Wiring and connecting the power monitor – Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Master Module Installation Instructions User Manual
Page 18
18 Powermonitor 3000 Master Module
Publication 1404-IN007F-EN-P - November 2009
Wiring and Connecting the Power Monitor
Wiring of the power monitor includes the following steps:
• Connection of voltage and current signals from PTs and CTs
• Connection of control power
• Connection of status inputs and status/control outputs
• Communication wiring
Follow these guidelines to help assure reliable, trouble-free operation of your power monitor:
• Install and connect all wiring. Use wire tags to identify connections. Bundle wiring
neatly and maintain a minimum of 50 mm (2.0 in.) clearance from the master module
ventilation slots to avoid a buildup of heat within the unit.
• Furnish and install properly-selected fuses for voltage signals and control power.
• Use 600V wiring rated at 75 °C (167 °F) or higher. We strongly recommend the use of
flame-retardant wire rated VW-1 by Underwriters Laboratories.
• Use a shorting terminal block (you provide) for CT wiring, to permit servicing
connected equipment, such as the Powermonitor 3000 master module, without
de-energizing the power system.
• Use ring lugs or locking spade lugs for voltage and current connections to provide
additional wiring security and safety.
• Pay careful attention to correct phasing and polarity for proper operation.
• Connect the master module to a low-impedance earth ground by using its grounding
terminal and a dedicated grounding wire at least as large as the largest
current-carrying wire connected to the master module. Keep grounding wiring as
short as possible. To obtain maximum EMI immunity, the master module mounting
feet should make electrical contact with the mounting panel.
Refer to Mounting Considerations on
• Connect all equipment ground terminals (master module, PT, and CT secondary) to a
single point, low-impedance earth ground.
For information on wire sizes and types for grounding electrical equipment, refer to
Industrial Automation Wiring and Grounding Guidelines, publication
the
National Electrical Code published by National Fire Protection Association (NFPA).
ATTENTION
Only qualified personnel, following accepted safety procedures, should install, wire, and
service the power monitor and its associated components. 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.