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Siemens
RDF300… / RDF340... / RDF400… / RDF600… Basic Documentation
CE1P3076.en
Smart Infrastructure
2020-02-21
4.7
Control outputs
Different control output signals are available depending on the controller type.
Control output
Type reference
on/off
3-position
DC 0…10 V
RDF300…
Y11, Y21 (2)
Y11/Y21 (1)
RDF400…
Y11, Y21 (2)
Y11/Y21 (1)
RDF340…
Y10, Y20 (2)
RDF600
Y11, Y21 (2)
Y11/Y21 (1)
RDF600T
Y11, Y21 (2)
Y11/Y21 (1)
( ) Number of outputs
The valve or compressor receives the
OPEN/ON
command via control output Y11
or Y21:
1. When the acquired room temperature is below the setpoint (heating mode) or
above the setpoint (cooling mode).
2. When control outputs Y11/Y21 were not energized for more than the “Minimum
output off time” (factory setting 1 minute, adjustable via parameter P48).
The valve or compressor receives the
CLOSE/OFF
command via control output
Y11 or Y21:
1. When the acquired room temperature is above the setpoint (heating mode) or
below the setpoint (cooling mode).
2. When control outputs Y11/Y21 were energized for more than the “Minimum
output on time”; (factory setting 1 minute, adjustable via parameter P49).
Output Y11 provides the
OPEN
command, and Y21 the
CLOSE
command to the 3-
position actuator. The factory setting for the runtime is 150 seconds (adjustable via
parameter P44 from 50…240 seconds).
1. When the controller gets powered up, a closing command for the actuator
r 150% is provided to ensure that the actuator fully closes and
synchronizes to the control algorithm.
(
RDF3..., 4...:
SW < 3.1: + 20%).
2. When the controller calculates the positions fully close or fully open, the
actuator runtime is ex 150% to ensure the right actuator position
synchronized to the control algorithm.
(
RDF3..., 4...:
SW < 3.1: + 20%).
3. After the actuator reaches the position calculated by the controller, a waiting
time of 30 seconds is applied to stabilize the outputs.
The electrical heater receives an
ON
command via the auxiliary heating control
output Y21:
1. When the acquired room temperature is below “setpoint for electrical heater”.
2. When the electrical heater has been switched off for more than 1 minute.
The
OFF
command for the electrical heater is output:
1. When the acquired room temperature is above the setpoint (electrical heater).
2. When the electrical heater has been switched on for more than 1 minute.
A safety thermostat (to prevent overheating) must be provided externally.
The demand calculated by PI control from the current room temperature and
setpoint is provided via Y10 and Y20 to the valve actuator as a continuous
DC 0...10 V signal.
Overview of control
outputs
on/off control signal
(2-position)
3-position control
signal
Electrical heater
control signal
(2-position)
Caution!
DC 0..10 V control
signal
