Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
Linear step switch with 8 steps:
N.X1
Y
SIGNAL Y
x
A7.Q1
Q
A7.Q2
Q
Q
N.Q2
Q
N.Y1
Y
N.Q3
Q
N.Q1
N.Q6 N.Q7
Q
Q
Q
N.Q4
123
4
y1 y2
x
QQ Q
QY
y3
123
4
y1 y2
x
QQ Q
QY
y3
730
720
730
730
730
S1 S2 S3 S4
Y
S5 S6 S7 S8
S3 S2 S1 S4 S5
yp yp yp yp yp
a
d



Controller 1
(Ventilation)
With supply air limitation
Cascade
Constant (supply air)
Cascade/const (alternating)
Seq. limit. Casc/Const
Step
switch 1
Step
switch 2
Release
Linear
Binary
Linear
Binary
Release
Connect 1+2 Connect 2+3
SAT
3150s51en
The load increments are distributed linear to the number of configured relay
outputs; each load increment supplies 1/8 of the output in this example.
- Step 1 = Output step 1 of first step switch.
- Step 8 = Output step 4 of second step switch.
10.6.5 Locking time
Additionally, you can enter a common locking time for the relay outputs. This
ensures that a step that has just switched off remains off for the set period of time.
If a relay output is locked, all relays with less power remain switched on as needed
to prevent a total power drop-off.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Step switch 1...3 >
Operating line Range Factory setting
Locking time 00.00…10.00 mm:ss 00.00
10.6.6 Fan overrun time
For the step switches, an overrun time can be entered.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Step switch 1...3 >
Operating line Range Factory setting
Fan overrun time 00.00... 59.55 m:s 00.00 m:s
The overrun time ensures that the fans (see section 10.1 "Fan (basic types A and
P)") remain on for the set time following switch-off of the last switching step. Thus,
overrun time is active only if the step switch is configured with a relay.
With fans configured for recirculated air operation, overrun only acts on the supply
air fan. If the pumps should overrun also, set a switch-off delay for the pump.
Example 2
Load connection
Setting values
Setting values
Note