Emerson ASCO 185 - Manual (Page 8)

FUNCTIONAL TEST Series 185
6 381333–319 D
After installing the Series 185 automatic transfer switch
(ATS) perform the following three–part functional test.
1 --- Manual Operation
A handle is provided on the transfer switch for
maintenance purposes only. Manual operation of the
transfer switch should be checked before it is energized
(operated electrically).
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
1. Turn OFF both the utility and generator circuit
breakers feeding the ATS. Verify that ALL POWER
IS OFF!
2. 100–230 A
Grasp the maintenance handle and turn it quickly
with your thumb and fingers to manually operate the
transfer switch.
260–400 A
Insert the maintenance handle into the hole in the
shaft, left side of the operator. Move the handle as
shown to manually operate the transfer switch.
3. The switch should operate smoothly without binding.
If it does not, check for shipping damage or
construction debris.
4. After checking the manual operation, use the handle
again to return the transfer switch to the utility
source position.
100–230 A
see Figure 8.
The letter P (utility) on the round weight is facing
you.
260–400 A
see Figure 9.
The letter N (utility) on the round weight is facing
you.
Remove the maintenance handle and store it on the
transfer switch in the place provided.
260–400 A Remove the maintenance handle
before proceeding!
2 --- Voltage Checks
The ATS is rated for 220–240 V ac 60 or 50 Hz. Verify that
both the utility and generator sources are 220–240 V ac 60
or 50 Hz.
maintenance handle
With ALL POWER OFF
grasp maintenance
handle and turn it
quickly with your
thumb and fingers.
weight marked P (utility) and A (generator)
Figure 8. Maintenance handle for 100–230 A.
maintenance
handle
shaft
hole
Figure 9. Maintenance handle for 260–400 A.
3 --- Electrical Operation
This procedure checks the electrical operation of the ATS.
1. Install the enclosure cover and tighten the screws.
2. Verify that the generator battery is connected and
that the generator’s starting controls are set for
automatic.
3. Turn on both the utility and generator circuit breakers.
4. Verify that the Utility Acceptable and Load on Utility
lights are on.
5. This step will start the generator. Press and hold the
Transfer Test button until the Generator Acceptable
light comes on and stays on. Then release the button.
6. After the Generator Acceptable light comes on, the
ATS transfers the load from the utility to the
generator (after approx. 10 second delay). The Load
on Generator
light comes on.
7. The ATS stays connected to the generator for
5 minutes (approx.). The utility must be acceptable
for 5 minutes continuously. Then the load is
transferred back to the utility. To bypass time delay,
press the Bypass Time Delay button.
8. After load retransfer to utility, the generator runs
2 minutes (without load), then shuts down. The
Generator Acceptable
light goes off indicating that
the generator is off.
This completes the Functional Test.