Translation of original operating instructions
80
AL-KO AT4F ATEX
The following must be noted when operating with frequency converter:
1.
The fan motor combination must be suitable for operation via frequency converters. Depending on the motor,
frequency converter or fan manufacturer, a sine filter must be taken into account.
2.
The frequency converter and the sine filter must be mounted outside the ATEX zone. These components must
not be mounted on the ATEX air handling unit.
3.
The motor must be protected against overload, e.g. PTC thermistor and approved PTC thermistor evaluation
unit. This PTC thermistor evaluation can also be carried out via the board MCB112 (especially for use with
explosion-protected motors) of the Danfoss frequency converter. A motor protection switch with bimetallic
release is not suitable.
4.
Under no circumstances may the permitted maximum speed of the fan and the motor be exceeded.
5.
Observe the operating instructions of the frequency converter manufacturer.
6.
Installation in accordance with the EMC Directive, ATEX Directive and the ATEX standards must be guaranteed.
7.
If the motor is operated via a FC or EC technology, the combination can be secured using a residual current
circuit breaker. For this purpose, an all-current sensitive residual current circuit must be selected.
ATTENTION
The connection diagrams are intended for illustration only. The actual connection diagram for
the specific installation is to be found in the installation documentation and applied.
5.10.1.3
Connection of EC fans
The circuit diagrams for EC fans are to be clarified according to the order.
The motors are generally equipped with internally connected temperature monitors.
If the motor is operated via a FC or EC technology, the combination can be secured using a residual current circuit
breaker. For this purpose, an all-current sensitive residual current circuit must be selected.
The following must be observed when operating EC fans:
1.
The EC fan used must be suitable for the required ATEX marking
2.
The EC motor has integrated protection functions that automatically switch off the motor in case of a fault. No
upstream motor protection device is required.
3.
Enter the release for the EC motor via the control signal or via the control input 0-10 V (system-related).
4.
Do not switch on and off the motor (e.g. in cyclic operation, operational switching) via the mains. In the event
of an accident (e.g. fire), the motor can be switched off on the mains side.
5.
To avoid electromagnetic interference, care must be taken to ensure a sufficient distance between the mains
and control lines.
6.
Observe the operating and assembly instructions from the EC fan manufacturer.
7.
Installation in accordance with the EMC Directive, DIN-VDE and ATEX Directive must be guaranteed.
Summary of Contents for AT4F Series
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