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Transfer Switch & Engine Generator
This procedure checks the electrical operation of the
automatic transfer switch. If the actual operation does not
follow this procedure, consult the troubleshooting section
in the transfer switch manual.
If you are not using the ASCO165 transfer switch you will
need to follow the information in the manual for your ATS
for initial starting and testing procedure. This procedure
will also test the interface between the transfer switch and
the engine generator set.
*************
***** WARNING *****
*************
PERSONAL INJURY HAZARD -
Install front cover on
to transfer switch before operation. An electrical system
fault could cause a flash and severe personal injury.
1. Turn on the preferred source (utility) circuit breaker.
The utility source acceptable light should now come on
as well as the transfer switch on utility light. If these
lights fail to come on recheck your incoming power to
insure you have 240 volts nominal. If not, troubleshoot
your utility source before continuing.
2. Move the toggle switch in the generator from the
stop position to the auto position. The unit is now
ready to be operated from the Automatic Transfer
Switch.
3. Turn on the alternate source (generator) circuit
breaker.
4. Press and hold the Push to Test button until the
generator (alternate source) acceptable light comes on
and stays on. Then release the button. This will start
up your generator set.
This light indicates that the generator is running and
the output voltage and frequency are within acceptable
limits. Under normal conditions this light should come
on in 5 to 10 seconds. If the light does not come on
and stay on a malfunction has occurred. Either the
unit didn’t start or the voltage or frequency is incorrect.
Correct the problem before continuing.
5. About 15 seconds after the generator (alternate
source) acceptable light comes on, the automatic
transfer switch should transfer the load from the utility
to the generator. At that time the Transfer Switch on
generator light should come on.
6. The generator will stay connected to the load for
about 5 minutes at which time the transfer switch will
transfer the load back to the utility. At the time it
transfers back to utility the Transfer Switch on Utility
light should come on and the Transfer Switch on
generator light should go out. To bypass this five
minute time delay you can press and release the Push
to Test button again at any time.
7. After the load retransfers to the utility the generator
will continue to run for about 1 minute (without a load)
and then shut down. The Generator acceptable light
will go off indicating the generator set has shut down.
Once you are finished testing the transfer switch, this
completes your installation and unit testing. ALWAYS
leave the system in automatic mode unless servicing the
unit. For automatic operation, keep the generator set
mode switch in the “AUTOMATIC” position.
GENERATOR EXERCISER CIRCUIT
The automatic generator exerciser is configured to
automatically exercise to generator for 20 minutes once
every fourteen days .
In order to set and test the exercise circuit the genera-
tor set mode switch must be in the “AUTOMATIC”
position.
SETTING THE EXERCISER CIRCUIT
Press and release the Automatic Generator Exerciser
button. After about 8 seconds the exerciser light flashes
14 times to indicate that the exerciser circuit has been set.
The number of flashes indicates the number of days until
the next exercise period. This 20 minute period will occur
at approximately the same time of the day the button was
pressed.
DISABLING THE EXERCISER CIRCUIT
Press and hold the Automatic Generator Exerciser
button until the light above the button goes off, the light
flashes and then goes off.
ENABLING THE EXERCISER CIRCUIT
Press and hold the Automatic Generator Exerciser
button until the light goes off, the light flashes then goes
off. After about 8 seconds the exerciser light flashes
fourteen times to indicate that the exerciser circuit has
been re-enabled.
