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IB 6.2.11.1-1C
Page 19
Figure 10 - Shunt Trip Adjustment
2. Rotate the adjusting screw counterclockwise until it
is not possible to turn it further, DO NOT FORCE.
3. Rotate the screw clockwise approximately three (3)
full turns.
4. Remove all tools from the breaker.
operation of the shunt trip device after charging and
closing the breaker. Apply the required voltage to pins
4(+) and 2(-) of the circuit breaker secondary
disconnect plug "A".
Close Coil Adjustment (Refer to Figure 11)
Note: This procedure should only be performed when
the close coil has malfunctioned or been replaced.
Caution: Perform this procedure only on an open circuit
breaker with its closing springs discharged.
1. The circuit breaker must be lying on its back or on a
cart which allows safe access to the close coil. Locate
the close coil adjusting screw under the breaker.
2. Rotate the adjusting screw until gap "C" between the
end of the plunger and the close latch is approximately
3/16" inches.
3. Remove all tools from the breaker and place the
breaker in an upright position. Test the operation of the
close coil device after charging the breaker. Apply the
required voltage to terminals 3(+) and 5(-) of the circuit
breaker secondary disconnects.
Magnetic Latch Device
"C"
The magnetic latch device in K-Line Plus breakers
does not require adjustment.
PROCEDURE FOR FIELD TESTING THE
MPSC-2000 SOLID STATE TRIP SYSTEM
Test the
There are two ways to evaluate the MPSC-2000 solid
state trip system: primary current injection through the
breaker main contacts; and secondary current injection
directly into the trip device. Either method will test the
trip device;
testing the current sensors and magnetic latch also.
The following is a procedure for performing this field
testing.
Notes:
1. Refer to time current curves TD-9651, TD-9652, and
TD-9653.
2. When checking calibration, disable the functions not
being tested, or set them at their highest threshold and
delay values. It is especially important to disable
the Ground function when testing the other
elements to prevent false tripping.
3. The circuit breaker must be closed before each test
below.
4. Following each test, check the MPSC-2000 event
register to ensure that the correct element tripped the
breaker, especially if test results appear to be incorrect.
5. Reference bulletin IB 6.1.2.8-1A for instructions on
setting the MPSC-2000.
Figure 11 - Close Coil Adjustment
primary injection has the advantage of
ABB
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