Installation Manual
ASCO 3ATS, 3ADTS, 3NTS, 3NDTS
381333-404 B
ASCO Power Technologies
Page 5
Figure 7. Four indicator lights.
2 – Voltage Checks
First check the nameplate on the transfer switch; rated voltage
must be the same as normal and emergency line voltages.
Use extreme caution when using a meter to
measure voltages in the following steps.
Do not touch power terminals; shock, burns, or
death could result!
Perform steps 1 through 6 at the right. Observe the indicator
lights. See Figure 7.
●
Black circle means the light is on.
○
White circle means the light is off.
* If necessary, adjust the voltage regulator on the generator
according to the manufacturer’s recommendations. The
transfer switch will respond only to the rated voltage specified
on the transfer switch nameplate.
Also see User’s Guide 381333-400 for voltage settings in the
controller.
1
Close the normal source circuit breaker. The
normal source accepted and the load on normal
lights should come on.
2
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages
present at the transfer switch
normal source terminals.
3
Close the emergency source circuit breaker.
(Start generator, if necessary.) The emergency
source accepted light should come on.
4
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages
present at the transfer switch
emergency source terminals.*
5
Use a phase rotation meter to
check phase rotation of
emergency source; it must be
the same at the normal
source.
6
Shut down the engine-generator, if applicable.
The emergency source accepted light should go
off. Then put the starting control selector switch
(on the generator set) in the automatic position.
Close the enclosure door.
Continue to
3 – Electrical Operation
on the next page.
Load on
Normal
Load on
Emergency
Normal Source
Accepted
Emergency
Source Accepted
Summary of Contents for 3ADTS
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