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IB01602007E
Instruction Bulletin
Page
22
Effective: June 2003
O&M Manual for
Non-Automatic Transfer
Switches (30 – 1200 Amperes)
If a transfer switch with any kind of electrical operating
capabilities is to be operated manually utilizing the manual
operating handle, it is strongly recommended that the
transfer motor circuit first be isolated. This is accomplished
by unplugging the (S3) plug marked motor disconnect
(Figure 21). Any attempt to operate the manual handle
without first isolating the motor circuit causes an automatic
transfer to the source indicated by the source selector switch.
5.3 Horizontal Design Operation
The horizontal design transfer switch utilizes a pivoting
rocker-arm lever which operates the circuit breaker handles
as the arm is moved by a rotating lever usually connected to
a transfer motor (Figure 16). A slide pin engaging a pivot in
the rotating lever converts rotary motion to linear motion.
To operate breaker manually or if the breaker trips, unplug
P3 from S3 to disconnect the motor circuit (Figure 21). Turn
and hold the break release lever to “HOLD FOR MANUAL
OPERATION” position, and then rotate the manual operator
knob in either direction to move the ATS into the desired
position. Let go of the brake release lever to re-engage the
motor. Connect P3 to S3 to return to normal operation.
If a transfer switch with any kind of electrical operating
capabilities is to be operated manually, it is strongly recom-
mended that the transfer motor circuit first be isolated.
This is accomplished by unplugging the disconnect link.
Any attempt to operate the manual handle without first
isolating the motor circuit causes an automatic transfer
to the source indicated by the source selector switch.
Figure 20. Indicator Wheel Indicating Neutral Position on
Vertical Design
Figure 21. Motor Disconnect Being Unplugged
NOTICE
NOTICE