Troubleshooting; Weak Batteries; Duty Cycle - HomeMatic IP HmIP-SMI Montage- Und Bedienungsanleitung

Troubleshooting

9 Troubleshooting
9.1

Weak batteries

Provided that the voltage value permits it, the motion de-
tector will remain ready for operation also if the battery
voltage is low. Depending on the particular load, it may
be possible to send transmissions again repeatedly, once
the batteries have been allowed a brief recovery period.
If the battery voltage is too weak, this will be displayed
in the Homematic IP app and directly on the device via
the device LED (B) (see „9.3 Error codes and flashing se-
quences" on page 42). In this case, replace the empty
batteries by two new batteries (see „8 Replacing batteries"
on page 38).
9.2

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 device 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% conformity to this regulation.
During normal operation, the duty cycle is not usually
reached. However, repeated and radio-intensive pairing
processes mean that it may be reached in isolated in-
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