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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
Wiring Diagram: LBW-420-1 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-420-1 is supplied
by the 24 VDC power supply #1 only. The power supply must
supply all power for the LBW-420-1. Refer to the specifications
page for the power requirements for the LBW-420-1. 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 3 below:
