Installation Instructions

Document No. 553 -087
Installation Instructions
August 15, 2006
Siemens Building Technologies, Inc. Page 3 of 4
24 Vac
RS-485
ALN/BLN
Ethernet
ALN/BLN
External Sensor Power
Cover Mounting Holes
Use Provided 1-3/4" Screws
Slide Out Mounting Tabs
Use Provided 3/8" or 3/4" Screws
NOTE: Only one ALN/BLN
port (RS-485 or Ethernet)
is available on each model.
6.27"
(159.23 mm)
6.16"
(156.5 mm)
Human-
Machine
Interface
Port
24V
37 38 39 40
24V 24V
BLN
RUN
FAULT
LOW BATT
COMM
HMI
123
PXC0005R1
NOTE: The RUN LED
is on solid during
normal operation.
NOTE:
USB Device port
is for future use.
Figure 2. Front View of the PXC Compact Controller (PXC24 shown).
Mounting the PXC Compact on a Surface
WARNING:
Turn OFF AC power at the circuit breaker
panel.
NOTE: This option is for energy management only
(low voltage (Class 2) applications).
Steps for Installing with a DIN Rail
1. Using wall anchors, if necessary, attach the DIN
rail to the surface.
NOTE: The PXC Compact must be positioned
to provide a 3-inch minimum clearance
for terminating wires to the ports and
connectors.
2. Align the channel on the back of the PXC
Compact with the DIN rail (see Figure 1).
3. Push in each mounting tab until it clips onto the
DIN rail.
4. Continue with Completing the Installation.
Steps for Installing without a DIN Rail
NOTE: Use the 3/4” self-drilling screws and, if
necessary, the 1-3/4” self-drilling screws for
this installation.
1. Align the PXC Compact on the mounting
surface.
NOTE: The PXC Compact must be positioned
to provide a 3-inch minimum clearance
for terminating wires to the ports and
connectors.
2. Mark the position of the mounting tab holes on
the surface.
3. If necessary, mark the position of the mounting
holes in the PXC Compact cover.
4. Drill the mounting holes and, if necessary,
insert wall anchors.
5. Secure the controller using the provided 3/4”
screws and, if necessary, the 1-3/4” screws.
6. Continue with Completing the Installation.