Rockwell Automation 1405-M620 Operating Instructions - Manual (Page 4)

NC NC L3
L1
L1 N
N
GND
GND
L2
Aux. Supply
Current Inputs
Voltage Inputs
(120V or 240V only)
M620
- - -
Pins 2 and 4 (counting from the left side) of the 7-pin
connector are not used: no external wires should be
connected to these terminals!
Publication 1405-IN002C-EN-P - November 2004
4 Bulletin 1405 (M620) Operating Instructions
CT Connection: Careful consideration should be given when
connecting the secondary of the CT to the current inputs of the
MiniPowermonitor. Extended lengths of connection wire will cause
the VA rating of the CT to increase and will create higher common
mode input voltage. It is recommended that the wire size be selected
to limit the impedance to 200 milliohms. Exceeding this limit may
cause current readings to become less accurate when using a star
connection.
Aux Supply: With this option, instrument power is supplied by a
separate 120V or 240V line, independent of the measured power lines.
A third connector block (3-pin, spring-clamp terminals type) is added
at the rear with this option.
TIP