-155/A
If you have the proper voltage at the generator the next
step is to check the voltage at the generator terminals in
the Automatic Transfer Switch. The voltage between the
G1 and the G3 terminals should be the same as it was
on the generator front panel. The voltage should also be
checked between the hot terminals (G1 and G3) and the
G-N to be certain of a balanced voltage output and a solid
neutral connection. The voltage between G1 and G-N
should be about 120 volts AC (277 on 480 units). The same
approximate voltage should be found between terminals
G3 and G-N (120 volts AC).
On three phase panels the G2 voltage level should also be
checked. ON 240 VOLT (DELTA) SYSTEMS BE SURE YOU
KNOW WHERE THE HIGH VOLTAGE “WILD” LEG IS. IT
MUST BE IN THE SAME LOCATION ON THE LINE SIDE AS IT
IS ON THE GENERATOR SIDE.
(i.e. if it’s on L-3 on the line side it must be on G-3 on the
generator side. Also on three phase systems make sure that
the rotation is the same on the generator as it is on your
line power. Failure to insure proper rotation will cause three
phase motors to spin backwards possibly damaging them.
NOTICE
If for any reason during the check out procedure the
voltage and frequency are not correct, depress the
STOP/RESET button and correct the trouble before
proceeding.
4. Stopping - There are two ways to stop the unit when it is
in the manual mode. Pressing the STOP/RESET button will
stop the unit immediately. Pressing the AUTO mode button
will stop the unit but only after the cool down timers have
timed out and there is no remote start signal being sent to
the unit.
AUTO MODE
To activate the automatic start mode you will just need to
depress the AUTO button, the LED indicator beside the
button confirms that the unit is in automatic mode.
To test the Automatic Transfer Switch, follow the instruction
on the operator’s manual that came with the transfer
switch. If you get a fault during the initial start up or prior
to start up, it is most likely a false warning light. Simply reset
the ATS start over.
Once you have completed testing of the ATS, be sure you
ALWAYS leave the system in the standby mode,unless
servicing the unit. For standby operation, press the AUTO
button on the front of the control. The green light should
light up next to the AUTO button.
NOTE: For setting the exerciser circuit, for all ATS, see the
operator’s manual shipped with the ATS.
