Installation requirements

This device is intended for overvoltage applications of category II in industrial environments of pollution class 2 (as defined in IEC publication 60664-1).

The device must be mounted vertically as it contains a heat sink. Any other mounting angle will reduce the heat dissipation capability of the device and may result in premature failure of critical components.

The device can be mounted anywhere www.cniacs.com as long as the ambient temperature does not exceed the rated ambient conditions or clearance requirements.

Clearance requirements for CGCM equipment are

– 63.5 mm (2.5 inches) of clearance is required on both sides of the unit when mounted.

– 101.6 mm (4 in.) clearance is required above and below the unit when mounted.

Electrical Connections

The connection of the CGCM device depends on the application and the excitation programme. It is not possible to use all inputs or outputs in a given installation. Incorrect wiring may result in damage to the equipment.

Connect the terminals of the CGCM unit with copper wire rated at no less than 600V. General purpose wire rated for a minimum temperature of 105 °C (221 °F) may be used.

All wire must be copper. Select circuit wires according to good design practice.

The wire gauge ranges listed in the terminal block label instruction table indicate the physical capabilities of the connector.

Terminals for CGCM devices are located on the front, bottom, and right side panels of the device.

The nine-pin connector on the bottom of the unit is used for communication between CGCM devices in a redundant system. The recommended torque for the terminal screws is 1 N-m (9 lb-in).

Terminals that are used as shield wire landings are found on multiple terminal strips. Shielded terminals with the same name are connected together internally, but are not connected to a protective ground or any internal device circuit.

Excitation power supply

The excitation power supply is connected to the PMG terminals whether it is connected to the generator output (parallel excitation) or to the PMG.

The shunt excitation input is connected to the voltage transformer (VT).

The PMG inputs are located on TB1 and are labelled PMG A, PMG B and PMG C, indicating the respective phase relationship.

The single-phase excitation power supply must be connected to terminals PMG A and PMG C. The PMG inputs require twisted pair connections.

A twisted pair shielded cable is required for the PMG input.