5. Depress the flux-shift trippers for all three phases.
6. Place the Phase Select switch into the B-PHASE
position.
7.
Repeat steps 2 through 5.
8. Place the Phase Select switch into the C-PHASE
position.
9. Repeat steps 2 through 5.
Setup – 1000% of minimum trip - ground: (TPG only)
1.
Verify that the settings of the tester and control are
as described in the
Initial Tester Setup
and
Initial Tri-
Phase/TPG Control Setup
sections of this bulletin.
2. Place the Ground Trip Block switch on the control board
into the OFF position.
3. Set the minimum trip level on the A-, B-, and C-Phases
of the control board to 690 A.
4. Place the 4-30 A, and 240 A Fault Current switches on
the VFI tester into the ON position, and the 1X/2X Fault
Current switch on the VFI tester into the 2X position.
All other Fault Current switches should be in the OFF
position.
5. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
6. While monitoring the fault current on the multimeter,
adjust the 4-30 A rheostat adjusting knob until the
multimeter reads 500 mA ± 35 mA.
7.
Press and release the Control Test button to terminate
flow of simulated fault current to the control.
8. Set the minimum trip level for Ground on the control
board to 50 A.
Test procedure – 1000% of minimum trip – ground (TPG
only):
1.
Place the Phase Select Switch into the A-PHASE
position.
2. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
3. When the control board issues a trip signal, the
A-Phase, B-Phase, and C-Phase flux-shift trippers
should operate, and the timer will stop.
4. Record the time displayed on the LCD, and compare it
with the 1000% entry in Table 2 for the timing card that
is used in the control board.
5. Depress the flux-shift trippers for all three phases.
6. Place the Phase Select switch into the B-PHASE
position.
7.
Repeat steps 2 through 5.
8. Place the Phase Select switch into the C-PHASE
position.
9. Repeat steps 2 through 5.
NOTICE
Equipment misoperation. The capacitors upon the Tri-
Phase and TPG boards will retain a charge of 20 Vdc
upon completion of control testing. Apply a 5 k ohm
resister between ground and the P1-7, P1-5, and P1-3
board terminals for 10 seconds prior to returning the
control to service. Failure to comply can result in false
tripping activity by the control upon reinstallation.
T318.0
SCADA board tests –TPG
Refer to Figure 10 for identification of individual SCADA
accessory board components referenced within the
following procedures.
IMPORTANT
Always wear a grounding wrist strap to control static
electricity before handling circuit boards. Attach wrist strap to
ground terminal located upon the front plate of the VFI unit.
Failure to use this strap may result in circuit board damage.
Fault target test
Setup
1.
Verify that the settings of the tester and control are
as described in the
Initial Tester Setup
and
Initial Tri-
Phase/TPG Control Setup
sections of this bulletin.
2. Place the Phase Instantaneous Trip switch on the
control board into the ON position.
Test procedure
1.
Place the 60 A Fault Current switch into the ON
position. Place all of the other Fault Current switches
into the OFF position.
2. Press and release the Control Test button to initiate the
test.
3. After the A-Phase flux-shift tripper operates, verify
that the A-Phase Fault Target on the SCADA board is
orange.
4. Place the 30 A Fault Current switch into the ON
position. Place all of the other Fault Current switches
into the OFF position.
5. Reset the target by pressing the Control Test button,
waiting 5 seconds, and then pressing the Control Test
button again. The A-Phase Fault Target should now be
black.
6. Place the Phase Select switch into the B-PHASE
position.
7.
Repeat steps 1 and 2.
8. After the B-Phase flux-shift tripper operates, verify
that the B-Phase Fault Target on the SCADA board is
orange.
Operating Instructions
MN285001EN December 2018
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