operation manual

41
Troubleshooting
In order to ensure that the equipment is electri-
cally safe, the feeding source must be a safety
extra-low voltage. It must also be a source of lim
-
ited power in accordance with EN60950 that
cannot supply more than 15 W. Normally, both
requirements are fulfilled by normal commercial
plug-in power supplies with appropriate power.
7 Troubleshooting
7.1 Command not confirmed
If at least one receiver does not confirm a command, the
device LED (D) lights up red at the end of the failed trans
-
mission process. The failed transmission may be caused
by radio interference (see „11 General information about
radio operation“ on page 47). The failed transmission
may also be caused by the following:
• Receiver cannot be reached.
• Receiver is unable to execute the command (load
failure, mechanical blockade, etc.).
• Receiver is defective.