Series 655T/656T Transmitter User's Manual mV/TC Input
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- 2 -
Safety Summary - Symbols on equipment:
Means “Caution, refer to this manual for additional
information”.
The information contained in this manual is subject to change
without notice. Acromag, Inc., makes no warranty of any kind
with regard to this material, including, but not limited to, the
implied warranties of merchantability and fitness for a particular
purpose. Further, Acromag, Inc., assumes no responsibility for
any errors that may appear in this manual and makes no
commitment to update, or keep current, the information contained
in this manual. No part of this manual may be copied or
reproduced in any form, without the prior written consent of
Acromag, Inc.
Table of Contents
Page
1.0 INTRODUCTION
………………………………..……..
2
DESCRIPTION …………………………………………
2
Key 656T Features…………………………………..
3
2.0 PREPARATION FOR USE
….………………………..
3
UNPACKING AND INSPECTION ……………………
3
INSTALLATION ………………………………………..
3
Mounting ………………………………………………
4
Electrical Connections ………………………………
4
3.0 MODULE CONFIGURATION
.………………………..
4
DIP SWITCH SETTINGS………………………………
4
ZERO AND SPAN CONFIGURAT
ION……………….
5
Table 4: TC Millivoltage Versus Temperature..…..
7
4.0 THEORY OF OPERATION
…………………………..
6
5.0 SERVICE AND REPAIR
………………………………
7
SERVICE AND REPAIR ASSISTANCE …………….
7
PRELIMINARY SERVICE PROCEDURE ..………….
7
6.0 SPECIFICATIONS
…………………………………….
8
MODEL NUMBER DEFINITION………………………
8
INPUT SPECIFICATIONS …………………………….
8
OUTPUT SPECIFICATIONS…………………….……
9
APPROVALS …………………………………………..
9
ENCLOSURE/PHYSICAL SPECIFICATIONS ……..
9
ENVIRONMENTAL SPECIFICATIONS….…………..
9
CONFIGURATION CONTROLS
..…………………….
10
List of Drawings
Page
Simplified Schematic (4501-
777).……………………….…
11
Electrical Connections (4501-
778).…..…………….…..….
11
DIP Switch Locations & Settings (4501-
779)………….….
12
Enclosure Dimensions (4501-
780)….………………..……
12
REVISION HISTORY
13
IMPORTANT SAFETY CONSIDERATIONS
It is very important for the user to consider the possible adverse
effects of power, wiring, component, sensor, or software failures
in designing any type of control or monitoring system. This is
especially important where economic property loss or human life
is involved. It is important that the user employ satisfactory
overall system design. It is agreed between the Buyer and
Acromag, that this is the Buyer's responsibility.
1.0 INTRODUCTION
These instructions cover the hardware functionality of the
transmitter models listed in Table 1. Supplementary sheets are
attached for units with special options or features.
Table 1: Models Covered in This Manual
Series/
Input/Type
-Options/Output/
Enclosure/Approvals
1
-Factory
Configuration
2
655T
-0600
3
-C
656T
-0600
3
-C
656T
-E600
-C
Notes (Table 1):
1. Approvals: cULus Listed.
Hazardous Locations: Class I; Division 2; Groups A,B,C,D.
(See specifications).
2. Include th
e “-C” suffix to specify factory configuration option.
Otherwise, no suffix is required for standard configuration.
3. Model 655T-0600 units have one I/O channel, while 656T-
0600 transmitters have two independent I/O channels.
Economy Model 656T-E600 operates the same as 656T-
0600, but only supports the TC type J & K, and 0-125mV
input ranges, and provides no TC linearization.
DESCRIPTION
Series 655T/656T Transmitters are members of the popular
Acromag transmitter, isolator, and alarm family. These models
are simple, low cost, isolated, two-wire transmitters for multi-
range thermocouple or DC voltage input signals, in single (655T),
and dual (656T) channel configurations. These models are fully
reconfigurable via external DIP and toggle switches on the
module.
These models provide one or two inputs for either DC
millivolts or thermocouple input signals. The dual channels of
Model 656T units operate completely isolated and independent of
one another. Thermocouple reference-junction compensation,
linearization, and open circuit or TC break detection is included.
Front panel toggle switches are used to facilitate field calibration
of zero and full-scale. Side access DIP switches select the input
range & type, disable/enable TC break, set TC break upscale or
down-scale, turn CJC On/Off, turn linearization On/Off, and
lock/unlock zero/full-scale adjustment. The unit may be
calibrated for a normal or reverse acting output response.
The module uses a high resolution, low noise, Sigma-Delta,
Analog to Digital Converter (
-
ADC) to accurately convert the
input signal into a digitized value. An optically isolated PWM
circuit provides the corresponding process current output. These
units contain an advanced technology microcontroller with
integrated downloadable flash memory and EEPROM for non-
volatile program, configuration, calibration, and parameter data
storage. Flexible transmitter functionality, variable range inputs,
plus convenient switch programming makes this instrument
extremely versatile over a broad range of applications.
These modules are designed to withstand harsh industrial
environments. They feature RFI, EMI, ESD, EFT, and surge
protection, plus low temperature drift, wide ambient temperature
operation, and isolation between input and power/output. They
also have low radiated emissions per CE requirements.
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