Control Output For Electric Heater, Radiator And Heating/ Cooling Coil - Siemens KNX RDG400KN Basic Documentation

On/Off control signal
(valve, 2-position)
Electric heater control
signal
(2-position)
Caution
DC 0...10 V
for electric heaters
48 / 86
Siemens
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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
L
G
Y
N1
DC 0 ... 10 V
G0
N
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
RDG400KN,RDG405KN Basic documentation
FF
G Y E
F...
PWM
U1
AC 24 V
G0 Y1 G
Y1 G L
Y1
Q
K...
5.7 kW
max.
CE1P3192en
2019-04-12