Gira KNX 2139 00 Product Documentation page 103

Valve outputs | Short-circuit and overload detection
Image 23: Total overload in output group 1...3 / fourth testing cycle
On next error detection in group 1-3: Test switch-on time: 1 s
Short-circuit / overload signal telegrams
Signal telegrams, are only transmitted for the outputs which were deactivated by pri-
ority in the testing cycle, after the detection of an error or a collective overload. The
precondition is that the signal telegram on the parameter page "VOx - General -
Status" is enabled by the "Short-circuit / overload signal" parameter with the setting
"yes". The telegram polarity of the status telegram can be configured.
An active short-circuit / overload signal remains intact after a device reset by bus
voltage return. In this case as well, the short-circuit / overload signal must first be re-
set (see "Resetting a short-circuit / overload" below). If, before the bus voltage failure,
no short-circuit and no overload was identified, then the actuator will first transmit a
signal telegram "No short-circuit / no overload" after bus voltage return. Should, after
bus/mains voltage return, a short-circuit or an overload occur, then the actuator will
start a new identification phase.
After an ETS programming operation, short-circuit / overload signals are always de-
activated. Here, in the case of shorted or overloaded valve outputs, the actuator will
first perform an identification phase again, in order to detect faulty valve outputs.
The object always transmits the current status after bus voltage return and an
ETS programming operation after a delay, providing that a delay after bus
voltage return has been configured on the parameter page "General - Valve
outputs".
The states "Short-circuit" and "Overload" are also fed back in the combined
valve status .
Resetting a short-circuit / overload
Valve outputs, identified as having shorted or being overloaded, are detected by the
actuator. In this case, affected valve outputs can no longer be activated by any func-
tions of the actuator. The cause of the error must be eliminated and the "Short-cir-
cuit / overload" state also be reset, so that the outputs can be activated again.
There are two alternative options for the recommissioning of one or more deactivated
valve outputs...
– Global reset of all overload / short-circuit states:
All the overload / short-circuit states of the actuator can be reset jointly. For
this, the 1-bit communication object "Reset short-circuit / overload" is avail-
able, which can be enabled on the parameter page "Valve / pump", using the
"Global reset of all 'Short-circuit / overload' signals?" parameter in the "Yes"
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100 Page 103 of 257