Symbols Meaning; Control Sequence After A Power Failure - Siemens VALVEGYR LDU11.323A17 User Manual

Program and lockout indicator
Meaning of the sym-
bols:

Control sequence after
a power failure
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Building Technologies Division
In the event of lockout, the programming mechanism stops and thus the position indicator
fitted to the spindle of the mechanism. The symbol that stops above the reading mark
indicates the test phase during which lockout occurred and also gives the number of
programming steps completed from the start of this test phase (1 step = 2.5 seconds).
► Start position = operating position
In plants without vent valve:
Evacuation of test space by opening the valve on the burner side
«Test1» with atmospheric pressure (valve proving test on the mains side)
Test1
Filling the test space by opening the valve on the mains side
«Test2» with gas pressure (valve proving test on the burner side)
Test2
Idle steps until programming mechanism switches itself off
I I I
► Operating position = start position for the next valve proving test
In the event of lockout, all terminals receiving voltage from the valve proving system
LDU11... will be deenergized, except terminal 13, which is used for lockout indication.
After a reset, the programming mechanism automatically returns to its start position to
immediately program a new valve proving test.
Note!
Do not press the reset button for more than 10 seconds.
A power failure prior to evacuating the test space does not cause the control sequence to
change.
If a power failure occurs after the evacuation, the valve proving test will not be continued
when power is restored, but the programming mechanism first returns to its start position
and then performs the complete valve proving test.
CC1N7696en
20.04.2016