On operating generator set (generator 1), set UNIT-PARALLEL switch (16, figure 2-9) to
Start generator set 2. Adjust voltage and frequency to match generator set 1.
At switch box, set generator set 2 ON-OFF switch (3 or 6) to ON (Switch box STATUS and ON
LINE lights for both generator sets should be lit).
At generator set 2 control panel:
Set UNIT-PARALLEL switch (16) to PARALLEL. Both SYNCHRONIZING LIGHTS (12)
should be going bright to dark together.
If synchronizing lights on generator set 2 do not go bright and dark in
unison, the phasing is wrong. Shut down generator sets and check that
load cables are connected properly. Failure to observe this caution can
result in damage to generator sets.
Increase frequency until SYNCHRONIZING LIGHTS (12) blink together one or more times per
Decrease frequency until SYNCHRONIZING LIGHTS (12) blink together once every 3-4
While both synchronizing lights are dark, position and hold AC CIRCUIT INTERRUPTER
switch of generator set 2 in-the CLOSED position until indicator lights. SYNCHRONIZING
LIGHTS should go out (both generators are now operating in parallel).
Once both of the generator sets are on line and supplying power to the load in parallel, perform
the following steps to transfer the load.
(1) At the control panel of the generator set that is to be taken off line (generator set 1), set the
AC CIRCUIT INTERRUPTER switch to the OPEN position. Set UNIT-PARALLEL switch to
UNIT, MASTER SWITCH to OFF. (At switch box, STATUS and ON-LINE lights for generator
taken off line should go off.)
(2) At the control panel of the running generator set (generator set 2), place the UNIT-PARALLEL
switch to UNIT. The load has now been transferred.
Perform the generator PMCS listed as DURING for generator set 2 and AFTER for generator set