Beckett RWF40 Manual - Manual (Page 12)

12/57 CC1B7865en 01.09.2005 HVAC Products
4. Electrical connections
− The choice of cable, installation and electrical connections of the controller must
conform to VDE 0100 «Regulations for the installation of power circuits with nominal
voltages below AC 1000 V», or the relevant local regulations
− The electrical connections must be made by qualified staff
− If contact with live parts is possible while working on the unit, the controller must be
disconnected from the power supply (all-polar disconnection)
− An internal current-limiting resistor cuts the supply voltage in the event of short-circuit.
The external fusing should not be rated above 1 A (slow). The output relays must be
fused for a maximum of 2 A to prevent contact welding in the event of a short-circuit in
the load circuit
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Section 11.2 «Outputs»
− No other loads may be connected to the controller’s main power supply terminals
− The electromagnetic compatibility and interference suppression levels conform to the
standards and regulations listed under «Technical data»
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Chapter 11 «Technical data»
− Input, output and supply cables should be routed separately, not parallel to one
another
− Arrange sensor and interface cables as twisted and shielded cables, and do not run
them close to power cables or components. Ground the shielding to the controller at
one end to the «PE» terminal
− Earth the «PE» terminal of the controller to protective earth. This cable must have a
cross-sectional area that is at least as large as that of the supply cables. Earthing
cables must be wired in a star configuration to a common earthing point connected to
the protective earth of the supply. Earthing cables must not be looped from one
controller to another
− The unit is not suitable for installation in areas with an explosion hazard
− Incorrect settings on the controller (setpoint, data of parameter and configuration
levels) can affect the proper functioning of the following process or lead to damage.
Safety devices independent of the controller, such as overpressure relief valves or
temperature limiters / monitors should therefore always be provided, and only be
capable of adjustment by qualified staff. Please observe the relevant safety
regulations. Since self-setting cannot be expected to handle all possible control loops,
the stability of the resulting actual value should be checked
− The analog inputs of the controller must not exceed a maximum voltage of AC 30 V or
DC 50 V against «PE»
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Section 4.3 «Galvanic separation»
4.1 Installation notes
Safety regulations
Fusing
Interference suppression
Incorrect use