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The Zenec main switch uses an external control signal to operate EC fans. If the control signal fails, for example because of a technical fault, the EC fan can be manually switched to full speed. This function can be particularly useful in agriculture and livestock farming, as it helps maintain ventilation in the barn even if the control signal fails. In addition to the 100% function, the main switch also enables automatic control via an external control signal.
External main switch with bypass function. In an emergency, the frequency inverter can be bypassed using the main switch, enabling 100% operation of connected fans.
Zenec main switch for 1~/3~ EC fans from the ETAvent and ECblue series with 100% functionality. EC fans are controlled by an external control signal, e.g. 0–10 V. If the control signal fails due to a technical defect, the Zenec can be used to manually switch the connected EC fan to 100%.
The main switches have three switch positions. In position 1 or Auto, power is supplied to a connected frequency inverter. The controlled output of the frequency inverter
goes back to the switch, which uses the output to supply fans, for example. 100% or bypass means that the connected mains power supply is switched directly to fans or motors. This enables 100% operation in certain situations, such as emergency mode. An integrated auxiliary contact signals this switch position.
In position 0 or Off, the switch can be locked with a padlock. For combinations with frequency inverters without a sine filter, there are EMC inserts that can be inserted into the switches.