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DOL 31 Speed Controller
Technical User Guide 23
7.9 Turn off functions
NOTE: These safety functions are only active when DOL 31 runs in Automatic slave mode.
DOL 31 can be configured with 2 different safety functions, which ensure a certain mode of operation in case of
e.g. malfunction in the controlling climate system.
1. Safety mode ensures that the DOL 31 output is set to 50 % if the analog input signal gets lower than 0.5 V.
2. Turn off limit: If safety mode is not selected, it is possible to select a turn off limit. When this function is cho-
sen, the DOL 31 output will be switched off if the analogue input signal is lower than this turn off limit. See
section
Set turn off limit [
}
24] .
This means that it is not possible to have both turn off mode and turn off limit activated at the same time.
See also
2
Turn off [
}
23]
7.9.1 Turn off
NOTE: The function is only active in Automatic Slave mode.
This function can be applied in installations in which security against e.g. ventilation failure is required even
though a fault is located on the overhead climate system. If the analog input signal ceases, the output is set to
50% and after 30 seconds the alarm is activated.
Turn off Yes
Not inverted
If the analog control signal reaches a level lower than
0.5 V.
Inverted
If the analog control signal exceeds 9.5 V.