5.4.3 Line protection fuse
The mains connection must be fused depending on the used cable, the type of routing, the operating
conditions and according to the standards applicable on site. The specification for the maximum
admissible line fuse of the device must be observed (see technical data).
Possible components for the line protection (recommendation):
•
Safety fuses of operating class “gG” (whole range fuse cartridges for general applications according
to EN 60269-1).
•
Line protection switch with characteristic “C” (according to EN 60898-1).
•
Motor protection switch with overload and short-circuit trigger (according to EN 60947-4-1). Setting
overcurrent trigger to maximum permissible current of the line.
5.4.4 Leakage current, securely attached, protective earth conductor
Danger due to electric current
The maximum leakage current depends on the type of device and the connected mains voltage (
Technical Data). With regard to fixed connection and the type of PE conductor connection, the
specification for the leakage current must be observed under consideration of the locally valid
standards (for Europe
EN 50178 Section 5.2.11 or 5.3.2.1 etc.).
Minimum cross-section for PE conductor for fixed connection = 1.5 mm
2
!
5.5 Residual-current-operated protective device
Danger due to electric current
For an installation of r.c.d. protection, it shall be observed that this must be of “universal-current
sensitivity” (Type B). In accordance with EN 50 178, Section. 5.2. other types of current-operated
protective devices may not be used. To ensure as high a degree of reliability as possible , we
recommend a tripping current of 300 mA.
5.6 Inverter output
5.6.1 Motor connection
The motor leads are connected to the terminals: PE, U, V, W. Several fans can be connected to the
controller-the maximum total current of all motors must not exceed the current rating for the controller.
Information
•
It is recommended that a separate motor protection unit be foreseen for each fan.
•
For motors with thermistors “TP” (PTC thermistor) e.g. type U-EK230E
•
For motors with thermostats “TB” (thermal contacts) e. g. type STDT16 or AWE-SK (
Enclosure:
Connection suggestion for several motors with motor protection unit type STDT.)
5.6.2 Disconnection between controller and motor (repair switch)
Ideally, a repair switch should be installed before the controller (supply line disconnect).
In the case of complete disconnection (entire load) after the controller, the enable (controller OFF /
ON) must be disconnected simultaneously. I.e., an additional control contact is needed. Switching on
the motor while simultaneously issuing the enable (ON) achieves secure energizing with low
saturation of the controller.
Attention!
When switching on the motor plus existing release: under certain circumstances, this can occur under
full modulation of the controller.
Operating Instructions Fcontrol Basic – model series FSDM2.5..50AM Electrical installation
L-BAL-E174-GB 1704 Index 005 Part.-No.
16/49
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