Personnel Qualification; Air-Flow Direction And Direction Of Rotation; Speed Control With Speed Potentiometer (Pu/A); On/Off Switching - Helios RDEC Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
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WARNING
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WARNING
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ATTENTION
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NOTE
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NOTE
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NOTE
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WARNING
RD/VD.. EC – Roof Fans
1.6

Personnel qualification

– All electrical work as well as the start-up must only be carried out by qualified electricians.
– Installation, servicing and maintenance may be carried out by specialists (e.g.: industrial mechanics, mechatronics
engineers, metal workers or persons with comparable training) with the exception of electrical work.
1.7

Air-flow direction and direction of rotation

m WARNING
Parts ejected from the fan may damage your eyes!
Wear protective glass when checking the direction of rotation!
m WARNING
The rotating impeller can sever or trap your fingers/arms!
Operation only with mounted safety fittings!
Do not insert objects into the rotating impeller! Risk of damage!
The roof fans have a fixed direction of rotation and air-flow direction (they are not reversible), which is indicated by an
arrow on the device reverse operation not possible).
The direction of rotation may only be checked when the fan is switched off and coasting!
1.8

Speed control with speed potentiometer (PU/A)

For the stepless and direct control or setpoint specification of EC fans with a potentiometer input. Additionally equipped
with an enabling switch and LED display for the operating status (depending on the equipment of the fan type). The
potentiometer is connected directly to the potentiometer input of the fan control unit. This has a potentiometer supply
of e.g. 10 V DC and a setpoint input of 0 –10 V DC for this purpose.
m On/Off switching:
Frequent on/off switching of EC-fans can be carried out via the 0-10 V control input respectively dependent
on Type via the enable input. This protects the electronics and ensures a long life time. A control via the mains
supply (off / on) is not recommended. Generally an interval of at least 120 seconds must be kept between
switching the mains off/on.
m In case of strong vibrations and / or noises servicing by a qualified technician must be carried out
according to chapter 1.6.
The maximum length of the control line must not exceed 30 m. In case of a length over 20 m, shielded cables
must be used.
Basic circuit diagram with universal control system (EUR EC)
Fig.1
Stepless
speed control
with potentiometer
Enable*
Operating status /
Fault indicator*
For the stepless control or regulation of one and three phase EC fans with a setpoint input of 0 –10 V DC.
Connection examples can be found in the basic circuit diagrams below.
Basic circuit diagrams:
Example 1: Temperature control with additional function
and differential temperature control
Fig.2
or
The use of third party products, especially other electronic devices, can lead to functional problems, the
destruction of the controller and/or fan. If control units are used, which have not been approved by Helios, all
warranty and liability claims shall lapse!
*Depends on fan type
EC
Fan
Example 2: Differential pressure control and
Fig.3
EC
or
Fan
3
air speed control
EN
EC
Fan