Project Design and Installation

Installation Requirements

The relay unit must be installed in a location where the operating environment (the air temperature immediately surrounding the relay unit) is maintained at or below the rated operating temperature, to ensure the internal components are maintained at temperatures which ensure long-term reliability. The operating environment must always be maintained below 55 °C.

To ensure reliable operation, airflow around the relay unit and the ventilation holes must not be restricted, and adequate ventilation should be provided in the enclosure to ensure that the temperature in the enclosure is maintained within the rated operating temperature range of the relay unit.

In order to maintain the operating environment within the rated operating temperature range, the operating calorific values and the heat load of all components contained within the distribution board must be considered when designing the distribution board.

The relay unit incorporates an internal temperature sensor and operating temperature of the relay unit can be monitored using the C-Bus Measurement Application. In addition, an over temperature alarm may be configured for monitoring abnormal conditions using the C-Bus Error Reporting Application.

Power Loss/Heat Load

The relay unit produces heat according to the following table. The amount of heat produced by the relay unit depends on various factors such as whether the C-Bus Power Supply is enabled, the load on the C-Bus Power supply, and the load current flowing in each channel.

The total heat output of the relay unit and all other devices contained within the distribution board must be considered when designing the distribution board, to ensure all devices within the distribution board are maintained within their rated operating temperature range.