Rockwell Automation 1405-M620 Operating Instructions - Manual (Page 2)

Publication 1405-IN002C-EN-P - November 2004
2 Bulletin 1405 (M620) Operating Instructions
External connections to the instrument are terminated on plug-in
connector blocks with spring-clamp wire terminals, at the rear of the
instrument. Phase voltage connections are terminated on a 7-pin
connector block. Another 12-pin connector block is used for the
current transformer inputs, and alarm and energy pulse relay outputs.
The instrument’s operating power supply is drawn from a separate
120V or 240V ac power supply input, through an additional 3-pin
connector block. An optional 400V or 480V version of the unit is
available with operating power drawn from two of the phase voltage
input lines (L1 - L2). Therefore the M620 can be used with either
3-wire (3 phase) or 4-wire (3 phase and neutral) power systems.
The M620 is a compact instrument, with a 96 x 96 mm front panel,
and a depth of approximately 85 mm.
Installation Only qualified personnel should install and wire this equipment. Refer
to the following safety guidelines prior to installation.
Only qualified personnel, following accepted safety
procedures, should install and wire the
MiniPowermonitor. Before beginning any work,
disconnect all sources of power and verify that they
are de-energized and locked out. Failure to follow
these instructions may result in personal injury or
death, property damage or economic loss.
Never open a current transformer (CT) secondary
circuit with primary current applied. Wiring between
the CTs and the MiniPowermonitor 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.
ATTENTION
ATTENTION