Operation; Functional Description; Wiring Diagram Overview - Helios SilentBox SB EC-Serie Montage- Und Betriebsvorschrift

Installation and Operating Instructions
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ATTENTION
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WARNING
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CHAPTER 7
FUNCTION FOR
INSTALLER
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NOTE
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NOTE
SilentBox® SB EC . . . EC Centrifugal Fan Boxes
– A multipole mains section switch/isolator, with a minimum contact opening of 3 mm (VDE 0700 T1 7.12.2/
EN 60335-1) is mandatory!
– Network configuration, voltage and frequency must be consistent with the rating plate information..
– Check the waterproofing of the connection cable and tight clamping of the strands.
– Metal cable screws must not be used when connecting to plastic terminal boxes.
– Insert the supply line so that no water can get in along the cable in case of water exposure.
– Check designated use of fan
– Compare mains voltage to rating plate data
– Check fan for solid mounting and professional electrical installation
– Check all parts for tightness, particularly screws, protection guards. Do not loosen screws in the process!
– Check free movement of the impeller. Wear protective gloves when checking unhindered running of impeller!
– When the impeller is turned by hand, there will be slight resistance due to the permanent magnets. This is for
technical reasons and it is not a malfunction
– Compare power consumption to rating plate data
– Check protective conductor connection
If a residual current device is installed in the supply line of the EC fan, the residual current device must have the following
technical features:
Type A or B with a rated differential current of 300 mA and delayed triggering (super resistant, characteristic K).
The EC fan has a leakage current of <= 3.5 mA, calculated according to DIN EN 50178 image 4.
ATTENTION:
The EC fan is intended exclusively for fixed installation, connection via plug is not permitted.
6 .5

Operation

In order to ensure the proper functioning of the fan, the following must be checked regularly:
– Formation of dust or dirt deposits in the casing or on the motor and impeller
– Freewheeling of impeller. Wear protective gloves when checking freewheeling of impeller!
– Occurrence of excessive vibration and noise
If excessive vibration or noise occurs, maintenance must be carried out according to the instructions in chapter 8.
7 .0

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 cont-
rol 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.
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The parallel switching of +10V DC power supplies for multiple EC fans is not permitted!
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 .1

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.
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