Operator's Manual

Operator’s Manual ASCO 336 / 337
381333-427 A ASCO Power Technologies Page 11
Figure 8. Emergency Stop buttons for generators.
Features and Options
The standard 336/337 system is automated and simple to
operate. When the Master Control Switch is turned to On
or a remote control contact closes while in Auto mode, all
available generators start and synchronize to the load bus.
Generator Emergency Stop
Direct wired system and individual generator Emergency
Stop buttons are standard. These are emergency only
controls. Under normal operation, generators should go
through a cool-down process before turning off.
Power Management Selector
The Power Manager Selector controls the optional Power
Management system to provide four additional features:
 Generator Management or Gen shed / Gen add
 Load Management or Load shed / Load add
 Run Time Management or Run Time Equalization
 Start Next Gen on Alarm
Generator Management, or Gen shed / Gen add will add and
remove generators to the bus as needed to maintain a certain
percentage of spinning reserve KW. Spinning reserve is the
sum of the KW of the available generators minus KW
consumed. Numbers in brackets [8013, 70%] below are the
memory locations of that setting and typical values. These are
the factory default settings and should work for most
installations, but they can be changed by trained personnel
with the necessary password(s).
The Generator Management sequence is:
1) All generators will start or are running before Power
Management is switched on.
2) All loads will be allowed to close onto the load bus if
Available Power (see load control) settings are met.
3) If the remaining generators will stay below the Load
Dependent Stop Setpoint [8013, 70%] when the next
generator is off line, the system will, after a
programmable time delay [8014, 30 sec], deload and shut
down the next generator.
4) If the spinning reserve falls below the Load Dependent
Start setpoint [8003, 70%], the next lowest generator will
be added to the bus.
All generators share the percent of load equally, thus all
controllers see the same value. Generator management is
based on this percentage of load.
This feature is a Power Management function. Turning off
Power Management will remove the shed signal and start all
available generators.
NOTIC
E
These values are examples and should be set to
the correct system-specific values during startup.
Master Control Switch
Power Manager Selector
Generator Emergency
Stop button