P a g e
| 14
Rev. 2.1 7-7-2017
Copyright © 2017 by Cool Air Incorporated. All rights reserved.
Wiring Diagram: LBW-420-LEL with (2) – 24 VDC
Power Supplies
In this configuration, with the jumper J3 in the rightmost position
(which connects pins 1 & 2), power for the LBW-420-LELis
supplied by the 24 VDC power supply #1 only. The power supply
must supply all power for the LBW-420-LEL. Refer to the
specifications page for the power requirements for the LBW-420-
LEL. The power for the 4-20 mA circuit is supplied by the 24 VDC
power supply #2. The 4-20 mA circuit is a simple series circuit that
includes the LBW detector, a power supply, and the receiving
device. It is recommended that a 24 VDC low-noise power supply
be used for this application, although power supplies providing a
minimum of 10 VDC to a maximum 30 VDC can be used. The
voltage drop across the detector and the receiver together must not
exceed the power supply voltage. This circuit is shown in Figure 2
below:
FIGURE 2
