Operator's Manual

Operator’s Manual ASCO 336 / 337
381333-427 A ASCO Power Technologies Page 13
Run Time Management or Run Time Equalization
Run Time Management (RTM) function may be set to keep
the generators roughly equal in running hours. This could
result in all generators requiring maintenance at the same time,
so RTM may be also be set to run a generator(s) more hours so
maintenance is staggered. When the run hours timer setting
[8111, 24 hours] expires, the generator with the lowest
running hours will be started, synchronized, soft loaded, and
the one with the highest hours will be shut down. Setting
[8111] to 24 hours will equalize running hours every day.
Setting it to 30 days will run one generator for 30 days, then
run the next one for 30 days, intentionally staggering the
running hours.
Start Next Gen On Alarm
If Power Management is On and one or more generators have
been turned off by Generator Shed and a running generator
goes into a warning or has a non-fatal alarm, the next available
generator will start automatically, synchronize, and take on the
load. Then the generator in alarm will shut down.
This feature requires either a hardwired contact input from the
generator controls to CTBx:1 or a J1939 CANBUS connection
to the ASCO Power Technologies control system on CTBx:37,
38, 39 and that correct programming be done during startup.
If a generator has a fault that results in an immediate
shutdown, Power Management will start the next generator,
switch the CTTS mechanisms as needed, and restore power to
the load. See also AC Control Power Selector circuit.
If only 1 generator is running and the circuit breaker trips, it is
could be due to a short circuit. If the Power Management
Option is not installed, the system will be off and require
operator intervention to return to service. If the Power
Management option is installed, it is possible to either (1) start
the next generator and energize the load bus or (2) lock out the
system to prevent any generator from starting until the
operator resets the system. This is selected during startup. The
factory default is to lock out the system and wait for an
operator reset. With the sudden loss of AC power the CTTS
cannot switch the dead generator off the bus, so as soon as
another generator starts, the closed CTTS on the genset with
the tripped circuit breaker will open. If this is not possible, for
example if only 1 gen is available and it is the one that tripped,
obviously the system will not automatically return to service.