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LPT-M - Operation Manual
Rev. B | 2022.03
10 TROUBLE SHOOTING
LPT-M won’t power up. (blank display)
Is the power properly connected? Check the connections. Refer to Section 5.7
Wiring Connections. Check the display contrast. Refer to Section 6.5 Set LCD
Display Contrast Level.
Display shows a channel status FAULT message.
The LPT-M is in fault mode. If re-calibrating the sensor fails, replace the sensor.
Display shows “Calibration Failure”.
The span calibration failed. Try to recalibrate the sensor again. If re-calibrating
the sensor fails, replace the sensor.
LPT-M powered up (display appears normal) but the control panel displays
“Fault”.
Modbus® output signal has not been connected properly. Check the
connections and refer to the Wiring Examples in Section 5.7 Wiring
Connections.
Device cannot be seen by the Controller and/or the BAS / DDC on the
Modbus® network.
• Check the Baud rate. All devices in the network must have the
same Baud rate.
• Check that local area network wiring is correct, especially the A
and B lines to make sure they are not swapped between devices
on the network.
• Check the Modbus® ID. Each device must have a unique ID
assigned to it.
Frequent, unexpected alarm conditions.
Check to see if EMI and RF
interference is causing the equipment to react this way. Refer to Section 5.5.2
EMI and RF Interference Considerations for more information.
