CR194 Two-High Vacuum Limitamp@ Control
OPERATION
CAUTION: Before proceeding with operation of
the equipment, insure that at this time the equip-
ment is still de-energized, that the isolation switch
handle is in the “OFF” (down) position (i.e. the
handle latch release pops back out), that the
equipment has passed the above Mechanical Op-
eration Check, Vacuum Interrupter Integrity Test
and Megger Check in their entirety, and that all
barriers are in place.
Operation Under Test Power
A complete electrical operation check of each control-
ler can be made without energizing the main incom-
ing power bus by using the standard test power circuit.
A wiring diagram that shows this test power circuit and
associated connection is included with the controller
when it is shipped from the factory. The customer
should connect his test power to the test power termi-
nals typically labeled “Purchaser’s Test Power”. The
controller should be put through its complete operat-
ing sequence,
in the test position, as a final check
before energizing the power bus.
The test power circuit is composed of a test power
interlock (TPI), which is shown in Figure 45, and a
Test-Normal selector switch (TSW), shown in Figure 7.
When the isolation switch operating handle is “off’,
the TPI interlock assembly is depressed and one of the
TPI interlocks opens the secondary circuit of the
control power transformer, thereby electrically isolat-
ing it. The TPI and TSW contacts are arranged in the
circuit so that the TSW switch must be in the “Test”
position and the isolation switch handle must be in the
“off’ position in order for the test power circuit to
function. By the same token, the TSW switch must be
in the “Normal” position and the isolation switch
handle must be in the “on” position for normal bus-
powered operation.
Refer to the wiring diagrams provided with the
equipment to determine the necessary test voltage
and frequency.
Normal Operation
Step 1.
Upon completion of the above items under “Opera-
tion”,
the equipment is now ready for energization.
Step 2.
Close the compartment doors and apply power to the
controller.
NOTE:
Zj the operating handle of the isolation switch cannot be
moved to the “QN”position, it may be that the mechanical inter-
lock device is preventing this movement. To move the handle to
the “ON” position, the high-voltage door must be fully closed
and the contactor must be open.
Step 3.
Move the isolation switch handle to the full “ON” posi-
tion by moving the handle with a rapid, positive mo-
tion to the extreme up position (i.e. the handle latch
release pops back out).
Step 4.
Operate the controller in the normal manner with the
pilot devices (usually push buttons) provided to check
the motor for proper
rotation.
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