Touchscreen Controller (Standard Remote/Controller 4) Not Powering Up (Public)

To determine why a touchscreen remote controller is blank or does not light up, we first need to talk about why it does light up. MacroAir's standard touchscreen controller is supplied voltage from the VFD. This will be around 10-24 VDC depending on the model of VFD. This power is sent from the VFD to the touchscreen through the brown and brown/white wires inside of the CAT5.

Below are some troubleshooting steps for a dead touchscreen:

1. Verify the wiring on the back of the touchscreen.

2. Verify that there is power going to the fan. The breaker and disconnect switches must be turned on and the VFD must be powered on to be able to provide power to the touchscreen. Ensure the disconnect switch is assembled properly.

3. If another fan is present, swap touchscreens between fans.

• If the problem follows the touchscreen, verify that the wheel on the back of the touchscreen is pointed to 0. The touchscreen will not light up if the arrow points to any other number. If the wheel is on 0, there is likely an issue with the touchscreen.
• If the problem stays with the fan, the touchscreen is likely fine and the issue lies elsewhere.

4. Verify 10VDC-24VDC on the brown and brown/white wires on the back of the touchscreen.

• If adequate voltage is present, verify that the wheel on the back of the touchscreen is pointed to 0. The touchscreen will not light up if the arrow points to any other number.
• If adequate voltage is not present, proceed to step 5.

5. Plug the touchscreen directly into the bottom of the VFD (Schneider/onboard circuit drives only. For Yaskawa, proceed to step 6).

• If the touchscreen lights up, there is an issue with the CAT5 wiring between the VFD and the touchscreen. For fans with control panels, this wiring consists of the control panel harness, the female/female coupler on the control panel, the CAT5 between the control panel and the touchscreen enclosure, and the female/female coupler on the touchscreen enclosure.
• If the touchscreen does not light up, verify 24VDC on the brown and brown/white wires on the back of the touchscreen again. If there is voltage, it is likely a bad touchscreen. If there is no voltage, there may be an issue with the VFD.

6. Plug the touchscreen into the outside of the control panel in the IN port (not applicable for onboard circuit drives).

• If the touchscreen lights up, there is an issue with either the CAT5 cable between the control panel and the touchscreen enclosure, or the female/female coupler on the touchscreen enclosure.
• If the touchscreen does not light up, there may be an issue with the control panel harness or female/female RJ45 coupler. Plug the touchscreen into the OUT port. If the touchscreen lights up, the control panel internal wiring harness is reversed and needs to be corrected. Switch the harness ends on the inside of the control panel IN port and the inside of the control panel OUT port and plug the touchscreen back into the IN port. If the touchscreen does not light up, the IN port RJ45 coupler is defective.

7. If the issue is determined to be with the CAT5 between the control panel and the touchscreen enclosure, verify that the CAT5 is correct.

• It must be CAT5e shielded stranded minimum, with no kinks or damage of any kind.
• The length of CAT5 between the control panel and the touchscreen must be less than 200'. Anything over 200' and you may start to see inconsistent operation due to voltage drop over longer lengths.

8. If the touchscreen has power, but the screen is blank white, try pushing the physical reset button on the touchscreen controller. The button location is shown in the below image.