•MiniMax (enclosed IP54) is a modern, vector modulated frequency converter, with the
additional functions necessary for optimum control of rotating heat exchangers.
e control unit can handle all input signals currently used in the market.
•Heat exchanger rpm and thus thermal eciency are governed by the control unit so that
wheel speed is proportional to the input signal from the control centre.
•If the input signal is less than the set threshold value the rotor is stopped.
•When the rotor has been at a standstill for 1/2 hour, cleaning begins and the rotor turns
for 10 seconds at minimum rpm.
•e rotation monitor (a magnet tted to the rotor with an associated magnetic sensor)
stops the converter and generates an alarm in the case of a broken belt or similar.
•In the event of over- or under voltage on the mains, short circuit or earth fault and
tripped thermal contact in the motor, the control unit trips and generates an alarm.
•e control unit restarts automatically following a power failure.
•e motor should not be disconnected from the control unit while under load.
•e control unit can be equipped with extra cards. e following cards are available:
- Dierential temperature regulator with electrical heating output
- 2-rotor module
DESCRIPTION OF FUNCTIONS
45
