When a pyranometer is not updating data you can follow on site the next steps
1. Visit the pyranometer and find the junction box near it.
On this junction box you should distinguish the pyranometer side and the controller side
The pyranometer side is where the pyranometer cable is connected.
In the controller side the power and data cables coming from controller are connected.
2. Measure on the junction box between red and blue. The voltage should be 24 VDC. If not you should check continuity of the cable (between controller and junction box). You should aso check inside Inaccess panel if the power supply unit is operational.
3. On the junction box from the pyranometer side the data cables are the white (data+), green (data-). You should find from the controller side the cables that are connected with white and green. Disconnect the cables (coming from the controller side). Measure the voltage between them).
It should be 5VDC.
If it is 0, check the continuity of the cable (between controller and junction box). If cable is fine you should contact Inaccess in order to find out from the panel's side what is going wrong.
Figure 1. Hukseflux manual