Diagnosis And Troubleshooting; General Troubleshooting - Endress+Hauser Cerabar PMP71B Operating Instructions Manual

Diagnosis and troubleshooting

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11 Diagnosis and troubleshooting
11.1

General troubleshooting

11.1.1 General errors
Device not responding
• 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
• Possible cause: Load resistance too high
Remedial action: Increase the supply voltage to reach the minimum terminal voltage
No values visible on the display
• Possible cause: Graphic display is set too bright or too dark
Remedial action: Increase or decrease the contrast with the Contrast display parameter
Navigation path: System → Display → Contrast display
• 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 background lighting on the graphic display
Possible cause: The electric current and voltage are not correct.
Remedial action: Increase the supply voltage and restart the device.
"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
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
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
11.1.2 Error - SmartBlue operation
Operation via SmartBlue is only possible on devices that have a display with Bluetooth
(optionally available).
Cerabar PMP71B HART
Endress+Hauser