Control Outputs; Overview - Siemens RDF301 Basic Documentation

Overview of control
outputs
Product no.
RDF301,
RDF301.50,
RDF301.50H,
RDF600KN,
RDF600KN/S
Note:
ON/OFF control signal
(2-position)
Electric heater control
signal
(2-position)
Caution
Adaptive temperature
compensation for
electric heater
(RDF600KN)
3-position
control signal
46 / 94
Siemens
Building Technologies
3.7

Control outputs

3.7.1

Overview

Different control output signals are available. They need to be defined during
commissioning (see below).
Control output 2-position
Y11, Y21
(2 x SPST)
*) Only on 2-pipe application
In the ACS tool, Y11 and Y21 are called Y1 and Y2.
The valve or compressor receives the OPEN/ON command via control output Y11
or Y21 when...
1. the acquired room temperature is below the setpoint (heating mode) or above
the setpoint (cooling mode).
2. the control outputs have been inactive for more than the "Minimum output
OFF-time" (factory setting 1 minute, adjustable via parameter P48).
OFF command when...
1. the acquired room temperature is above the setpoint (heating mode) or below
the setpoint (cooling mode).
2. the valve has been active for more than the "Minimum output on-time" (factory
setting 1 minute, adjustable via parameter P49).
The electric heater receives an ON command via the auxiliary heating control
output (Y..., see Mounting Instructions) when...
1. the acquired room temperature is below the "Setpoint for electric heater"
2. the electric heater has been switched off for at least 1 minute.
The OFF command for the electric heater is output when...
1. the acquired room temperature is above the setpoint (electric heater)
2. the electric heater has been switched on for at least 1 minute.
A safety limit thermostat (to prevent overtemperatures) must be provided externally.
When an electric heater is connected directly to the ON/OFF Y21, the current
causes the relay contact to heat up. This falsifies the reading of the internal
temperature sensor. The thermostat compensates the temperature if the rated
current/power of the electric heating is entered in the parameters.
P45 (load current el. Heater): Factory setting 0kW, setting range: 0.0...1.2 kW.
Output Y11 provides the OPEN command, and Y21 the CLOSE command to the
3-position actuator.
The factory setting for the actuator's running time is 150 seconds. It can be
adjusted via parameter P44.
The parameter is only visible if 3-position is selected via DIP switches.
RDF301, RDF301.50..., RDF600KN, RDF600KN/S
2-position 3-position
PWM
Y11, Y21 *)
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(1 x
Basic Documentation
DC 0...10 V
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CE1P3171en
2017-12-07