I.L.15.01.T.K.
Page 5
Effective June 2000
4. Equipment Description
4.1 “F-Frame”
Automatic
Transfer Switch
Rated 30 amperes through 150 amperes at
600 Volts AC and 200A at 240V maximum,
50 or 60 Hertz. The mechanism is a lever
operated device controlled by a 120 volt
unidirectional motor. The transfer motor
drives a cam that in turn operates a steel
lever by sliding a pin along a slot in the back
of the lever. The lever, in turn, operates the
two breaker handles. There are two micro
switches (NS/x, ES/x) inside the breakers
that are operated by the breaker’s main
contacts to provide switch status indication
to the automatic controller. The switch has
three operating positions. They are: the
normal breaker closed and the emergency
breaker open, the emergency breaker
closed and the normal breaker open or both
the normal and emergency breakers open.
The normal and emergency breakers can
never both be closed at the same time.
Figure 1
-
Typical Power Panel for 30-
200A models
The F-Frame switch can also be easily
manually operated. Remove the thumb
screw on the operating handle and place it
in a safe location. Then the lever can be
manually operated for whatever position
desired without interference by the
automatic control. For automatic control
again, simply align the hole in the motor arm
with the slot in the operating arm and
replace the thumb screw. The various
automatic control components are described
beginning in Section 6 titled “Description of
Operation”.
4.2 “K, L, M, N-Frame” Horizontal
Automatic Transfer Switch
A complete line rated from 200 through
1200
*
Amperes at 600 Volts AC 50 or 60
Hertz.
The transfer mechanism consists of the
transfer motor, a gear train and two breaker
operating cams.
Figure 2
-
Spur Gear Meshing
Relationship (Bottom View of Top Cover)
The transfer motor drives the centre gear
which in turn operates the two secondary
gears. There is a projection in the secondary
gears which slides in a groove in the
operating cams, moving the cams from side
to side. The breaker handles are set inside
two outer guides of the cam and are also
moved from side to side. There are two
micro switches (NS/x, ES/x) inside the
breakers that are operated by the breaker’s
main contacts to provide switch status
indication to the automatic controller.
The Horizontal type transfer switch has
three operating positions, the normal
breaker closed and the emergency breaker
open, the emergency breaker closed and
the normal breaker open or both the normal
and the emergency breakers open but never
both the normal and emergency breakers
closed at the same time. The switch is also
easy to operate manually. Simply remove
the motor disconnect plug and turn the
operating handle on the front of the transfer
mechanism in a counter clockwise direction
until you hear the breakers operated and the
indicator is in the desired position. There will
be no interference from the microprocessor
control. For automatic control, reconnect
the transfer motor plug and the transfer
switch will seek the source with power
available.
*
A 1200A Switch in the Horizontal design is provided as a
type “B” switch with overcurrent protection (Option 16N)
and rated for 80% continuous current.
