6
OPERATING INSTRUCTIONS
MN280067EN July 2017
Type MET electronic recloser control tester operating instructions
2. Control settings:
A. Form 2, Form 3 and Form 3A controls: place a
shorting jumper across the A phase-trip resistor
to disable the phase trip function while checking
the ground trip operation,and check that Phase
Selector switch S5 is also set to A.
B. Form 4A and Form 4B controls: program the phase
minimum trip level to, at minimum, 2 times (200%)
the ground minimum trip level.
3. Energize the tester by placing the ON/OFF Power
switch S1 to ON. The green Recloser Simulator-Open
lamp will light.
4. Set the Ammeter Range switch S4 to the milliamp
range equivalent to the programmed ground
minimum-trip level.
5. While holding the Fault Current switch S2 in
CALIBRATE, advance the Fault Current Adjust control
TR1 to approximately 125—150% of the minimum-trip
rating. Release S2.
6. Set the Time Selector switch S3 to RECLOSER
CLEARING, place Display Mode switch, S11, to
UPDATE and the Auto Reset switch, S12, to ON. Reset
the timer.
7. Move the Manual Control switch to CLOSE and release.
The simulator will close in approximately 3/4 second;
green OPEN light off, red CLOSED light on.
8. Set the Fault Current switch S2 to TEST and compare
the number of fast and delayed operations to lockout
with the actual settings of the electronic control.
9. Return the control and tester settings to INITIAL
CONDITIONS; Form 3 family controls, remove the
shorting jumper from across the A-phase-trip resistor;
Form 4 family controls, re-program the phase minimum
trip level to its original level.
IMPORTANT
Form 2 and Form 3 family controls–when checking the
minimum trip for either phase or ground on controls
equipped with the sequence-coordination accessory,
remove both fast TCC timing plugs to prevent the
sequence relay from inadvertently advancing without
tripping the recloser simulator .
Minimum-trip test (phase)
To check the phase minimum-trip-current setting of the
control, proceed as follows:
1. Check that the control and tester settings are as
specified under INITIAL CONDITIONS.
2. Form 3 family controls only: to prevent overshooting
while raising the test current to the minimum-trip
level, remove the timing plug from socket 1 to provide
instantaneous trip.
3. Check to make sure that the control is programmed for
at least one fast phase trip operation.
4. Set the control switches to GROUND TRIP
BLOCK to disable the ground trip function and to
NON-RECLOSING to provide one shot to lockout.
5. Energize the tester by setting the ON-OFF Power
switch S1 to ON. The green Recloser Simulator-Open
lamp will light.
6. Set the Ammeter Range switch S4 to the appropriate
range for the expected minimum-trip current.
7. Move the Manual Control switch to CLOSE and release.
The simulator will close in approximately 3/4 second;
green OPEN light off, red CLOSED light on.
8. Apply fault current.
A. Form 2 and Form 3 family controls: Set Fault
Current switch S2 to TEST and advance
Fault-Current Adjust control TR1 from 0 while
observing the ac Ammeter reading.
B. Form 4 family controls: Set Fault Current switch S2
to TEST and advance Fault-Current Adjust control
TR1 from 0 while observing the control’s Current
Above Minimum Trip indicator, note the current
recorded by the Ac Ammeter at the point where
the indicator displays.
9. Set Fault-Current switch S2 to OFF.
10. Repeat steps 7, 8, and 9 with Phase Selector Switch
S5 set at B and at C to check the other two phase
minimum trip levels.
11. Form 3 family controls only: Replace the timing plug in
its socket and return the control and tester settings to
INITIAL CONDITIONS.
Minimum-trip test (ground)
To check the ground minimum-trip current setting of the
control, proceed as follows:
otee:
N
To enable testing the ground-fault circuits of early
Form 2 controls (below serial number 1615), a special
test hookup is required. See Appendix C.
1. Check that the control and tester settings are as
specified under INITIAL CONDITIONS.
2. Control settings.
A. Form 2, Form 3 and Form 3A controls: place a
shorting jumper across the A phase-trip resistor
to disable the phase trip function while checking
the ground trip operation, and check that Phase
Selector switch S5 is also set to A.
B. Form 4A and Form 4B controls: program the phase
minimum trip level to, at minimum, 2 times (200%)
the ground minimum trip level.
