Operator's Manual

ASCO 336 / 337 Operator’s Manual
Page 8 ASCO Power Technologies 381333-427 A
Figure 6. Button and indicator lights on generator controller for electrical operation.
3 – Electrical Operation
This procedure will check the electrical operation of the 336
system. The generators will be started and connected to the
load bus. Be sure that these controls are the following
positions before starting:
 Master Control Switch in Off position
 Power Management Selector switch in Off position
 Generator 1 Circuit Breaker closed (on)
 Generator 2 Circuit Breaker closed (on)
 Both Generators off, not running
 Generator starting controls in Automatic position
 Transfer switch contacts open (both upper & lower)
Close the system enclosure door and tighten the
screws (if provided) before you test electrical
operation.
Perform steps 1 through 5 at the right. Observe the status
lights. See Figure 6.
NOTE:
See controller manual settings in the controller.
The speed, KW, voltage, & KVAR regulators should
be properly tuned during start up for stable system
operation by a qualified ASI service technician.
This completes the functional test of the transfer switch.
Leave the engine-generator starting controls in the automatic
position.
1
Press the AUTO (automatic)
button on both controllers.
2
Turn the Master Control
Switch to the On position.
3
Both generators should start. Both generator
running lights and both generator acceptable
lights should come on. The transfer switch
should operate to close one set of contacts.
The close light should come on, and the power
on the load bus light should come on. The
connection of the second generator to the load
bus occurs when the generators are in
synchronism.
4
Turn the Master Control
Switch to the Off position.
5
The transfer switch contacts should operate
again to open both sets of contacts. The close
lights should go off. The power on the load bus
light should also go off. After a cool-down
period, both generators should shut down.
WARNING
!
AUTO (automatic)
button
Generator voltage & frequency acceptable light
Generator
running light
Power on the
load bus light
Transfer switch closed light
NOTIC
E