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5. Regulation
Various regulators can be fitted in order to regulate the speed. A distinction is
made between regulation of one fan or regulation of a number of fans at the
same time.
5.1 MX without speed control
When the MX is delivered, it operates at the maximum set speed when
connected to the power supply. This capacity is given on the sticker on the
top of the controls. Remove the LUS3 from the clamp strip of the controls
[see §8.2]
and the MX will operate at the minimum speed. In order to operate
the fan at a different speed, this speed must be set using the Control Unit VU
or a PC
[see §6.1]
.
5.2 Speed control of one MX fan cooling or heating
The following regulators are available for speed control of one MX fan.
SAG 0-M
Rotating switch for continuous adjustment of the speed. There is a potentiome-
ter under the rotation knob of the switch. By turning this potentio-meter, the
maximum speed nMAX is set. The release contact is opened in position ‘0’.
SAG 0-5
Rotating switch for adjustment of the speed in five positions. There is a poten-
tio-meter under the rotation knob of the switch. By turning this potentiometer,
the maximum speed nMAX is set. The release contact is opened in position ‘0’.
SAG 0-2
Rotating switch for adjustment of the speed in two positions. There are two
potentio-meters under the rotation knob of the switch. By turning these
potentio-meters, two independent speeds n1 and n2 can be set. The release
contact is opened in position ‘0’ For example
5.3 Speed control of a number of MX fans
The following regulators are available for speed control of a number of MX
fans.
VG 31
Power supply unit for the parallel control of maximum 31 MX fans. The unit is
fed with 230V/50Hz voltage. Depending on the speed regulation required, the
power supply unit is connected to the SAG 0 - M, SAG 0-5 or SAG 0-2.
DNG 31
Unit for day/night switching of maximum 31 MX fans. The switching times are
set with a timer. A central switch can be used to simultaneously switch all con-
nected fans on and off. The unit is fed with 230V/50Hz voltage. The DNG 31
can also be used for day/night switching of MX-ZMV.
5.4 Self-regulating mechanical ventilation system [ZMV]
The MX roof extract fan can be fitted with a so-called ZMV system. ZMV is the
abbreviation used for a self-regulating mechanical ventilation system. The MX-
ZMV is used to automatically regulate the pressure under the ventilator to a
constant value.
A pressure transmitter has been fitted under the cap of the MX-ZMV for this
purpose and is electrically connected as standard. The hose supplied must be
connected in the mounting curb under the fan or the silencer, in order to
measure the pressure.
It works as follows: the transmitter converts the measured pressure into a 0-
10V signal for regulation of the MX. The speed of the MX roof extract fan and
thereby the pressure is regulated on the basis of this 0-10V signal. The
required constant pressure is set using the Control Unit VU or via a PC/laptop.
See §6.1, 6.2 and 6.3 for details.
5.5 RSC servo contact
The servo contact can be used for the parallel switching of another system
component, a valve for example. The servo contact is supplied in a separate
housing which can be fitted under the cover of the MX, for example.
5.6 LTG temperature control
The LTG is a temperature regulator with which the MX speed can be continu-
ously adjusted, depending on the temperature. The temperature is measured
using the supplied temperature gauge. The temperature is set between 20°C
and 50°C using a rotation knob on the housing. Rotation of a potentio-meter in
the housing adjusts the bandwidth between 0.5°C and 10°C. The speed of the
MX varies between the minimum and maximum of the set bandwidth.
☞
The LTG can also be used in combination with the VG31. One LTG can
be used to control a number of fans. Note LTG uses a 18V DC power
source.
Cooling or heating
There is a choice between ‘cooling’ or ‘heating’.
• For cooling, the MX will be speeded up when the temperature increases.
A rotation knob on the LTG housing is used to set the temperature,
whereby the MX operates at the minimum speed. The MX is speeded
up as the temperature rises. The maximum speed is reached at the set
tempe bandwidth.
• For heating, the MX will be slowed when the temperature increases.
The rotation knob on the LTG housing is used to set the temperature,
whereby the MX operates at minimum speed. The MX is speeded up
as the temperature drops. The maximum speed is reached at the set
temperature bandwidth.
The cooling or heating function can be set using a number of jumpers within
the housing. The LTG also includes a jumper which can be used to select that
the fan is switched off when it reaches the set temperature.
For example
The jumpers in the housing are set to ‘cooling’. Temperature set at 25°C,
bandwidth at 4°C. MX fan capacity set at: minimum 40%, maximum 80%.
At 25°C, the fan works at 40%, at 25 + 4 = 29°C, the fan works at the
maximum capacity.
6.Communication
6.1 Reading and adjustment
Each MX is fitted with a connection for the Control Unit VU or a laptop/PC.
This connection can be found under the MX cover. Various units can be
adjusted and read via this connection, such as:
• type of fan and controls;
• required capacity and limitations of minimum and maximum capacity;
• required pressure for day and night [MX ZMV];
• current speed;
• current pressure [MX ZMV];
• address and group number [for application of MX in a network];
• malfunctions.
6.2 VU Control Unit
The VU Control Unit allows for direct communication with the MX.
Method of operation
The plug of the unit is inserted into the MX connection. Once the Control Unit
has been switched on, the current data of the MX is shown on the display of
the unit. These settings can be changed. Consider the following applications,
for example:
• adjustment on site or subsequent re-adjustment of the capacity of the MX;
• setting the required pressure [for MX-ZMV];
• setting an address [MX in network].
The unit is supplied in a case with a user’s manual. Also included with the unit
is a charging unit for charging in a car [12V] or via a wall socket [230V].
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