Basic Documentation

Functions
Control outputs
4
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A6V12114068_en--_c
4.7 Control outputs
4.7.1 Overview
Different control output signals are available and defined during commissioning
(see below).
Control output
On/Off
3-position
Product No.
RDF660MB/MM
RDF660MB
Y1, Y2
(2 x SPST)
Y1, Y2
*
(1 x / )
*)
Only on 2-pipe application
The valve receives the Open/On command via control output Y1 or Y2, if
1. The acquired room temperature is below the setpoint (for heating) or above the
setpoint (for cooling).
2. The control outputs have been inactive for more than the "Minimum output off
time" (factory setting 1 minute, adjustable via P48).
The valve receives the Off command, if
1. The acquired room temperature is above the setpoint (for heating mode) or
below the setpoint (for cooling mode).
2. The valve has been active for more than the "Minimum output on time" (factory
setting 1 minute, adjustable via P49).
The electric heater receives an On command via the auxiliary heating control
output (Y..., see Mounting Instructions [➙ 5] [1]), if
1. The acquired room temperature is below the "Setpoint for electric heater".
2. The electric heater is switched off for at least 1 minute.
The Off command for the electric heater is output, if
1. The acquired room temperature is above the setpoint (electric heater).
2. The electric heater is switched on for at least 1 minute.
CAUTION! A safety limit thermostat (to prevent over-temperature) must be
provided externally.
When an electric heater is connected directly to the On/Off Y2, 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 parameter P45 (load current electric heater):
factory setting: 0 A, setting range: 0.0…5.0 A.
Heating: Output Y1 provides the Open command, and Y2 the Close command to
the 3-position actuator.
The factory setting for the actuator run-time is 150 seconds and can be adjusted
via P44.
The parameter is visible only, if 3-position is selected via DIP switch 2.
1. After the thermostat is powered up, a close command for the actuator run time
by + 150 % is issued to ensure the actuator closes fully and synchronizes to
the control algorithm.
2. When the thermostat calculates "fully close" or "fully open", the actuator run
time is extended by + 150 % to ensure the correct actuator position is
synchronized to the control algorithm.
3. After the actuator reaches the position calculated by the thermostat, a waiting
time of 30 seconds is applied to stabilize the outputs.
Electric heater control
signal (On/Off)
(RDF660MB only)
Adaptive temperature
compensation for
electric heater
(RDF660MB only)
Overview of control
outputs
On/Off control signal
(2-position)
3-position
control signal
Synchronization