Installation Manual 381333-445
ASCO 4ATE, 4ACTE, 4ADTE, 4NTE, 4NCTE, 4NDTE
381333-445 B
ASCO Power Technologies
Page 9
Isolating the ATS (to TEST Positon)
Isolating is required before any service work can be performed
on the automatic transfer switch. Refer to Figures 11-16.
NOTE:
Bypass Switch can be used for manual load
transfer to an available power source if transfer switch is
in the TEST or ISOLATE position.
1.
Bypass the closed ATS contacts. See
Bypassing the
ATS
on pages 7-8.
2.
Turn the
Connection / Isolation Handle
counter-
clockwise (about 9-10 turns) until the window shows
TEST
. The
TEST
light comes on. The ATS can be
tested/operated now without load interruption (see page 6).
Figure 11.
CONNECTED
to
TEST
position
Figure 12. The
TEST
light will illuminate
Figure 13. Connection / Isolation Handle
turned to the
TEST
position
NOTE:
In the TEST position the transfer switch
solenoid operator circuit is energized through secondary
disconnects
.
continued on next page
Transfer
Switch
position
window
options
CONN
TEST
ISOLATE
counterclockwise
draws out the
transfer switch
Turn crank
counter-
clockwise
until
window
shows
TEST.
