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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.
1. After deenergizing both power sources, open the
enclosure door. Locate and remove the mainte-
nance handle from the clips on the left side of the
transfer switch frame. Insert the handle into the hole
in the molded hub on the left side of the operator.
See Figures 1–3 and 1–4 and Table B.
2.
Move the maintenance handle up or down as shown to
manually operate the transfer switch. It should operate
smoothly without any binding. If it does not, check for
shipping damage or construction debris.
Table B. Maintenance handle positions.
ATS Position
E
Normal
N
E
Emergency
N
handle
hub
frame
Figure 1-4. Maintenance handle operation and contact position indicators.
INSTALLATION
Functional Test
Handle
Indicators
up
E = O
upper contacts open
N = C
lower contacts closed
E = C
upper contacts closed
N = O
down
lower contacts open
UP closes the
Normal source
contacts (lower)
DOWN closes the
Emergency source
contacts (upper)
(continued)
left side of
transfer switch
maintenance
handle
storage clips
Figure 1-3. Maintenance handle & storage location.
3. Return the transfer switch to the Normal position.
Observe that the window indicators (right side) show
the top shaft O (open) and the bottom shaft C (closed).
Note: If Normal and Emergency connections are
reversed this operation is also reversed.
4. Remove the maintenance handle and store it on the
frame (left side) in the clips provided.
Verify that the maintenance handle
has been removed before proceeding!
Now continue to 2 – Voltage Checks on next page.
Emergency
contacts
window
indicators
O is open
C is closed
Normal
contacts
1---3
contact position
indicators (right side)
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