Siemens RDG400 manual ON/OFF control signal, Electrical heater control signal 2-position

4.8.2Control output for electrical heater, radiator and heating / cooling coil

ON/OFF control signal

(2-position)

Electrical heater control signal (2-position)

Caution

DC 0 ... 10 V for el. heaters

The valve receives an OPEN/ON command via control output Y1

1.When the acquired room temperature is below “setpoint” (heating mode) or above the setpoint (cooling mode)

2.When the control outputs have been inactive for more than the “Minimum output off-time” (factory setting 1 minute, adjustable via parameter P48).

OFF command for valve output:

1.When the acquired room temperature is above the setpoint (heating mode) or below the setpoint (cooling mode).

2.When the valve has been active for more than the “Minimum output on-time” (factory setting 1 minute, adjustable via parameter P49).

The electrical heater receives an ON command via the auxiliary heating control output (Y1):

1.When the acquired room temperature is below “setpoint for electric heater”.

2.When the electrical heater has been switched off for at least 1 minute.

The OFF command for the electrical heater is output:

1.When the acquired room temperature is above the setpoint (electric heater).

2.When the electrical 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 continuous 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 el. heater with AC 50 … 660 V pulsed current.

L							3181D21
G						FF
			G Y
				E		F...
	Y	N1	PWM
					U1
			AC 24 V
			G0 Y1 G
	DC 0 ... 10 V				L
			Y1	G

Q

Y1

G0

N

K...

5.7kW

max.

	N1	RDG400
	U1	Signal converter SEM61.4	(see data sheet N5102)
	Y1	Current valve SEA45.1	(see data sheet N4937)
	K…	Safety "chain", e.g. safety thermostat and high-temperature cut-out
	FF	Very fast-acting fuse
	F…	Overcurrent trip
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Siemens	RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation			CE1P3182en
Building Technologies	Functions			28 May 2009