Duty Cycle; Recovery System - HomeMatic CCU3 Montage- Und Bedienungsanleitung

8.3

Duty cycle

The duty cycle is a legally regulated limit of the transmis-
sion time of devices in the 868 MHz range. The aim of
this regulation is to safeguard the operation of all devices
working in the 868 MHz range. In the 868 MHz frequency
range we use, the maximum transmission time of any de-
vice is 1% of an hour (i.e. 36 seconds in an hour). Devices
must cease transmission when they reach the 1% limit
until this time restriction comes to an end. Homematic IP
devices are designed and produced with 100% conform-
ity to this regulation.
During normal operation, the duty cycle is not usually
reached. However, repeated and radio-intensive teach-
in processes mean that it may be reached in isolated in-
stances during start-up or initial installation of a system.
If the duty cycle is exceeded, this is indicated by one long
flashing of the device LED, and may manifest itself in the
device temporarily working incorrectly. The device starts
working correctly again after a short period (max. 1 hour).
8.4

Recovery system

The recovery system is only required if the software of the
Central Control Unit has been damaged. This can hap-
pen, for example, if the power supply is interrupted dur-
ing a software update.
Via the LED (A) it is indicated, that the operating system
of the CCU3 cannot be started any more (see „8.1 Error
codes and flashing sequences" on page 46). In this
Troubleshooting
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