SECTION 5 CONTROL FEATURES – ENGINE EXERCISERS
5 --- 1
These timers periodicallyexercise the emergency engine-generator plant. They can be set to exercisewith or without
load transfer, or they can be completelydisabled. The engine-generator should be exercised under load once a weekfor
a minimum time period of 20 minutes, or follow the recommendations of the engine-generator set manufacturer. Refer
to page 4–2 for location of DIP switches, battery (provided), and jumper block in the controller.

BUILT–INENGINE EXERCISER

The engineexerciser included in ASCO Series300
AutomaticTransfer Switches provides a once a week
20–minute exercise period. It occurs immediately when
the Set Engine Exerciser push button is pressed (and
held for at least 5 seconds),and then at the same time
weekly thereafter. A9 volt alkaline battery (Duracell
MN1604, Everready 522, or Panasonic6AM6) is
furnished and installed in the controller to maintain the
setting. Thebattery jumper block must be shifted to the
ON position. See Figure 4–2 on page 4–2.
Fillin day a ndt ime set. Week Day ______ Time _______.

DIP Switch Settings

FUNCTION S1 DIP
SWITCH
S2 DIP
SWITCH
Std. Timer
Enabled
Actuator
7on
7
Actuator
5on
5
Std. Timer
Disabled
Actuator
7off
7
Actuator
5on
5
Exercise
without
Load
Actuator
8off
8
Exercise
with Load
Actuator
8on
8
Shaded DIP switchesare standard factory settings.
status light
If Exerciserwith Load is set,
transfers load to Emergency.
If Exercisewith Load is set, retransfers load to
Normal, then stops generatorafter min. cooldown.
Press to cancel an active exercise
period (stops generator). Press and hold for5 sec. or until status light
blinks rapidly to setexercise period immediately
and every week hereafter (generator starts).
Figure 5-1. Operator panel pushbuttons and light.
Select below either Exercise with out Load or Exercise with Load according to the settin g of DIP switch S1, actuator 8. The
load transfers from the Normal source to Emergency source (generator) and back again if Exercise with Load is selected.

Exercise without Load, DIP Switch S1, Actuator 8 off

8

How to Set Built–In Timer

Step Function Explanation
Push Button Status Light
1
Set Engine
Exerciser
hold 5sec.
blinks rapidly
OPOPOP set exercise period Exercise the generator now and
every week at this time hereafter.
2release blinks slowly
OPPOPP exercise period now active Generator starts and runs.
3press Bypass
Time Delay Ostays on cancelactive exercise period Generatorstops.
4 — Ostays on generator off Exerciser enabled; repeats every 7 days.

Exercise with Load, DIP Switch S1, Actuator 8 on

8

How to Set Built–In Timer

Step Function Explanation
Push Button Status Light
1
Set Engine
Exerciser
hold 5sec.
blinks rapidly
OPOPOP set exercise period Exercise the generator now and
every week at this time hereafter.
2release blinks slowly
OPPOPP exercise period now active Generator starts and runs;
the load transfers to Emergency.
3press Bypass
Time Delay
blinks slowly
OPPOPP cancel active exercise period
The load retransfers to Normal; then
generator runs for 5 minute cooldown
( light blinks slowly during cooldown ).
4 — Ostays on generator off Exerciser enabled; repeats every 7 days.
NOTE:EverytimeSETENGINE EXERCISER push button ispressed (held 5 seconds) the exercise period is changed.