24 WG20 Instructions
5.6
Diagnostics and Signals
A few devices issue special signals that allow you to recognize the operating status or possible malfunctions.
Table 13
"SAFE" LED
Status
Action
Off
The photocell is not powered or is
faulty
Make sure that there is voltage (approx. 8-12 Vdc) on the photocell's
terminals; if the voltage is correct, the photocell is probably faulty.
3 quick flashes and a
second's pause
Device not recognized by the control
unit
Repeat the recognition procedure on the control unit. Make sure that all the
photocell pairs on ECSBus have different addresses (see Table 11 on page
21)
1 very slow flash
The RX receives a perfect signal
Normal operation
1 slow flash
The RX receives a fair signal
Normal operation
1 quick flash
The RX receives a poor signal
Normal operation but you should check the TX-RX alignment and make sure
the glasses are clean
1 very quick flash
The RX receives a very poor signal
It is at the limit of normal operation, you should check the TX-RX alignment
and make sure the glasses are clean
Always on
The RX does not receive any signal
Check to see if there is an obstacle between TX and RX. Make sure that the
LED on TX flashes once slowly. Check the TX-RX alignment
Figure 69
A
5.6.1
Photocells
The photocells are equipped with a "SAFE" LED [A] that allows you to check the operating status at any time.
During the manoeuvre the flashing light flashes once every second. When something is wrong the flashes are more frequent (half a second); the light
flashes twice with a second's pause between flashes.
Table 14
Quick flashes
Status
Action
1 flash
1 second's pause
1 flash
ECSBus error
At the staring of the manoeuvre, the devices present do not
correspond to those recognized; check and if necessary try
repeating the recognition process. (see 5.3.3 "Recognition of
Other Devices").
One or more devices may be faulty; check and, if necessary,
replace them.
2 flash
1 second's pause
2 flashes
Triggering of a photocell
At the staring of the manoeuvre, one or more photocells do not
enable it; check to see if there are any obstacles. If there is an
obstacle impeding the movement no action is required.
3 flash
1 second's pause
3 flashes
Cutting in of the "motor force" limiting device
During the movement, the leaf experienced excessive friction;
identify the cause
4 flash
1 second's pause
4 flashes
Cutting in of the STOP input
During the movement the STOP input was activated; identify
the cause
5.6.2
Flashing light
