Technical Instructions
RWD68U Universal Controller
Document Number 155-738
January 14, 2005
Wiring Diagrams
TH0763R1
G0
Q11
D1 M
X1 M
X2 M
G
Q14
Y1
M
Tool
Q12
Figure 21. RWD68U Wiring Diagram.
D1 Digital
input
G, G0
24 Vac supply
M
Ground (G0) for signal inputs and
universal inputs and analog
outputs
Q11
Common for digital contact
Q12
NC digital contact
Q14 NO
digital
contact
X1
Signal input (main input: Siemens
Ni 1000, Pt 1000 and
0 to10 Vdc)
X2
Signal input (aux. Input:
Siemens Ni1000, Pt 1000,
0 to10 Vdc and 0 to 1000
Ω
or
0 to 10 Vdc remote setpoint)
Y1 Analog
output
Tool
Communication port for PC
(9-pin
plug)
TH0764R1
Y1
G
Y1
S1
D1
GO
Y..
B M
B M
X1
X2
M
M
X2
X1
M
M
GO
G
24 V SN
24 V SP
N1
TOOL
PC
Q12 Q14
Q11
Q1
E1
G
G
E1 Electrical
load
N1 RWD68U
Controller
PC Personal
computer
Q1
Potential-free relay contacts for two-position control
S1
Time clock or switch
SN System
neutral
SP System
potential
X1
Main input (Termination G appears when X1 is an active sensor)
X2
Auxiliary input or remote setpoint (Termination G appears when X2 is an
active
sensor)
Y1
Valve actuator/Damper actuator
Figure 22. Connection Diagram.
CAUTION:
If you use a DESKTOP computer, the TOOL signal ground is
galvanically connected to G0 inside the controller. If the signal line of
the computer is grounded to Earth, the G0 line after TOOL connection
will be grounded as well.
Page 10
Siemens Building Technologies, Inc.
