Series 651T/652T/653T Isolator User’s Manual Process Current Two-Wire Transmitters
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5.0 SERVICE AND REPAIR
WARNING:
To prevent electric shock, be sure to remove the
I/O signals/power before unplugging the terminals to uninstall
the module or before attempting service. All connections
should be made with power removed.
SERVICE AND REPAIR ASSISTANCE
This module contains solid-state components and requires no
maintenance, except for periodic cleaning and isolator zero and
span verification. Since Surface Mounted Technology (SMT)
boards are generally difficult to repair, it is highly recommended
that a non-functioning module be returned to Acromag for repair.
The board can be damaged unless special SMT repair and
service tools are used. Further, Acromag has automated test
equipment that thoroughly checks and calibrates the performance
of each module. Please refer to Acromag’s Service Policy
Bulletin, or contact Acromag for complete details on how to
obtain service parts and repair.
PRELIMINARY SERVICE PROCEDURE
Before beginning repair, be sure that all installation and
configuration procedures have been followed and that the unit is
wired properly. Verify that power is applied and that your power
supply voltage is sufficient to supply full-scale current into the
load (0.020*R), plus 12V at the module terminals, plus any line
drop. The output sense resistor can be used to monitor the loop
current without breaking the loop by connecting a DVM between
output SNS and OUT-, and measuring the corresponding voltage
drop across 10
Ω
. If you continue to have a problem with the unit
after making these checks, then an effective and convenient fault
diagnosis method is to exchange the questionable module with a
known good unit.
Acromag’s Application Engineers can provide further
technical assistance if required. When needed, complete repair
services are available from Acromag.
6.0 SPECIFICATIONS
651T-0600
, Single, 2-Wire, Process Current Isolation Channel
652T-0600
, Dual, 2-Wire, Process Current Isolation Channels
653T-0600
, Single Input, Dual Isolated 2-Wire Current Outputs
General:
The Series 65xT transmitter/isolators accept 4 to
20mA process current input signal(s), provide input-to-output
and channel-to-channel isolation, and generate 4 to 20mA
output signal(s). These isolators are connected in two-wire
fashion with the output signal and power sharing the same
leads. The 653T unit acts as a signal splitter, with one input
driving 2 isolated two-wire outputs. These isolators are DIN-
rail mounted with plug-in type terminal blocks. Units are
calibrated via zero and span adjustment potentiometers
accessible from the front panel of the unit. Each channel
includes a green LED to indicate loop power.
MODEL NUMBER DEFINITION
Transmitters are color coded with a white label. The prefix “6”
denotes Series 600 Isolators, “5” denotes two-wire power
versions, “X” denotes the isolation channel configuration, the “T”
suffix specifies that this device is a transmitter/isolator.
65xT:
Two-wire, single channel (651T), dual channel (652T),
and single input/dual output (653T), transmitter/isolators
for process current I/O.
-0600:
The four digits of this model suffix represent the following
options, respectively:
0 = Option specifier - no option;
6 = Output is DC current;
0 = Enclosure is DIN rail mounted;
0 = Approvals: CE marked, UL and cUL listed.
Hazardous Locations: Class 1; Division 2; Groups A,
B, C, D
INPUT SPECIFICATIONS
The following paragraphs summarize this model’s input type and
range, plus applicable specifications.
DC (Process) Current:
4 to 20mA DC, 3 to 25mA range typical.
Reference Test Conditions:
4 to 20mA input/output current;
R-load = 500
Ω
; Supply = 24VDC; Ambient = 25
°
C.
Input Reverse Polarity Protection:
Diode included.
Input Overvoltage Protection:
Bipolar Transient Voltage
Suppressers (TVS), 5.6V working, 7.6V clamp level typical.
Input Forward Voltage Drop:
Less than 1.5V typical for
651T & 652T units, or 3V typical for 653T units.
General Input Specifications
Common Mode Noise Rejection:
100dB at 60Hz, typical.
Normal mode Noise Rejection:
-5dB at 60Hz, with a 100
Ω
source, typical.
Input Bandwidth:
-3dB at 45Hz, typical, with 500
Ω
load.
OUTPUT SPECIFICATIONS
DC Process Current Output Specifications:
Output Range:
4 to 20mA DC, 3 to 25mA range typical.
Output Ripple:
Less than
±
0.1% of output span.
Output Limiting:
Output current is limited to less than
36mA, typical.
General Output Specifications:
Response Time:
For a step change in input signal, the
output reaches 98% of final value in less than 15ms
typical, with 500
Ω
load. Response time will vary with
load resistance.
Accuracy:
Better than
±
0.1% of output span (
±
16uA) typical.
This error includes the combined effects of isolator
repeatability, hysteresis, terminal point linearity, and
adjustment resolution. It does not include sensor error.
Accuracy Versus Temperature:
Better than ±0.006% of
input span per
°
F (
±
0.01% per
°
C) over the ambient
temperature range for reference test conditions. This
specification includes the combined effects of zero and
span drift over temperature.
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