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Valve outputs | Short-circuit and overload detection
A valve output affected by a short-circuit / overload (valve completely closed
on deenergised closed or completely opened on deenergised opened) does
not influence the evaluation of the calculation of the "Largest command value"
or the heat requirement and pump control.
Examples of overload / short-circuit detection...
Example 1
Error case = Short-circuit at valve output 4.
A short-circuit generates a short-circuit/overload signal in output group A4...A6. This
produces the following sequence...
"0"
Output not energised
"1"
Output energised
"N"
Normal operation of the valve output
"T"
Short-circuit / overload identified (signal telegram is cancelled if configured)
On next error detection in group 4-6: Test switch-on time: 10 s
Example 2
Error case = Weak overload at valve output 2.
The overload is so weak that a switch-on time of 1 second does not lead to error de-
tection. In the case of a weak overload, it should be expected that the overload/short-
circuit signal only affects the directly affected output group (here: Outputs 1 to 3).
This produces the following sequence...
On next error detection in group 1...3: Test switch-on time: 10 s
It should be expected that, in normal operation, an overload will again be detected in
the previously affected output group...
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Image 17: Short-circuit at valve output 4
Image 18: Weak overload at valve output 2 / first testing cycle
Page 101 of 257
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