Helios SilentBox SB EC Serie Notice De Montage Et D'utilisation page 28

Installation and Operating Instructions
EN
CHAPTER 7
FUNCTION FOR
INSTALLER
m
NOTE
m
NOTE
SS-979
Series
SB EC 125�� - SB EC 400��
SilentBox® SB EC ... EC Centrifugal Fan Boxes
7�1 Functional description
The scope of delivery includes an internal potentiometer in the terminal box with which any fan speed between min. and max.
speed can be set. For an external speed setting with a 0-10 V control signal, the internal potentiometer must be removed.
The SilentBox ® SB EC ... EC Centrifugal Fan Boxes are variable speed controllable by means of a 0-10 V control voltage.
Suitable potentiometers (Type PU/A 10; SS-980), three-step switches (Type SU/A) are available in the Helios accessory
range. Variable speed control is possible with a universal control system (Type EUR EC; SS-981). Alternatively,
the electronic differential pressure/temperature controller EDR / ETR can be used.
The use of other brands, especially other electronic devices, can lead to malfunctioning and even destruction
of the controller or fan� Controllers which have not been cleared by Helios are not liable for warranty and gua-
rantee claims�
Activation / deactivation:
Frequent switching on and off of EC fans can be carried out via the 0-10 V control input by switching off the control
signal to 0 V. This applies to operation with an external potentiometer or external 0-10 V signal from the building
management system. Switching off is alternatively also possible via a release input, depending on the type. This is
gentle on the electronics and ensures a long service life. If this is not easy to realise, e.g. when operating with an internal
potentiometer, it can also be done by switching off the mains supply. In general, a time interval of at least 120 seconds
must be observed when switching the mains off/on.
Controlling multiple EC fans with a potentiometer
In order to control multiple EC fans above the setpoint input "0-10V", the 10V DC voltage source must supply the sum
of all setpoint input load currents.
The parallel switching of +10V DC power supplies for multiple EC fans is not permitted!
m
Depending on the type, multiple EC fans can be controlled with the 10V DC power supply from one fan with a potenti-
ometer (PU/A). In this respect, consult the technical data for the control inputs and the wiring diagram SS-1035. If the
EC power supply current is not sufficient, a sufficient (customer-supplied) 10V DC may be used (galvanically isolated
from the mains power supply). Alternatively, the "EUR EC" module from Helios can be used for various control tasks.
For an external speed setting with a 0-10 V control signal, the internal potentiometer (scope of delivery) must be remo
ved.
7�2 Wiring diagram overview
The allocated standard wiring diagram SS-979 must be observed (see Fig. 7), as well as the wiring diagrams with speed
potentiometer PU /A 10 and universal control system EUR EC.
7�2�1 Principle diagrams
The delivery includes an internal potentiometer in the terminal box, which can be used to set any fan speed between
min. and max. speed. For an external speed setting with a 0-10 V control signal, the internal potentiometer must be
removed.
The diagrams show the potentiometer in principle. It is possible to connect an internal or external potentiometer.
Fig� 7
10k Potentiometer bzw.
0-10V Signal von z.B.
PU/A 10 Art.Nr. 1734/1735
oder EUR EC Art. Nr. 1347
10k Potentiometer or rather
0-10V Signal from e.g.
PU/A 10 Art.Nr. 1734/1735
or EUR EC Art. Nr. 1347
10k Potentiomètre resp.
0-10V Signal par example d`un
PU/A 10 Art.Nr. 1734/1735
ou EUR EC Art. Nr. 1347
85187 001 SS-979 30.06.22
M
EC
(5)
4
10
EC-Motor
EC motor
Moteur EC
+
3
Klemmkasten
Terminal box
Boîte à bornes
SS-979