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Valve outputs | Short-circuit and overload detection
If there is a collective overload, various weak overloads, possibly at multiple outputs,
have collected into a stronger overall overload. If there is a collective overload, it may
occur that, even after four testing cycles, no output can be clearly identified as over-
loaded. In this case, after the fourth cycle, the actuator will deactivate individual valve
outputs of an output group, until no overload exists.
Here is the testing cycle for the identification of overloaded or short-circuited valve
outputs in detail...
–
1.
An overload or short-circuit was detected in a group. The actuator deactivates
all the valve outputs of the affected group. The switch-off idle phase (6
minutes) is started.
–
2.
The first valve output of the affected group (output 1 or output 4) switches on
for approx. 1 second, if this output was not previously deactivated by a previ-
ous testing cycle. If the output was previously deactivated, then the actuator
switches the next output on (output 2 or output 5, etc.).
–
2. a
If, during the switch-on time, no overload or no short-circuit is detected be-
cause the overload / the short-circuit is pending at another output or is too
slight (weak overload), then the output will be switched off again. Continue
with Step 3.
–
2. b
If, at the tested valve output, an overload or a short-circuit is detected, then a
forced switch-off takes place immediately at this output. The output is deactiv-
ated. Then a switch-off idle phase of 6 minutes is started, during which the er-
ror detection circuit resets thermally. During this time, the affected output
group remains completely switched off.
–
3.
The output test started under Step 2 is continued with the next output, which
has not been deactivated, in the appropriate group in the same fashion, with a
time gap of approx. 4 seconds from output test to output test, until the last
valve output of the group or both groups has been processed.
–
4.
The testing cycle is then finally exited when all the valve outputs or both
groups have been processed.
–
4. a
The valve outputs detected as overloaded or having shorted in the testing
cycle of the group(s) now remain deactivated and cannot be switched on again
until the reset. The testing cycle counter is deleted. All the unaffected valve
outputs are again activated normally.
–
4. b
If, during the testing cycle, no output was detected as being overloaded or
having shorted (probable weaker overload), then the testing cycle counter for
this/these group(s) will count upwards, so that, in the next cycle, all the af-
fected valve outputs are tested with an extended switch-on time, in order to
detect weaker overloads.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 99 of 257
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