Emergency minimum trip multiplier test
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.
TPG control setup – 2X minimum trip multiplier test (100 A)
1.
Place the Phase Instantaneous Trip switch into the ON
position.
2. Set the emergency trip multiplier switches for A-Phase,
B-Phase, and C-Phase for 2X (.2X + .8X +1X default).
Test procedure – 2X minimum trip multiplier test (100 A)
1.
Place the 4-30 A, 30 A, and 60 A Fault Current toggle
switches on the VFI tester into the ON position. All
other Fault Current switches should be in the OFF
position.
2. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
3. Place the Phase Select Switch on the VFI tester into
the A-PHASE position.
4. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
5. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the A-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
100 A (2X the minimum trip setting of 50 A).
6. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
7.
Place the Phase Select Switch on the VFI tester into
the B-PHASE position.
8. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
9. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the B-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
100 A (2X the minimum trip setting of 50 A).
10. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
11. Place the Phase Select Switch on the VFI tester into
the C-PHASE position.
12. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
13. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the C-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
100 A (2X the minimum trip setting of 50 A).
Control setup – 5X minimum trip multiplier test (250 A)
1.
Set the emergency trip multiplier switches for A-Phase,
B-Phase, and C-Phase for ‘5X’ (.8X + 3.2X +1X default).
Test procedure – 5X minimum trip multiplier test (250 A)
1.
Place the 4-30 A and 240 A Fault Current switches
on the VFI tester into the ON position. All other Fault
Current switches should be in the OFF position.
2. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
3. Place the Phase Select Switch on the VFI tester into
the A-Phase position.
4. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
5. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the A-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
250 A (5X the minimum trip setting of 50 A).
6. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
7.
Place the Phase Select Switch on the VFI tester into
the B-Phase position.
8. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
9. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the B-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
250 A (5X the minimum trip setting of 50 A).
10. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
11. Place the Phase Select Switch on the VFI tester into
the C-Phase position.
12. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
13. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter. Verify that the C-Phase flux-shift tripper on
the VFI tester operates when the fault current exceeds
250 A (5X the minimum trip setting of 50 A).
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
Operating Instructions
MN285001EN December 2018
13
