Endress+Hauser promag 31, Operating Manual

Page: 41 / 60

5.3 Replacing the transmitter electronics
Note!
The exchange of the transmitter electronics on the fiscal measuring unit Promag 31
can only be done by breaking the seal!
After the exchange the authorised standards institution has to be contacted (seal!).
Warning!
•
Danger from electric shock! Switch off the power supply before removing
the cover to the electronics area of the transmitter housing.
Caution!
•
When replacing the electronic boards, ensure that their markings are identical.
•
The local power supply voltage and frequency must be the same as the technical
specifications of the power supply boards.
Procedure:
1. Switch off the power supply (isolating the measuring system)
2. Loosen the Allen screws of the safety grip (3-mm Allen key).
3. Unscrew the cover of the electronics area of the transmitter housing.
4. Remove the local display (if present):
a) Loosen the mounting screws of the display module.
b) Unplug the ribbon cable of the display module form the amplifier board.
5. Remove the 2-pole plug of the power supply cable by pressing the catch of the
power supply board at the same time (Fig. 43: V4).
6. Remove the cable board of the screened signal cable from the amplifier board
(Fig. 44: V5).
7. Loosen the two Phillips screws of the board support plate.
Carefully remove the support plate approx. 4–5 cm out of the transmitter housing.
8. Remove the coil current cable plug from the power supply board (Fig. 43: V1).
9. Remove the ribbon cable plug (connection cable to the connection terminal area)
from the amplifier board (Fig. 44: V8, V9).
10. The entire transmitter electronics, together with the board support plate can now
be completely removed from the housing.
11. If necessary, remove the DAT module from the pin strip (Fig. 44: V 10) on the
amplifier board:
– Required when replacing the transmitter electronics
→
plug the old DAT in the
new amplifier board.
– Required when replacing a defective DAT
→
plug the new DAT on the old
amplifier board.
12. Replace the old transmitter electronics with new transmitter electronics.
13. Reassemble in reverse sequence.
b
a028
y
6
5
Fig. 42
Promag 31 5. Fault Location and Remedies
Hauser 41