Siemens RDG400 Basic Manual

25/44
Siemens RDG400 Basic Documentation CE1P3182en
Building Technologies 2015-05-20
4.8.2 Control output for electric heater, radiator and
heating/cooling coil
The valve receives an 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, adjustable via parameter P48).
The 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, adjustable via parameter P49).
The electric heater receives an ON command via the auxiliary heating control
output (Y1) when…
1. the acquired room temperature is below "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
setpoint is provided 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
YE
DC 0 ... 10 V
Y1G
L
N
Y1 L
Q
5.7 kW
max.
N1
U1
FF
F...
Y1
K...
G0
G
G
3181D21
G
G0
Y
PWM
AC 24 V
N1 RDG400
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
(2-position)
Electric heater control
signal
(2-position)
Caution
DC 0...10 V
for electric heaters

Siemens RDG400 Specifications

General

Brand	Siemens
Model	RDG400
Category	Thermostat
Language	English