Table of Contents
Advertisement
DESCRIPTION OF FUNCTIONS
• MiniMax (enclosed IP54) is a modern, vector modulated frequency converter, with the
additional functions necessary for optimum control of rotary heat exchangers.
The control unit can handle all input signals currently used in the market.
• Heat exchanger rpm and thus thermal efficiency are governed by the control unit so that
rotor 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.
• MiniMax has an adjustable threshold of 20% of the input signal´s maximum value.
• MiniMax has adjustable boost function.
• The rotation monitor (a magnet fitted 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.
• MiniMax starts automatically after voltage drop-out,
and resets all alarms on restart.
• The motor should not be disconnected from the control unit while under load.
• The control unit can be equipped with extra cards. The following cards are available:
- Differential temperature regulator with electrical heating output
- 2-rotor module
5
Advertisement
Table of Contents
