Electrical Connections; Installation Notes - Siemens RWF40 Series User Manual

4.1 Installation notes

Safety regulations
Fusing
Interference suppression
Incorrect use
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− The choice of cable, the installation and the electrical connections of the controller
must conform to the regulations of VDE 0100 «Regulations for the installation of
power circuits with nominal voltages below AC 1000 V», or appropriate local
regulations
− The electrical connections may only be carried out by qualified personnel
− If contact with live parts is possible while working on the unit, the controller must be
disconnected from the power supply at both poles
− An internal current-limiting resistor interrupts the supply voltage in the event of a 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
Section 11.2 «Outputs»
− No other loads may be connected to the supply terminals of the controller
− The electromagnetic compatibility and interference suppression levels conform to
standards and regulations listed under «Technical data»
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 screened cables, and do not run
them close to power cables or components. Ground the screening to the controller at
one end to the «TE» terminal
− Earth the «TE» terminal of the controller to the 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 may 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 that are 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 personnel. Please observe the appropriate
safety regulations. Since self-setting cannot be expected to handle all possible control
loops, the stability of the actual value that is produced should be checked
− The analog inputs of the controller may not exceed a maximum voltage of AC 30 V or
DC 50 V against «TE»
Section 4.3 «Galvanic separation»
CC1B7865E

4. Electrical connections

February 10, 2000 Landis & Staefa Division