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Page 51 of 56
•
The 4-20 mA passive receivers do not
contain a voltage source to power the loop
current. They require the addition of a
separate isolated power supply. Typically a
supply that delivers 15 to 20 volts DC at 50
mA is sufficient. Wire these as in Figure 3.
Note that some 12-volt DC wall transformers
(as used on portable equipment) may deliver
15 to 20 volts when they are lightly loaded.
•
Be sure that both the power supply used and
the passive receiver are floating (not
connected to earth ground). If either is not
floating, the circuit will not work and damage
may occur.
•
Ensure that the analog jumper is set as
follows:
o
Non-SMV units: SW101 is set to the “I”
position before power is applied.
o
SMV units: JMP3 is set to pins 2&3 before power is applied.
JUMPER IS SET TO ‘I’ or 2&3
Figure 3
