Control Head Type 8681
ReplacementofComponentsandModules
20.2. Changing the electronics module
NOTE!
Electrostatic sensitive components/modules!
• The device contains electronic components which react sensitively to electrostatic discharge (ESD). Contact with electrostatically charged persons or objects may be hazardous to these components. In the worst case scenario, they will be destroyed immediately or will fail after start-up.
• Observe the requirements in accordance with DIN EN 61340-5-1 to minimize or avoid the possibility of damage caused by sudden electrostatic discharge!
• Also ensure that you do not touch electronic components when the supply voltage is on!
Removal procedure:
→
Open the housing following the instructions in Chapter “8. Opening and Closing the Housing”.
→ If necessary, mark the electrical connections to ensure correct assignment during reinstallation!
→ If necessary, note the position of the 4 DIP switches for the set color code and on the DeviceNet electronics module the DIP switches (8-switch block) for Baud rate and address. On the AS-i electronics module, note the AS interface address and the jumper positions (power supply to AS interface).
→ If required, read out and note special settings by the PC service program.
→ Loosen all electrical connections on the electronics module (plug-type connections, screw-type terminal connections).
→ Loosen the screw-type connection (Torx T10 screw) of the electronics module and store the screw in a safe place.
→ Carefully press the electronics module forwards so that the contact pins on the position measuring system are exposed.
Connection for the position measuring system's contact pins
Plug-in connector for valve V1
Fastening screw
(Torx 10)
4 DIP switches for color coding
Jumper for AS interface power supply
Plug-in connectors for valves V2 and V3
Electronics module, complete (lower part cast, ready for installation)
Fig. 38: Electronics module (here example of AS interface)
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