Fan-speed control

The TopTherm sensor device, which is compatible with the larger models in the range of electronically commutated (EC) TopTherm fan-and-filter units, automatically adjusts the fan speed in response to changes in temperature inside the enclosure.

Providing a simple and cost effective solution to the problem of fan-and-filter units running continuously, even when not required as the panel temperature is already at an acceptable level, the sensor will help to reduce energy consumption and consequently, running costs.

With a fixed set-point of 35°C, the device provides continuous control with fan speeds varying linearly between 10 % at 20 °C and 100 % at 35 °C. No additional power supply is required as the sensor takes a 10 V DC feed from the fan-and-filter unit itself.

Larger TopTherm fan-and-filter units with EC motors from Rittal accept a 0 to 10 V DC or PWM control signal and can be controlled using a programmable logic controller (PLC).

A tachometer signal output to monitor fan speed and operating conditions is included, to alert users immediately should any faults or failures occur.

For more information, please visit: www.rittal.co.uk