Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Master Module Installation Instructions - Manual (Page 19)

Powermonitor 3000 Master Module 19
Publication 1404-IN007F-EN-P - November 2009
Wiring the Master Module
Observe all wire lug sizes and screw torques for terminal blocks wire sizes and screw torques.
Refer to Specifications on page 56 .
Voltage and Current Inputs
The following sections give information on the selection of PTs and CTs.
Voltage Input and PT Selection
The power monitor is designed to connect directly to a power system rated up to 600V
line-to-line (347V line-to-neutral). Higher system voltages require the use of user-supplied
PTs. Typical secondary voltage on a PT is 120V AC. Select the PT primary voltage to match
the nominal voltage of your power system.
Connect short circuit protection, that you supply, between the power system and the power
monitor. If PTs are used, install short circuit protection on the high-voltage side of the PTs.
Current Inputs and Current Transformer (CT) Selection
The current input on the power monitor is designed for a 5 A nominal current signal.
User-supplied CTs are required to connect your power system to the input of the power
monitor. Select the CT primary current to match the nominal current of your power system.
ATTENTION
Never open a current-transformer secondary circuit with primary current applied. Wiring
between the CTs and the power monitor should include a shorting terminal block in the
CT secondary circuit. Shorting the secondary with primary current present allows other
connections to be removed if needed. An open CT secondary with primary current applied
produces a hazardous voltage, which can lead to personal injury, death, property
damage, or economic loss.