S&C Instruction Sheet 712-501
21
Inspection Recommendations
Figure 25. Selector handle operation.
Coupling and Decoupling the Switch
Operator for Inspection
Step 18
Using the selector handle:
The selector handle is used to couple and
decouple the motor from the operating shaft .
Decoupling the motor allows the user to install
and configure control schemes and inspect the
operation of the motor without opening and
closing the interrupters or dis connect .
To decouple:
The integral external selector handle, for oper-
ation of the built-in internal decoupling mech-
anism, is located on the right-hand side of the
switch operator enclosure . See Figure 25 .
NOTICE
While the decoupling mechanism is in use,
the motor-circuit source leads are momen-
tarily disconnected and both the opening and
closing motor contactors are mechani cally
blocked in the open position .
a . Swing the selector handle upright and
slowly rotate it clockwise 50 degrees to the
decoupled position . See Figure 25 .
During selector handle operation, which
includes the position at which actual disen-
gagement (or engagement) occurs, the
motor-circuit source leads are momentarily
disconnected and both the opening and
closing motor contactors are mechanically
blocked in the open position .
b . Lower the selector handle to engage the
locking tab . The switch operator may now
be operated either manually or electrically
without operating the Circuit-Switcher . The
trip circuit and charging motor circuit are
disabled and the switch operator output
shaft is prevented from moving by a
mechanical locking device located within
the switch operator enclosure .
Locking tabs
Coupled
Decoupled
50°
Selector handle
(being turned to decoupled
position)
Summary of Contents for Mark VI
Page 28: ...Printed in U S A ...
