Envipco FLEX Series - Troubleshooting Other Conditions; Display Not Functional

Chapter 6 Troubleshooting & Repairs
you may need to replace the AC motor.
• U . U o l t (U.volt) - Under voltage on the DC bus. The incoming power supply is
too low. This happens normally when power is removed from the VFD . If it
occurs while the machine should be operational, check the incoming power
supply voltage and all components in the power feed line to the drive.
If you see any other error messages on the VFD status display, contact Envipco.
6.4. Troubleshooting Other Conditions
This section explains troubleshooting steps for conditions that do not result in an error message.
6.4.1. Display Not Functional
If the display is not working, here are some steps to diagnose and solve the problem:
• First, be sure that the display is set to receive VGA signal. Press the input
selection button until it is set to VGA.
• Check that the data and power harnesses are secure.
• If the picture is off-center, use the Diagnostic Program (Misc /
Touchscreen) to calibrate the screen.
• If the touch screen is out of alignment, power it off and power it back on.
Then, re-calibrate the screen.
• If you need to replace the display, you will need to use a keyboard with a
pointing device to calibrate the screen.
6.5. Repairs
This section details common field repairs.
6.5.1. Swapping an RVM Controller
If you need to replace the RVM Controller Box, follow these steps to make sure the RVM retains its
configuration and accounting data.
1. Turn off the RVM Controller using the RVM Controller power switch.
2. Swing open the Sensor/Display Assembly
3. Remove all the cables that are connected to the RVM Controller Box.
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