Helios 8320, Installation And Operating Instructions Manual, Page: 19 / 28

5. Speed control
– with speed potentiometer PU/A
For variable and direct control or nominal value preset of EC-fans with potentiometer input. Additionally equipped with an enabling switch
and LED-display for the operating status (dependant on feature of fan type). The potentiometer is attached directly to the potentiometer input
of the fan control system. This has therefore a potentiometer supply of e.g. 10 V DC and an input control signal of 0-10 V DC.
Basic circuit diagram:
Example: Variable speed control
– with universal control system EUR EC
For variable control or adjustment of single- and 3-phase EC-fans with an input control signal of 0 - 10 V DC. Connection examples of
the basic diagram are mentioned further below.
Basic circuit diagram:
Example 1: Temperature control with additional function Example 2: Differential pressure control and air velocity
and differential temperature control control
+
The use of other brands, especially other electronic devices, can lead to malfunctioning and even destruc-
tion of controller and/or fan. Controllers which have not been cleared by Helios are not liable for warranty and
guarantee claims!!
6. Motor protection
All DV EC roof fans are equipped with an integrated electronic temperature monitoring system for the EC motor and electronics. This protects
the motor against overloading and overheating.
+
If the thermal contact trips frequently, this is a sign that a possible fault has occurred. The system must not be
operated and it must be investigated by a qualified electrician.
Roof Fan DV EC... Eco
7
Fig.3
Fig.4 Fig.5
Control of several EC-fans with a potentiometer
In order to control several EC-fans via the setpoint input “0-10V”, the 10VDC -voltage source must provide the sum of all setpoint input
burden currents.
m
Parallel connection of +10VDC supply of several EC-fans is not permitted!
Depending on the type several EC-fans can be controlled with the 10VDC supply from a fan with a potentiometer (PU/A). For this see
the technical data of the control inputs and the wiring diagram SS-1035.
If the power of the EC-supply is not sufficient a customer-supplied sufficient external 10VDC can be used (galvanically separated from
the mains). Alternatively the Helios module “EUR EC“ can be used for various control duties.