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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
3.7.3 Control output for electric heater, radiator and heating/
cooling coil
The valve receives an
Open/On
command via control output Y1 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).
Off
command for valve output 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).
The electric heater receives an
On
command via output Y1 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 thermostat (to prevent overheating) must be provided externally.
∂
The demand calculated by PI control from the current room temperature and the
setpoint are delivered via Y10 as a modulating DC 0...10 V signal
∂
The signal converter (SEM61.4) converts the DC 0...10 V signal to AC 24 V
PDM pulses for the current valve
∂
The current valve (SEA45.1) supplies the electric heater with AC 50…660 V
pulsed current
Y
E
DC 0 ... 10 V
Y1 G
L
N
Y1
L
Q
5.7 kW
max.
N1
U1
FF
F...
Y1
K...
G0
G
G
3
1
8
1
D
2
1
G
G0
Y
PWM
AC 24 V
N1 RDG400KN
U1
Signal converter SEM61.4 (see Data Sheet N5102)
Y1
Current valve SEA45.1 (see Data Sheet N4937)
K… Safety loop (e.g. safety thermostat and high-temperature cutout)
FF Very fast-acting fuse
F… Overcurrent trip
On/Off control signal
(valve, 2-position)
Electric heater control
signal
(2-position)
Caution
DC 0...10 V
for electric heaters