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DESCRIPTION OF FUNCTIONS
• The VariMax50M is a control device with embedded Modbus communication.
Technical data for Modbus can be found on page 13-26.
The control function can also be used with a normal 0-10 V input signal.
Refer to page 6-11.
• The VariMax50M is part of a range of control units adapted for optimum control of
rotating heat exchangers, with the necessary additional functions.
The range consists of three sizes: VariMax25M, VariMax50M and VariMax100M.
All control units run a 3-phase stepping motor.
All control units have an input signal of 0-10 V.
• The VariMax50M is designed for rotors up to 2500 mm with a rotor speed of max.
12 rpm. If the rotor requires a faster rotor speed, the rotor diameter should be reduced.
• The VariMax50M has built-in input signal shift, which means that the rotor's efficiency is
proportional to the input signal.
• The VariMax50M has a preset threshold value of 0,1 V (hysteresis 0,13–0,07 V).
If the input signal falls below this value, the rotor will stop.
• The VariMax50M has a rotation monitor (magnet mounted on the rotor with associated
magnet transmitter) and a built-in cleaning function.
The functions can be disconnected via DIP switches.
• The VariMax50M starts automatically after voltage drop-out, and resets
all alarms on restart.
• The VariMax-motor50 is a stepper motor with substantial moment over the entire speed
range.
• When the motor is stationary, a holding moment is activated, which means that the rotor
always remains still.
The holding moment disappears if the voltage to the control unit is lost.
• The motor is mounted with a 3 m cable as standard.
• If total cable length exceeds 3 m, external EMC filters should be used.
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