Diagnostics and troubleshooting
Deltabar PMD75B HART
54
Hauser
11
Diagnostics and troubleshooting
11.1 General troubleshooting
11.1.1 General errors
Device does not respond
• Possible cause: Supply voltage does not match the specification on the nameplate
Remedial action: Apply the correct voltage
• Possible cause: The polarity of the supply voltage is wrong
Remedial action: Correct the polarity
• Possible cause: The cables do not contact the terminals properly
Remedial action: Check the electrical contact between cables and correct if necessary
Values not visible on the display
• Possible cause: Contrast setting is too weak or too strong
Remedial action: Increase the contrast setting (make screen darker) by pressing and
simultaneously
Remedial action: Decrease the contrast setting (make screen brighter) by pressing and
simultaneously
• Possible cause: The plug of the display cable is not connected correctly
Remedial action: Connect the plug correctly
• Possible cause: Display is defective
Remedial action: Replace the display
No backlighting on the display
Possible cause: The electric current and voltage are not correct.
Remedial action: Adapt the current and voltage to the specified values.
"Communication error" is indicated on the display when the device is started or the
display is connected
• Possible cause: Electromagnetic interference influence
Remedial action: Check grounding of the device
• Possible cause: Defective cable connection or display plug
Remedial action: Replace the display
Output current <3.6 mA
• Possible cause: Signal cable is not wired correctly
Remedial action: Check wiring
• Possible cause: Electronics module is defective
Remedial action: Replace electronics
HART communication not working
• Possible cause: Communication resistor missing or incorrectly installed
Remedial action: Install the communication resistor (250 Ω) correctly
• Possible cause: Commubox is connected incorrectly
Remedial action: Connect Commubox correctly
• Possible cause: Commubox is not set to "HART"
Remedial action: Set selector switch of Commubox to "HART"
Communication via CDI interface not working
Possible cause: Wrong setting of the COM port on the computer
Remedial action: Check the setting of the COM port on the computer and correct it if
necessary
Device measures incorrectly
Possible cause: Parametrization error
Remedial action: Check and correct the parameter configuration
