Endress+Hauser magphant, Operating Instructions Manual

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Magphant Diagnostics and troubleshooting
Hauser 29
11 Diagnostics and troubleshooting
11.1 Diagnostic behavior
Error messages are reported via the current output and relay output (depending on the
relay function that is configured). In addition, the red LED flashes to indicate the limit
value or error condition.
Type of error Relay output Current output Red LED
Amplifier error,
EEPROM error
(system error) De-energized 2 mA Flashing
Overflow (process
error) De-energized 2 mA Lit
11.2 Test mode
The miniature switch for the test mode (→  25, No. 1) allows the user to test the
electronics.
Testing the electronics
1. Set the test mode switch to the "test" position.

4 3 2 1
test off
test
A0040159
2. Turn the potentiometer for full scale value scaling counterclockwise to the end stop.
 The current output must now be exactly 20 mA.
3. If this is not the case, then replace the electronics module.
11.3 Replacing the electronics module
L
WARNING
Death or serious injury from electric shock when replacing the electronics module!
‣
Switch off the power supply before opening the electronics compartment cover.
1. Switch off the power supply.
2. Unscrew the cover from the housing.
3. Release the connecting cable from the terminal block.
4. Release the Phillips screw of the board support plate.
5. Release the securing screw of the ground wire (cable lug).
6. Carefully remove the board support plate from the housing.
7. Disconnect the plug of the coil current cable from the power supply board.
8. Disconnect the plug of the electrode signal cable from the amplifier board.