Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
10.1.12 Step switch overrun
If a step switch with overrun is configured in the same plant, step switch overrun
takes priority over the stop condition of the supply air fan.
Thus, if the supply air fan is switched off via stop condition, step switch overrun is
observed. During operation, step switch overrun acts in the current fan speed and
on speed 1 during plant shutdown.
10.1.13 Sustained/recirculated air mode (basic type A)
You can specify for the extract air fan if it is to be switched on or off during
sustained or recirculated air mode. See sec. 20 "Recirculated air op (basic type A)".
Activating the mixed air da
mper is prerequisite for this function.
Main menu > Settings > Aggregates > Extract air fan >
Operating line Range Factory setting
Sustained/recirculated
air mode
Off, On Off
Fan order in which the extract air fans must be switched off in recirculated air
mode:
M
M
2
2
M
M
T
T
For this fan order, we recommend to disable the startup circuit for the mixed air
damper (section 10.5.10).
10.1.14 Startup delay
For some applications (extract air fan with own speed control, plant with
recirculated air mode, smoke extraction with extract air fan, etc.), the supply and
extract air fans must be switched on and off independently. For this reason, control
of the supply and extract air fans can be activated independently.
Always begin by configuring the supply air fan, as the controllers are switched on
only after the supply air fan is on.
If the supply air fan and the extract air fan are to be switched on at the same time,
only the supply air fan must be activated. The extract air fan can be connected in
parallel to the same relay.
A startup delay can be predefined for both fans. This allows e.g. for delayed
switching on of the supply air fan to prevent peak load on the network if both fans
were activated at the same time.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Supply air fan >
Main menu > Settings > Aggregates > Extract air fan >
Operating line Range Factory setting
Startup delay 00.00...59.59 m:s 00.00 m:s
Example
Note
Note
Setting values