Electrical connection
42/68-167-EN RHDE250 ... 4000 (Contrac) 27
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5 Electrical connection
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Each actuator requires a Contrac electronic unit which is loaded with the type specific-software.
Carefully consider the instructions for the electronic unit and compare the data labels of the
actuator and the electronic unit in order to ensure a proper hard- and software assignment.
The cable between the actuator and the electronic unit is connected to terminals.
Instructions regarding use in Ex applications
The electrical connection between the Contrac electronic unit and the Contrac actuator can be
established using the cable set (order code 695). The cable harness is not part of the Ex
prototype test certificate and must therefore be tested for safety-relevant functionality within
the complete installation by the installer or operator.
Consider the following issues:
• Consider the local regulation concerning the setup of electrical devices within hazardous
areas. This applies particularly to EN 60079-14 for the setup of the screen and the potential
compensation between the actuator, the electronic unit and the motor protection unit (see 1)
in chapter Cable shield, page 28 a
nd chapter Terminal connection diagrams, page29 ff.
• For the connection of the motor and the position transmitter only use ATEX certified EEx e
cable glands with IP 66 acc. to EN 50019.
• Use a cable socket or a solid wire, bended to a "U", to connect the motor cable.
• Ensure a proper strain relief for all cable connections.
• Protect all cables in the connections chambers against contact with metal components.
Ensure a gap of at least 6 mm between all conductive components.
• Remove the desiccant in motor and position sensor.
• Do not change the factory-set position of the motor terminal chamber.
• Seal all not used cable entries with ATEX certified IP 66 plugs.
• Use a certified cut-off unit for the thermal motor monitoring. Permitted units are, e.g.:
- ABB motor temperature monitoring unit SD 241 B
- 3 RN 1011-1 CK 00 , Ex II (2) GD , PTB 01 ATEX 3218, Siemens
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