Series 655T/656T Transmitter User's Manual mV/TC Input
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IMPORTANT:
Power, input, and output (I/O) wiring must be in
accordance with Class I, Division 2 wiring methods Article 501-
4(b) of the National Electrical Code, NFPA 70 for installations in
the U.S., or as specified in section 18-1J2 of the Canadian
Electrical Code for installations within Canada and in accordance
with the authority having jurisdiction.
This equipment is suitable for use in Class I, Division 2,
Groups A, B, C, and D, or non-hazardous locations only.
WARNING
– EXPLOSION HAZARD
– Substitution of
components may impair suitability for Class I, Division 2.
WARNING
– EXPLOSION HAZARD
– Do not disconnect
equipment unless power has been switched off or the area is
known to be non-hazardous.
CAUTION
–
To reduce the risk of fire or electric shock, do not
interconnect the outputs of different class 2 circuits.
CONFIGURATION CONTROLS
Configuration of this transmitter is accomplished via external
DIP switches and toggle switches provided for each channel and
described below:
Toggle Switches (Each Channel, See Drawing 4501-779):
The following SPDT toggle switches are used to configure the
transmitter’s zero and full-scale end points (input to output
scaling) and are located on the front panel. Adjustment via
these switches may be locked out via DIP switch 12 (see
below).
Z (Zero) Up/Down -
Used to adjust the
Zero
endpoint during
field configuration. With a zero input signal applied,
depress this toggle to the UP direction to raise the output
zero level, or DN to lower the output zero level.
FS (Full-Scale) Up/Down -
Used to adjust the
Full-Scale
endpoint during field configuration. With the full-scale
input signal applied, depress this toggle to the UP
direction to raise the full-scale output level, or DN
direction to lower the full-scale output level.
NOTE:
Note that the zero and full-scale adjustments take
effect immediately and are saved to non-volatile memory
after 15 seconds of toggle switch inactivity. Please wait
the requisite time before powering down following
adjustment or your configuration settings will be lost.
DIP Switches (See Dwg. 4501-779 For Location):
Options Configuration
- Used to select the input range/type,
enable or disable TC break detection, set upscale or
downscale TC break detection, enable or disable CJC,
enable or disable linearization, and lock or unlock
zero/full-scale reconfiguration. Refer to Drawing
4501-779 and INSTALLATION section to set switches.
Input - Range (S1-4):
The transmitter can be configured
to accept any one of fifteen TC and voltage ranges. Input
ranges are already factory calibrated.
Input - Break Detection Enable/Disdable (S8):
Enable
or disable sensor break detection. Set up or down
direction separately (switch 9).
Input - Sensor Break (S9)
: The signal detent for
detection of a sensor failure (TC) can be set to upscale or
downscale. Ignored if break detection is disabled via
switch 8.
Input - CJC (S10):
Cold Junction Compensation may be
turned ON or OFF for thermocouple input ranges. CJC
should be set to ON when directly connecting a
thermocouple to the module (default), but CJC can be set
to OFF when connecting a millivolt source, representing
temperature, directly to the module’s input terminals in
order to configure zero and full-scale. CJC is ignored for
voltage input ranges.
Input - Linearization (S11):
Linearization can be turned
off for an output response that is linear with millivoltage,
or ON for a response that is linear with temperature.
Economy Model 656T-E600 units do not support
linearization of the TC inputs.
Unlock Reconfiguration (S12):
This switch is normally
enabled (locked) and must be set ON to unlock the
reconfiguration capability of the Z/FS front-panel toggle
switches. It is provided as an extra level of security to
help prevent inadvertent reconfiguration or tampering in
the field.