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SECTION 5 CONTROL FEATURES – ENGINE EXERCISERS
5 --- 1
These timers periodically exercise the emergency engine-generator plant. They can be set to exercise with or without
loadtransfer,ort hey canbecompletelydisabled. Theengine-generator shouldbe exercisedunder loadonce aweekfor 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 swi tches, battery (provided), and jumper block in the controller.
BUILT–IN ENGINE EXERCISER
The engine exerciser included in ASCO Series 300
Automatic Transfer Switches provides a once a week
20–minute exercise period. It occurs immedia tely
when
the Set Engine Exerciser push button is pressed (and
held
for at least 5 seconds), and then at the same time
weekly thereafter. A 9 volt alkaline battery (DuracellR
MN1604, EverreadyR 522, or PanasonicR 6AM6) is
furnished a nd installed in the controller to maintai n the
setting. The battery jumper block must be shifted to
the
ON position
. See Figure 4–2 on page 4–2.
Fill in day and time 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 switches are standard factory settings.
status light
If Exerciser with Load is set,
transfers load to Emergency.
If Exercise with Load is set, retransfers load to
Normal, then stops generator after min. cooldown.
Press to cancel an active exercise
period (stops generator).
Press and ho ld for 5 sec
. or until status light
blinks rapidly to set exercise period immediately
and every week hereafter (generator starts).
Figure 5-1. Operator panel pushbuttons and light.
Select below either Exercise without Load or Exercise with Load according to the settingof 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
Exer ci se r
hol d
5sec.
blinks rapidly
●❍●❍●❍
set exercise period
Exercise the generator now and
every week at this time hereafter.
2 release
blinks slowly
●❍❍●❍❍
exercise period now active Generator starts and runs.
3
press Bypass
Time Delay
● stays on cancel active exercise period Generator s tops.
4 — ● stays 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
Exer ci se r
hold
5sec.
blinks rapidly
●❍●❍●❍
set exercise period
Exercise the generator now and
every week at this time hereafter.
2 release
blinks slowly
●❍❍●❍❍
exercise period now active
Generator starts and runs;
the load transfers to Emergency.
3
press Bypass
Time Delay
blinks slowly
●❍❍●❍❍
cancel active exercise period
The load retransfers to Normal; then
generator runs for 5 minute cooldown
( light blinks slowly during cooldown ).
4 — ● stays on generator off Exerciser enabled; repeats every 7 days.
NOTE:EverytimeSET ENGINE E XERCISER push button is pressed (held 5 seconds) the exercise period is changed.