WG20 Instructions 15
3.4
Power Supply Connection
3.5
Initial checks
The connection of the CL20 control unit to the mains must be
made by a qualified electrician.
To carry out tests, insert the plug for CL20 in a power outlet; if neces-
sary, use an extension cord.
The CL20 control unit must be permanently connected to the mains
power supply for the testing and commissioning operations.
This operation must be performed as follows by a qualified electrician:
1 Make sure that the plug of the CL20 control unit is not plugged into the
power socket
2 Disconnect the power cable from the CL20 control unit power supply
terminal
3 Slacken the collar close to the terminal and remove the cable
4 Insert the final power supply cable of the control unit through the collar
5 Connect the cable to the terminal of the control unit
6 Tighten the collar
Figure 52
As soon as the CL20 control unit is energized, you should check the
following:
1 Make sure that the "ECSBus" LED [A] flashes regularly, with about one
flash per second.
2 Make sure that the SAFE LED [B] on the photocells flashes (both on TX
and RX); the type of flashing is not important as it depends on other factors;
what is important is that the LED should not be steadily on or steadily off.
3 Make sure that the night light [C] on the KS1 key-operated selector
switch is on.
4 If the above conditions are not satisfied, you should immediately switch
off the power supply to the CL20 control unit and check the cable
connections more carefully. For more useful information see also
chapters 5.5 "Troubleshooting" and 5.6 "Diagnostics and Signals".
Figure 55
Figure 54
B
C
3.5.1
Recognition of Connected Devices
When you have completed the initial checks, the control unit must
recognize the devices connected to it on the "ECSBus" and "STOP"
terminals.
1 On the control unit, press the P2 button [C] and hold it down for at
least three seconds, then release the button.
2 Wait a few seconds for the control unit to finish recognizing the
devices.
3 When the learning procedure is completed, the STOP LED [A] must
remain on, while the P2 LED [B] must go off. If the P2 LED flashes it
means that an error has occurred: see paragraph 5.5 "Troubleshooting".
The connected devices recognition stage can be repeated again at any
time, even after the installation (for example, if an additional photocell is
installed); just repeat the procedure starting from step 1.
Figure 56
B
A
C
A
Figure 53
