RWD68U Universal Controller
Technical Instructions
Document Number 155-738
January 14, 2005
Installation Notes
The RWD68U Controller can be mounted as follows:
NOTE:
Observe all local installation regulations and building codes.
A
On a DIN rail at least 4.7 inches (120 mm) long
B
Wall-mounted with two screws
C
Front-mounted using standard hardware:
•
One DIN rail 5.9 inches (150 mm) long
•
Two hexagonal blocks 1.97 inches (50 mm)
•
Washers and screws
D
In the ARG62.21 protective housing
A
B
C
D
TH0550R1
Figure 20. Mounting Options.
Electrical Installation Notes
CAUTION:
•
Standard cables can be used for the controller. However, when
mounting in an environment greatly exposed to Electrical Magnetic
Interface (EMI), use only shielded cables.
•
The RWD68U is designed for 24 Vac operating voltage.
•
Use safety insulating transformers with double insulation; they
must be designed for 100% duty.
•
When using several transformers in one system, the connection
terminals G0 (ground) must be galvanically connected.
•
Supplying voltages above 24 Vac to low voltage connections may
damage or destroy the controller or any other connected devices.
•
Connections to voltages exceeding 24 Vac endanger personal
safety.
•
The ARG62.21 Protective Housing does not provide grounding
between conduit connections. Use grounding bushings and jumper
wires or equivalent.
Commissioning Notes
A commissioning booklet is included with the RWD68U Controller.
Observe the following:
•
The controller must be configured for application-specific operation using the
standard application number.
•
Application-specific fine tuning can be performed if required (see the
commissioning booklet
).
•
Power supply to the controller and the connected devices must be guaranteed.
•
Values and settings entered remain available even on power failure.
Siemens Building Technologies, Inc.
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