Saia-Burgess Controls AG
Manual for PCD7.L79xN room controllers
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Document 27 / 602
E
N02 │ 2013-11-27
Type description
Technical data
6-11
6
6.2.4 Technical data for PCD7.L793N
24 V
AC
compact room controller for heating or cooling with 2 TRIAC outputs to
control two thermal valves (PWM) or one 3-point valve (open/close), 2 × 0…10 V
outputs to control 2 valves, cooled ceilings or variable air volume (VAV) systems,an
integrated temperature sensor and 2 digital inputs, one 0..10 V input, with analogue
operation for set-point setting and presence sensor with LED display.
S-Bus
RS485
Service
Pin
/D
D
E1
E2
Aux
Input
Window
Contact
Y1
24V
24V
800 mA
PCD7.L793N
3
1
2
6
4
5
6
7
8
8
7
5
2
4
3
1
Power
Supply
24VAC
Y2
Y4
Y3
E3
0-10V
2mA
Aux.
0-10V
A
B
-
+
Designation
Terminal
Description
Power supply
24 V, GND
24 V
AC
, 1.5 W typ. without actuating drives.
Outputs
Terminal
Valves Y1/Y2
Y1, GND , Y2
Triac outputs 24 VAC, 10
…
800 mA to control 2
valves with PWM signal or one 3-point valve.
When Y1 and Y2 are used at the same time, then
the max. output current will be 800 mA for both
combined.
Valves Y3/Y4
Y3, GND , Y4
Constant voltage outputs 0…10 V, 2 mA max. to
control 2 valves.
Inputs
Terminal
Window contact
E1, window
contact
Digital input for floating contacts.
Additional input
E2, aux input
Additional digital input for floating contacts.
Voltage input
E3, Aux 0…10 V Voltage input 0...10 V for optional use via S-Bus.
Communication
Terminal
Communication
/D, D
SBC
Serial S-Net, slave, data mode
Interface
RS-485, max. cable length 1200 m, max. stations
see technical data
Transmission rate
4
800, 9
600, 19 200, 38 400, 115 200 bit/s with
automatic detection after restart
Note
For a detailed description of the inputs/outputs, see "General technical specification".