Adtech ACX 240 Instruction Manual

1.0 INTRODUCTION
These instructions refer to the above model. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, see page 4 or refer to the Data
Bulletin. All ADTECH instruments are factory calibrated and
supplied with a label detailing the calibration. Adjustments are
normally not necessary. A simple check should be performed
to verify calibration before installation to ensure that it matches
the field requirement.
2.0 GENERAL DESCRIPTION
The ADTECH Model ACX 240 Universal Range Isolated Two­
Wire Transmitter provides high accuracy conversion of
AC Current or Voltage input signals. Typically 0-5 AMPS or
0-120 VAC to a standard process signal output of 4-20 ma de.
It covers Oto 5 Amps AC, and 0 to 250 Volts AC in 4 major
ranges.
The ACX 240 provides 600 Volts AC or 1000 Volts DC isolation
from the input to output/power supply.
The following are some outstanding features of this model.
• Field adjustable via a sixteen position rotary switch and
jumpers inside the unit.
• Selectable response, true RMS or Average.
• High accuracy, repeatability and ambient effect stability.
• NO INTERACTION of ZERO and SPAN.
• Small size-DIN mounting package 1 "w x 3.1 "h x 3.6d.
• Options for NEMA housing SNAP TRACK or surface
mounting and explosion proof housing.
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
DIN rail mount enclosure as standard. NEMA 4, 7 or 12
enclosures are optionally available. Installation area/location
must agree with the supplied instruments including operating
temperature and ambient conditions. For detailed mounting
and installation information refer to page 4 inside.
Electrical Connections
The wire used to connect the instrument to the control system
Input / Output should be twisted pair(s) and sized according to
normal practice. Shielded cable is not normally necessary (if
used, the shield must be grounded at the input of the ADTECH
instrument and left floating at the sensor).
A six position compression terminal block is provided for the I/
0 and power connections. A housing ground terminal is not
required due to non-metallic housing.
ACX 240
Two-Wire Isolated AC Current/Voltage Transmitter
Instruction Manual
Controls
Instrument controls consist of the following:
• A two position and a four position jumper for input range.
• One 16 position rotary switch for COARSE SPAN.
• One2 position jumper forMeasurement response (TRMS
or Average).
• Two External multiturn potentiometers for Fine Zero and
Span.
4.0 MAINTENANCE
These instruments are electronic and require no maintenance
e xc e pt periodic cleaning and calibration.
If the unit appears to be mis-operating, field wiring and/or
associated circuits should be checked. MOST problems are
traced to these areas.
If the problem appears to be the instrument, it may be checked
as installed or removed for a bench check as detailed in
sections 6.0 and 7.0.
5.0 CONNECTIONS
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary sheets.
-1-
JIN
-�
ADTECH
ACX240
TWOWIRE
TRANSMTR
+
=
P.S.
RL
(9/96) 190-A-000066-A