Installation and Operations Guide
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ACM-VLX/VLX/EXP/AXM
36
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
After general information about cable, shield grounding, and jumper location,
this section provides individual connection details and jumper settings for the
most common input types.
Resistive inputs (thermistors and potentiometers)
Wire the potentiometer leads across the desired IN terminal and the adjacent
COM terminal. No polarity.
Set jumper to position 1.
Note The VLX/ACM-VLX and EXPs/AXMs do not support the Microset or
Microtouch.
Dry contact inputs
Dry contact inputs are electrically identical to resistive inputs. Wire the input
leads across the desired IN terminal and the adjacent COM terminal. No polarity.
Note After installing the dry contact input, test that the contact produces
appropriate count values as wired to produce ON and OFF signals. See “Inputs
(AIs and BIs)” on page 59.
Set the input jumper to position 1.
4–20mA inputs
Wiring scenarios depend on the type of 4-20mA device. For two-wire devices,
the +20 VDC output terminal on the EXP/AXM can provide power.
Terminal identification Terminals for inputs are labeled IN n. See the
specific wiring guidelines for the type of input for
wiring instructions.
Cable Use 18 AWG, shielded, twisted-pair wire for all
input connections.
Shield grounding Ground only the EXP/AXM side of the cable
shield to panel ground.
Do not ground both sides of the shield.
Differences in ground potential may exist from
one end to the other and cause current on the
shield.
Jumper identification Jumpers for input configuration are labeled
according to the input they affect. J1 corresponds
to IN 1, and so on. Each jumper is located beneath
the hinged cover doors beside the input terminal it
affects.
2345
1
2345
1
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