22
| EN
EIOM v2018.04
Figure 5.2.3.6 – rotation sensor mounting:
(1) – Rotor heat exchanger; (2) – Rotation sensor; (3) – Magnet;
The control unit is protected by monitoring for both over-voltage and undervoltage. If the supply voltage goes over or under the allowed limits,
an alarm is triggered and the motor stops. The motor starts again automatically when the supply voltage returns to its normal value. The alarm is
automatically reset.
The control unit has built-in motor protection that protects against overloading, and external motor protection is not required. Power supply to the
motor is cut in the event of overload. In order to restart the drive system, the supply voltage to the control unit must be temporarily disconnected
for at least 5 seconds.
Built-in short circuit protection protects against short circuits between the phases of the motor and between the phases and earth
Setting DIP switches for control signal:
Control signal
DIP switches
DIP switches
DIP switches
1
2
3
0-10V
ON
OFF
OFF
2-10V
ON
OFF
ON
0-20V
OFF
OFF
OFF
4-40mA
ON
ON
ON
0-20mA
ON
ON
OFF
Rotation monitor
DIP switches
Speed controller
DIP switches
Direction of rotation
DIP switches
4
5
6
With external rotation sensor ON
V-belt
ON
Clockwise
OFF
RotoSens
OFF
Other belts
OFF
Counter Clockwise
ON
Direction of rotation
DIP switches
DIP switches
7
8
100 %
OFF
OFF
80 %
OFF
ON
60 %
ON
ON
Varimax25
The VariMax25 is part of a range of control units adapted for optimum control of rotating heat exchangers, with the necessary additional functions.
The VariMax25 control unit have an input signal of 0-10 V.
Figure 5.2.3.7 – stepmotor controller VariMax25 electrical connection scheme:
(1) – Power supply 1~230VAC, 50Hz; (2) – Alarm relay; (3) – Man. speed; (4) – Input signal (0-10V); (5) – Rotation monitor; (6) – Reset; (7) –
Thermal contact; (8) – Stepper motor 3-phase;
