Asco 4820, User Manual, Page: 26 / 51

Operation
ASCO Model K875A Outdoor Load Bank
4-4
4.
Place AUTO/MANUAL switch to AUTO.
5.
Start the generator under test.
6.
When the Auto/Transfer Contact is closed, the Auto Load Shedder will be active. The Auto
Load Shedder will automatically start the blower and apply load steps. As the load on the
generator lessens, the Load Shed Controller will automatically apply load steps until the
overall generator load exceeds the minimum setpoint. The Load Shed Controller
automatically removes load steps when the generator load exceeds the maximum setpoint.
When the Auto/Transfer Contact is opened, the Auto Load Shedder will be inactive and the
blower will be stopped automatically.
OPTIONAL CONTROLLER OPERATION AND ADJUSTMENTS
NOTE
The current setpoints for the Load Shedder option have been preset
by the factory. Adjustments can be made as follows:
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W A R N I N G
Always put a short or shunt across the current transformer when
servicing the Automatic Load Shed Controller. Primary current
flowing through an unshunted current transformer will destroy the
transformer with possible harm to personnel.
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Before the current setpoint(s) can be adjusted, the operator must determine the maximum load the
Controller should maintain (generally 60% to 80% of the total generator KVA).