Special wiring modes, 1pt 1ct line-to-line – Rockwell Automation 1408-EMxx PowerMonitor 1000 Unit User Manual
Page 17
PowerMonitor 1000 Unit 17
Rockwell Automation Publication 1408-IN001E-EN-P - September 2013
You can use two CTs only on three-wire systems.
Single-phase, Two-current Transformers
Special Wiring Modes
There are two special wiring modes for the power monitor.
1PT 1CT Line-to-line
This special wiring mode is designed for use in capacitor bank controllers. Traditional capacitor
bank control measures VBC and IA to calculate reactive power and power factor. In this mode,
the power monitor returns values as if it were configured in Delta mode. Three-phase values are
estimated assuming a balanced load.
The following wiring diagram indicates the connections for the 1PT 1CT Line-to-line mode. A
PT must be used. Wiring diagnostics are disabled in this mode.
Line
Load
Ground
L1
L2
N
Voltage Mode = Any
CTs (by user)
Shorting Terminal
Block (by user)
PowerMonitor 1000 Unit
I1+
I1-
I2+
I3+
I2-
I3-