8. Press and release the Tripper Test button to initiate the
test. The C-Phase flux-shift tripper on the VFI tester
should operate immediately.
9. Depress all of the flux-shift trippers on the VFI tester.
Upon completion of the internal Flux-Shift Tripper Test,
complete the initial set-up procedure as follows:
1.
Place the Test Select switch into the CONTROL TEST
position.
2. Place the Phase Select switch into the A-PHASE
position.
Initial Tri-Phase/TPG control setup
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.
Refer to Figures 8 and 9 for locations of individual control
switches referenced within the following procedures.
1.
Set the minimum trip levels on A-phase, B-phase, and
C-phase to 50 A.
2. Set the control board for Single Phase/Independent Trip.
3. Set the Ground Trip level to 50 A (TPG only).
4. Set the Ground Trip Block Switch in the ON position
(TPG only).
Instantaneous trip test - phase
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
VFI Tester Operation:
1.
Place the 4-30A and 30 A Fault Current toggle switches
into the ON position.
2. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
3. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
4. 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
50 A.
5. Place the Phase Select switch into the B-PHASE
position.
6. Repeat steps 2 through 4.
7.
Place the Phase Select switch into the C-PHASE
position.
8. Repeat steps 2 through 4.
9. Return the Phase Instantaneous Trip switch on the
control board into the OFF position.
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
Instantaneous trip test - ground (TPG only)
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 Ground Trip Block switch on the control board
in the OFF position.
3. Place the Ground Instantaneous Trip switch on the
control board into the ON position.
Test procedure:
1.
Set the minimum trip levels on A-, B-, and C-phase to
690 A while maintaining the Ground Trip level setting at
50 A.
2. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
3. Place the Phase Select Switch into the A-PHASE
position.
4. Turn the 4-30 A rheostat adjusting knob fully
counterclockwise.
5. Press and release the Control Test button to initiate
flow of simulated fault current to the control.
6. Slowly turn the 4-30 A rheostat adjusting knob
clockwise while monitoring the current value on the
multimeter.
7.
Verify that the A-Phase, B-Phase, and C-Phase flux-
shift trippers on the VFI tester operate when the fault
current exceeds 50 A.
8. Depress the flux-shift trippers for all three phases.
9. Place the Phase Select Switch to the B-PHASE
position.
10. Repeat steps 2 through 7.
Operating Instructions
MN285001EN December 2018
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