Endress+Hauser Proline Promag 51, Operating Instructions Manual

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Proline Promag 51 9 Trouble-shooting
Hauser 95
9.7 Removing and installing printed circuit boards
Field housing: removing and installing printed circuit boards (Fig. 46)
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Warning!
• Risk of electric shock. Exposed components carry dangerous voltages. Make sure that the power
supply is switched off before you remove the cover of the electronics compartment.
• Risk of damaging electronic components (ESD protection). Static electricity can damage electronic
components or impair their operability. Use a workplace with a grounded working surface
purpose-built for electrostatically sensitive devices!
• If you cannot guarantee that the dielectric strength of the device is maintained in the following
steps, then an appropriate inspection must be carried out in accordance with the manufacturer’s
specifications.
• When connecting Ex-certified devices, see the notes and diagrams in the Ex-specific supplement
to these Operating Instructions.
"
Caution!
With certified devices, the exchange of transmitter electronics is only possible by breaking the
leaded seal. After exchange by an Hauser service technician (provisional seal), the device
must be resealed by the appropriate standards authority.
1. Unscrew cover from the transmitter housing.
2. Remove the local display (1) as follows:
– Press in the latches (1.1) at the side and remove the display module.
– Disconnect the ribbon cable (1.2) of the display module from the amplifier board.
3. Remove the screws and remove the cover (2) from the electronics compartment.
4. Remove power supply board and I/O board (4, 6):
Insert a suitable tool into the holes (3) provided for the purpose and pull the board clear of its
holder.
5. Remove amplifier board (5):
6. Disconnect the plug of the electrode signal cable (5.1) including S-DAT (5.3) from the board.
7. Loosen the plug locking of the coil current cable (5.2) and gently disconnect the plug from the
board, i.e. without moving it to and fro.
8. Insert a thin pin into the holes (3) provided for the purpose and pull the board clear of its
holder.
9. Installation is the reverse of the removal procedure.
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Caution!
Use only original Hauser parts.