Allen-Bradley 1420-V1, User Manual, Page: 20 / 90

20 Rockwell Automation Publication 1420-UM001E-EN-P - March 2016
Chapter 2 Installation and Wiring
These diagrams are simplified. Wiring of the power monitor must comply with
all applicable codes, standards, and regulations. Protect voltage and control
power wiring with suitable overcurrent protection. Connect current transformer
(CT) secondary wiring through a suitable shorting terminal block.
Figure 11 - 3-phase, 2-wire Wye, Balanced Load
Figure 12 - 3-phase, 4-wire Wye, Unbalanced Load
IMPORTANT
In these diagrams, ‘balanced load’ configurations permit 3-phase
measurement by using only one phase connection. Unbalance in the measured
circuit affects the accuracy of the measurements.
Line
L 1 N
Fuse
PT
(VT )
Load
Ground
Shorting
terminal block
S 1
I1
Ground
CT
1
L 2 L 3
L 1
S 2
N
Line
L 1 N
Fuse
Load
Ground
Shorting
terminal block
S 1
I1
CT
1
L 2
L 3
L 1
S 2
N
PM 500 PM 500
1-CT Connection 1-CT and 1-PT/VT Connections
Meter Configuration: System = 3P.2
Line
L 1 N
Fuse
PT 1
(VT 1)
Load
Ground
Shorting
terminal block
S 1
I1
Ground
CT
1
L 2 L 3
L 1
S 2
PM 500
3-CT and 3-PT/VT Connections
S 1
I2
CT
2
S 2
S 1
I3
CT
3
S 2
Fuse
PT 2
(VT 2)
L 2
Fuse
PT 3
(VT 3)
L 3
N
Line
L 1 N
Fuse
Load
Ground
Shorting
terminal block
S 1
I1
CT
1
L 2 L 3
L 1
S 2
PM 500
3-CT Connection
S 1
I2
CT
2
S 2
S 1
I3
CT
3
S 2
Fuse
L 2
Fuse
L 3
N
Meter Configuration: System = 3P.n