selector switch S1 accordingly. Set FREQ. SELECT 50 Hz/60 Hz switch to applicable position. Place all AUTO-TRIP-
MAN switches (S53) on generator set control panels to AUTO, figure 2-6. Place parallel switches on all units to
PARALLEL. The 24 V DC control circuit breaker (located on the generator control panel) must be left ON in the
The external power connector (generator set power box control panel) should be connected to station (utility) power and
the external power breaker to ON. Place the PRE HEAT SYSTEM switch ON (figure 2-6). Pre heat must be in operation
six hours prior to generator set start up. All units are now ready to start in the event of a utility power failure. If the units
have been automatically started on line and it's desired to shut one unit down, simply turn that unit's AUTO-TRIP-MAN
switch (S53) to the MAN position. As the switch passes through the TRIP position, that unit's circuit breaker and the least
priority feeder breakers will open. After five minutes, allowing for engine cool-down, simply place the master START-
STOP switch (S1) to the STOP position as you normally would in manual operation.
If any unit, which has been automatically started and paralleled to the bus, develops a fault and trips off the bus, always
switch that unit's AUTO-TRIP-MAN switch to MAN first then back to AUTO after resetting the fault indicator. Do not
switch NO RETURN/TD RETURN/ INSTANT RETURN mode selector switch S1 to the NO RETURN position while units
are running during a cool-down cycle.
When the utility (normal) power becomes available (NORMAL POWER AVAILABLE light ON) and the mode selector
switch is at NO RETURN, the generator set(s) will continue supplying power. The TD RETURN position allows a 330
minute (adjustable) delay until the generator set(s) automatically trip off the bus. The INSTANT RETURN position
immediately trips the generator set(s) off the bus. After the generator set(s) are automatically disconnected from the bus
an automatic five minute (adjustable) engine cool-down cycle occurs before the generator set(s) stop.
(3) Optional Uses
Terminal board points TB1-7, 8, and 9 are available for customer use as remote indication of utility power.
Additional normally closed contacts of the BR relays are available between TB3-9 thru TB3-16 for remote indication
of each units circuit breaker status (in automatic operation only).
Each generator has governor control summing junctions available through J3-H (Shield) J3-G and J3-F whenever a
units circuit breaker is closed (in automatic operation only). Future use of these terminals are dependent upon
J3-S, on the generator set, is for remote indication or T-7 winding (120 VAC) available whenever the generator is
running, regardless of circuit breaker being closed or open. Functional use is dependent upon user.
Terminal board points TB3-17-18-19 can be wired to control an electrically operated utility breaker and/or transfer