11. Place the Phase Select Switch to the C-PHASE
position.
12. Repeat steps 2 through 7.
13. Return the minimum trip levels on A-Phase, B-Phase,
and C-Phase on the control board to 50 A.
14. Place the Ground Trip Block switch on the control board
to the ON position.
15. Place the Ground Instantaneous Trip switch on the
control board into the OFF position.
Time current curve (TCC) trip test - phase
Setup – 150% of minimum trip - phase:
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 4-30 A and 60 A Fault Current switches on
the VFI tester into the ON position. All other Fault
Current switches should be in the OFF position.
3. Place the Phase Select Switch on the VFI tester into
the A-PHASE position.
4. Set the minimum trip level for A-Phase on the control
board to 690 A. This prevents the control from issuing a
trip signal when calibrating the fault current.
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 75 mA ± 5 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 A-Phase on the control
board to 50 A.
Test procedure – 150% of minimum trip - phase:
The Phase Minimum-Trip test is performed as follows:
1.
Press and release the Control Test button to initiate
flow of simulated fault current to the control.
2. Upon operation of the flux-shift tripper record the time
displayed on the LCD, and compare it with the 150%
entry in Table 2 for the timing card that is used in the
control board.
3. Place the Phase Select switch into the B-PHASE
position. Repeat steps 2 and 3.
4. Place the Phase Select Switch on the VFI tester into
the C-PHASE position. Repeat steps 2 and 3.
Setup – 300% of minimum trip - phase:
1.
Place the 4-30 A and 120 A Fault Current switches
on the VFI tester into the ON position. All other Fault
Current switches should be in the OFF position.
2. Place the Phase Select Switch on the VFI tester into
the A-PHASE position.
3. Set the minimum trip level for A-Phase on the control
board to 690 A. This prevents the control from issuing a
trip signal when calibrating the fault current.
4. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
5. While monitoring the fault current on the multimeter,
adjust the 4-30 A rheostat adjusting knob until the
multimeter reads 150 mA ± mA.
6. Press and release the Control Test button to terminate
flow of simulated fault current to the control.
7.
Set the minimum trip level for A-Phase on the control
board to 50 A.
Test procedure – 300% of minimum trip - phase:
1.
Press and release the Control Test button to initiate
flow of simulated fault current to the control.
2. Upon operation of the flux-shift tripper record the time
displayed on the LCD, and compare it with the 300%
entry in Table 2 for the timing card that is used in the
control board.
3. Place the Phase Select switch into the B-PHASE
position. Repeat steps 2 and 3.
4. Place the Phase Select Switch on the VFI tester into
the C-PHASE position. Repeat steps 2 and 3.
Setup – 1000% of minimum trip - phase:
1.
Place the 4-30 A, 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.
Table 2. Acceptable Control Response Time Range for TCC Tests
Percentage of Test Current
Acceptable Control Response Time Range for TCC Tests
EF Curve
KF Curve
TF Curve
H Curve
F Curve
150%
3.484-6.461 sec
16.632-43.509 sec
23.696-47.054 sec
2.023-3.182 sec
2.200-3.361 sec
300%
0.532-0.838 sec
0.586-0.895 sec
1.645-2.863 sec
0.441-0.726 sec
0.476-0.762 sec
1000%
0.058-0.087 sec
0.038-0.070 sec
0.193-0.279 sec
0.032-0.052 sec
0.112-0.132 sec
ote:
N
These timing ranges represent ± 10% in current or time, or ±10ms, whichever is greater.
Operating Instructions
MN285001EN December 2018
9
