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Valve outputs | Short-circuit and overload detection
Exception: If the previously executed testing operation was the 4th sequence
in succession without any error detection, then the actuator will assume that
this is a collective overload at multiple outputs. In this case, the actuator will
automatically deactivate one output of the affected group (output 3 or output
6), according to the priority. In so doing, the testing cycle counter will be de-
leted as for regular identification of an error, and testing again occurs with a 1
s switch-on time in the next cycle. If 4 cycles again occur after this, without
outputs being detected as overloaded or having shorted during the individual
test, then the actuator will again assume a collective overload and will auto-
matically permanently deactivate the next outputs of the group(s) (firstly output
2 and/or output 5, then, after four more cycles, output 1 and/or output 4).
–
5.
All the valve outputs not deactivated in the testing cycles then continue to work
normally.
If possible, connect actuators for environments with increased fail-safety re-
quirements to the outputs 1 and 4. During overload detection, these are
switched off last, as described.
Signal telegrams, if configured for a valve output in the ETS, are only gener-
ated for those valve outputs which were forcibly deactivated by priority in the
testing cycle, after the detection of an error or a collective overload.
The resetting of an overload or a short-circuit during a testing cycle is ignored.
To give less weight to detected overloads caused by rare, extreme interfer-
ence, such as strong electromagnetic coupling into the low-voltage network
(lightning strike close by), the cycle counter is reduced by 1 after a period of
28 days without the detection of a further overload or a new short-circuit. This
ensures that, after long periods of time, valve outputs are not simply switched
off after the 4th cycle without identification of a clear overload or a short-circuit.
A valve output switched off via the bus (output not energised) can also be en-
ergised during the overload or short-circuit detection phase for the period of
time defined in the testing cycle.
A short-circuit or an overload influences the command value status of the valve out-
puts of an output group. Even at the beginning of a short-circuit / overload identifica-
tion phase, the actuator will set the command value status, according to the valve dir-
ection of action, either to "OFF" / "0%" (for deenergised closed) or to "ON" /
"100%" (for deenergised opened). This valve status remains intact during the entire
length of the identification phase and for valve outputs identified as having short-cir-
cuited or being overloaded. Energisation phases during the testing cycles do not in-
fluence the command value status.
The command value status contained in the combined valve status is not influ-
enced by a short-circuit or an overload.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 100 of 257
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