RWD44U Controller Installation and Commissioning Guide
Document Number 129-408
October 5, 2009
Siemens Industry, Inc.
Page 9 of 10
Installation
Mounting Notes
Figure 7. Mounting Options.
The RWD44U can be mounted as follows:
Observe all local installation and mounting regulations.
A
On a DIN rail (EN 50 022-35 × 7.5) at least 4.75 inches (120 mm) long for
RWD44U.
B
Wall-mounted with two screws. (Minimum length of the screws should be
2.75 inches (70 mm) (
φ
3.2 mm)
C
Front-mounted using standard elements:
•
One DIN rail 5.90 inches (150 mm) long for RWD44U
•
Two hexagonal placeholders 1.96 inches (50 mm)
•
Washers
•
Screws
NOTE:
(Ensure all terminations are tightened before final mounting to front
panel.)
D
Inside the ARG62.21 (single RWD44U).
WARNING:
There must be a minimum of 0.31 inches (8 mm) distance from
terminations to panel/enclosures to avoid electric shock.
Electrical Installation
Notes
•
Standard cables can be used for the controller. However, when mounting in an
environment greatly exposed to EMI, use only shielded cables.
•
The RWD44U is designed for 24 Vac operating voltage.
•
Low voltage must comply with the requirements for safety extra-low voltage
(SELV) as per EN 60730.
•
Use safety insulating transformers with double insulation as per EN 60742; they
must be designed for 100% duty.
•
When using several transformers in one system, the connection terminals G0
must be galvanically connected.
•
Supplying voltages above 24 Vac to low voltage connections may damage or
destroy the controller or any other connected devices. Additionally, connections
to voltages exceeding 42 Vac endanger personal safety.
