Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 21)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 21
Install the PowerMonitor 5000 Unit Chapter 2
Voltage Sensing
Circuits rated up to 690V AC line-to-line can be connected directly. Higher
voltages require potential transformers (PTs), also known as voltage transformers
(VTs), to step the voltage down.
Wiring must conform to all applicable codes and standards. In particular, suitable
overcurrent protection must be provided by the user, with current and
interrupting ratings selected to protect the wiring.
Pay particular attention to correct phasing and polarity of voltage connections.
The diagrams use the ‘dot’ convention to indicate transformer polarity. The dot
indicates the H1 and X1 terminals on the high side and low side of the
transformer respectively.
When wiring a PowerMonitor 5000 unit to existing PTs and metering devices,
the voltage sensing terminals of the PowerMonitor 5000 unit must be connected
in parallel with the voltage sensing terminals of the existing metering devices.
Table 5 - Selecting Wiring Diagrams and Metering Modes
Circuit Type Line - Line Voltage No. of CTs No. of PTs Voltage Sensing Current Sensing Metering_Mode
3-phase, 4-wire Wye ≤690 V 3 - Diagram V1 Diagram I3 Wye
> 690 V 3 Diagram V3
3-phase, 3-wire
grounded Wye ≤690 V - Diagram V2
> 690 V 3 Diagram V5
3-phase, 4-wire
impedance grounded
Wye ≤690 V - Diagram V1
> 690 V 3 L-N Diagram V3
3 L-N, 1 N-G Diagram V4
3-phase, 3-wire Delta
or ungrounded Wye
≤690 V
2 - Diagram V2 Diagram I2 Delta 2 CT
3 Diagram I3 Delta 3 CT
> 690 V 2 2
(3)
Diagram V6 Diagram I2 Open Delta 2 CT
3 Diagram I3 Open Delta 3 CT
Split-phase/Single-
phase
(1)
≤690 V
2/1 - Diagram V7 Diagram I1 Split-phase
> 690 V 2/1 2/1 Diagram V8
3-phase, 3-wire Delta,
Grounded B Phase
(2)
≤690 V
2 - Diagram V9 Diagram I2 Delta Grd B Ph 2 CT
3 - Diagram I3 Delta Grd B Ph 3 CT
3-phase, 4-wire high-
leg
(2)
(wildcat)
≤690 V 3 - Diagram V10 Diagram I3 Delta High Leg
For demo use - - - - - Demo
(1) For true single-phase circuits, connect only V1 to N and wire the CT to I1. Use only the Phase 1 results.
(2) Delta Grounded B Phase and Delta High-Leg are not supported above 690 V L-L. Use the 3-phase, 3-wire Delta circuit type.
(3) 2 PTs used in open-delta configuration.