Keri Systems SB-293 - Manual (Page 54)

Technical Reference Manual – PXL-250 and SB-293 Keri Systems, Inc.
Page 54 P/N: 01836-004 Revision 5.5
9.8 TB-2 – Earth Ground/12 VDC Power Connection
The PXL-250 controller requires 12 VDC power at 1 A. You should make a quality
earth ground connection to the controller prior to connecting the DC power lines. The
earth ground provides protection for the controller and ensures the best possible
operating conditions. Refer to the System Cautions – Earth Ground section starting on
page 22 for more information regarding earth grounding.
Possible sources for earth ground are a ground rod, a cold water pipe, a steel building
frame, the electrical system ground at the breaker/fuse box, or the telephone system
ground.
Refer to Table 13 and Figure 9-12 and make the following connection to attach the
earth ground and then the 12 VDC power lines.
Figure 9-12: Earth Ground and 12 VDC Power Connections
NOTE: Keri Systems does not recommend sharing a power supply between the PXL-
250 controller and an electric locking device. Transients generated as the electric
locking device is energized/de-energized can affect controller operation.
NOTE: The power TB-2 is colored red to make it easier to tell it apart from the
network connection (TB-1).
Table 13: Earth Ground and 12 VDC
Power Connections
TB-2 Description
Pin 1 Positive 12 VDC Power Line
Pin 2 Negative 12 VDC Power Line
Pin 3 Earth Ground