
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
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
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.
Содержание DOL 31
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