Top-hinged VFI units with TPG controls/all Tri-
Phase controls
1.
Remove the pad-mounted unit from service.
2. Attach the power cable to the VFI tester and plug it into
a grounded, three-prong 120 VAC outlet.
3. Connect the 14-pin female/18-pin male interrupter
interface cable (Item 1) to the VFI tester at the
interrupter port. Refer to Figure 7 for steps 3 through 17.
WARNING
Hazardous voltage. Open the switch associated with the
control before attempting to disconnect its control cable.
Failure to do so can result in contact with high voltage
pulse (300 V peak) from the CT protection circuit, which
can cause death or severe personal injury.
T287.0
4. Break the connection between the control and VFI unit
by carefully disconnecting the internal VFI control wiring
harness (Item 2) at the control.
NOTICE
Equipment damage. Use care while disconnecting and
reconnecting cables to the Tri-Phase/TPG control. Do
not misalign male and female connectors or allow the
full weight of the tester cable to be transferred to the
Tri-Phase/TPG board. Failure to comply can result in
damage to the board header and possible equipment
misoperation.
T319.0
5. Connect the 18-pin male connector end of the VFI
tester interrupter interface cable (Item 1) to the
18-pin female end of the VFI control wire harness
(Item 2).
6. Place the Phase Test Selector switch on the VFI tester
into the EXTERNAL TRIPPERS position.
7.
Some three-phase ganged VFI assemblies are built
with a single flux -tripper mounted on the "B" phase
mechanism. Others have a flux-shift tripper mounted on
the mechanism for each phase. Determine which type
is being tested, and test accordingly.
8. If the VFI assembly being tested has a flux-shift tripper
mounted on the A-Phase mechanism, place the Phase
Selector switch into the A-PHASE position. If it does
not, proceed to step 11.
9. Energize the tester by setting the power switch to ON.
10. Press the Tripper Test button. The A-Phase flux-
shift tripper in the padmount unit should operate
immediately.
11. Place the Phase Selector switch into the B-PHASE
position.
12. Press the Tripper Test button. The B-Phase flux-shift
tripper in the pad-mounted unit should operate
immediately.
13. If the VFI assembly being tested has a flux-shift tripper
mounted on the C-Phase mechanism, place the Phase
Selector switch into the C-PHASE position. If it does
not, proceed to step 15.
14. Press the Tripper Test button. The C-Phase flux-shift
tripper in the pad-mounted unit should operate
immediately.
15. De-energize the tester by setting the power switch to
OFF.
16. Disconnect the 18-pin male connector end of the
VFI tester interrupter interface cable (Item 1) from
the 18-pin female end of the VFI control wire harness
(Item 2).
17. Carefully reconnect the internal VFI control wiring
harness (Item 2) to the control board header.
18. Disconnect the 18-pin male connector end of the
VFI tester interrupter interface cable (Item 1) from the
VFI tester.
19. Using a hotstick, close in all three phases on the pad-
mounted unit.
INPUT
POWER
120 VAC
TEST
CONTROL
RESET
TEST
Power Systems
A
B
P
L
N
C
D
M
F
E
BATTERY
CONNECTOR
CONTROL
EXTERNAL
INTERNAL
TO CONTROL
TO INTERRUPTER
PHASE SELECT
TEST SELECT
METER JACKS
CURRENT
TRIPPER TEST
BATTERY TEST
4-30A
30A
60A
120A
240A
1X
4-30A
2X
CONVENIENCE
OUTLET
120 VAC
C-PHASE TRIPPER
B-PHASE TRIPPER
A-PHASE TRIPPER
TEST
TRIPPERS
TRIPPERS
T
V
P
S
R
U
N
L
M
A
Tester
VFI
ON
ON
ON
ON
ON
AØ
BØ
CØ
Tri-Phase/
TPG Board
Item 1
Interrupter
Interface
Cable
18-pin recessed
male connector
18-pin female
connector
Item 2
VFI
Control
Wire
Harness
Figure 7. Connection of the VFI tester to top-hinged VFI
units with TPG controls and all VFI units for external
flux-shift tripper test.
Operating Instructions
MN285001EN December 2018
19
