Cool Automation CoolMaster 3000T Spécifications télécharger pdf (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 page 12

for additional information.

• 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 1770-4.1

, or 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.

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Cool Automation CoolMaster 3000T Spécifications Page 18