INSTALLATION
(continued)
1--3
Functional Test
The Functional Test consists of three checks: manual
operation, voltage checks, and electrical operation.
Do these checks in the order presented to
avoid damaging the automatic transfer switch.
!
Read all instructions on the Wiring Diagram and labels
affixed to the automatic transfer switch. Note the control
features that are provided and review their operation
before proceeding.
1 – Manual Operation Test
A detachable maintenance handle is provided on the frame
of 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.
!
Table B. Maintenance handle positions.
ATS Position
Indicators
Normal
E
N
OPEN
upper contacts open
CLOSED
lower contacts closed
Emergency
E
N
CLOSED
upper contacts closed
OPEN
lower contacts open
Turn counterclockwise
to Emergency.
Turn clockwise
to Normal.
insert
handle
into hole
Grasp
handle
firmly
slide hub
onto shaft
Figure 1-3. Maintenance handle.
1. After deenergizing both power sources, open the
enclosure door. Locate and remove the maintenance
handle and hub stored on the transfer switch frame.
Then install the hub onto the center operator shaft and
insert the handle firmly into the hole in the side of the
hub (spring fully compressed). See Figure 1–3 and 1–4
and Table B.
2. If the transfer switch is closed on Normal (window shows
CLOSED
), grasp handle firmly and turn it counterclock-
wise. The transfer switch should operate smoothly
without binding. If it does not, check for shipping
damage or construction debris.
3. Turn the handle clockwise to return the transfer switch to
the Normal position. Observe that the window indicators
(left side) show the top shaft
OPEN
and the bottom shaft
CLOSED
.
Note: If Normal and Emergency connections are
reversed this operation is also reversed.
4. Remove the maintenance handle and hub and store it on
the frame in the place provided.
Verify that the maintenance handle and hub
have been removed before proceeding!
!
Now continue to
2 – Voltage Checks
on next page.
clockwise DOWN closes
the Normal source contacts
(lower) and opens the
Emergency source
contacts (upper)
counterclockwise DOWN
closes the Emergency
source contacts (upper)
and opens the Normal
source contacts (lower)
window
indicators
OPEN
or
CLOSED
Emergency
contacts
Normal
contacts
contact position
indicators (left side)
Figure 1-4. Contact position indicators and maintenance handle operation.