Basic Documentation

91/332
Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
10 Aggregates
10.1 Fan (basic types A and P)
The fan block controls and monitors the connected fans.
The following variants are supported:
 1-speed fan
 2-speed fan
 Variable-speed fan
Possible types of control for variable-speed fans:
 Assign fixed speeds for 1 or 2-speed operation without and with IAQ controller
override
 Control to constant duct pressure (static pressure measurement)
 Control to constant volumetric flow for 1 or 2-speed operation
(2 setpoints, dynamic pressure measurement)
 Control to constant volumetric flow for 1 or 2-speed operation
(2 setpoints, linear volumetric flow signal measurement)
xxxx
QQQ
2
1
12
V
12
dx d

p
a
Y
xx xx
QQQ
2
1
12
V
12
dx d

p
a
Y
Start Stop
Speed
Duct pressure (DP stat)
Vol flow (DP dyn)
Vol flow (linear 0..10 V)
Start Stop
Speed
Duct pressure (DP stat)
Vol flow (DP dyn)
Vol flow (linear 0..10 V)
Supply Extract
Inputs Outputs

p
Input pressure sensor
Precommand
(section 10.1.9)
Precommand checkback signal
(section 10.1.10)
12
Output speed 1, speed 2
V
Flow signal
(section 10.1.7)
Speed
Speed output 0..10 V
Overload signal
(section 10.1.8)
2
1
Start
Start condition 1, Start condition 2
(section 10.1.11)
12
Stop
Stop condition 1, Stop condition 2
(section 10.1.11)
10.1.1 Activate fan blocks
The fans can be activated only if basic types A or P are selected.
The fans are controlled via the operating mode. In addition, the following functions
can switch the fans either on or to a higher speed:
 Cascade controller
 Sustained mode
 Recirculated air operation
 Night cooling
 IAQ controller
The fans can also be switched on during operating modes
Precomfort and
Economy via functions "Sustained mode", "Recirculated air operation", and
"Night cooling".
Explanation of symbols
Note