A compact fan speed control sensor has been introduced for Rittal’s TopTherm fan-and-filter units. Compatible with the larger models in the range of electronically commutated (EC) TopTherm fan-and-filter units, this automatically adjusts the fan speed in response to changes in temperature inside the enclosure.
This is a 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 therefore running costs.
With a fixed setpoint 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 10V DC feed from the fan-and-filter unit itself.
Larger TopTherm fan-andfilter units with EC motors from Rittal accept a 0 to 10V 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.
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