IntelliPack Series 811T Transmitter/Alarm User's Manual DC Voltage/Current Input
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be scaled to 0% and 100% at the transmitter analog output.
The scaling may also be adjusted in-field via front panel
push-
buttons and status LED’s.
Transmitter - Computation:
The following gives a brief
description of current available transmitter computation
functions:
•
None (Default):
Each input sample is converted into a
directly proportional output update.
•
Square Root:
Each input sample is converted into a
corresponding output update that is the square root of
the input signal. The output in percent is computed as
the square root of the product of the input in percent
multiplied by 100%.
•
Linearizer:
Permits the entry of up to 25 user-defined
input-to-output break points to facilitate up to 24
segment linearization of a non-linear sensor signal.
Alarm Configuration (Model 811T-1500)
Model 811T-1500 units
may also be configured for simple limit alarms. You may also
refer to the IntelliPack 800A alarm family for dedicated alarm
modules that support other operating functions.
Alarm - Input:
The input signal range to the alarm is the full
range for the configured input type. Example: if 4-20mA input
was selected using the configuration program, the alarm can
be programmed to any setpoint from 0 to 20mA. If input
averaging is used, an averaged input value will be used by
the alarm.
Alarm - Mode:
Select a High or Low limit for the limit alarm
function of this model. The relay will trip on an increasing
input signal for a high limit, and on a decreasing input signal
for a low limit.
Alarm - Setpoint:
A high or low setpoint (plus deadband) may
be assigned to the relay and is programmable over the entire
input range. The relay will enter the alarm state when either
the user-defined high or low setpoint is exceeded for the
specified amount of time (this allows input transients to be
filtered). Relay remains in the alarm state until the input
signal has retreated past the defined setpoint, plus any
deadband, for the specified amount of time. Please refer to
the IntelliPack alarm family for dedicated alarm modules that
support other operating functions.
Alarm - Deadband:
Deadband is associated with the setpoin t.
Deadband settings for bipolar input ranges should be limited
to 50% or less of the range selected. Unipolar input ranges
support deadband settings up to 100% of the range selected.
Deadband determines the amount the input signal has to
return into the “normal” operating range before the relay
contacts will transfer out of the “alarm” state. Deadband is
normally used to eliminate false trips or alarm “chatter”
caused by fluctuations in the input near the alarm point. Note
that deadband may also apply to latched alarms. If the alarm
is latching, it is recommended that the deadband be set to a
minimum.
IMPORTANT:
Noise and/or jitter on the input signal has
the effect of reducing (nar
rowing) the instrument’s
deadband and may produce contact chatter. Another
long term effect of contact chatter is a reduction in the
life of the mechanical relay contacts. To reduce this
undesired effect, increase the deadband setting.
Relay - Time Delay:
Programmable from 0 milliseconds to 25.5
seconds in 100ms increments for this model (used to help
filter input transients and avoid nuisance alarming). A
minimum delay of 100ms is recommended for increased
noise immunity & conformance to applicable safety
standards. This delay does not apply to control of the
transmitter’s analog output.
Relay - Operating Mode:
User configurable for “failsafe”
operation (relay deenergized in alarm state), or non-failsafe
operation (relay energized in alarm state). Failsafe mode
provides the same contact closure for alarm states as for
power loss, while non-failsafe mode uses alarm contact
closure opposite to power loss conditions. Upon power up,
relay may cycle states during diagnostic operation.
Relay - Reset:
The relay may be configured to automatically
reset when the input retreats past its setpoint and deadband,
or the relay may latch into its alarm state. Use the up or
down push-buttons on the front of the module to reset a
latched relay and exit the latched state (this may also be
accomplished under software control).
Visual Alarm Indicator:
A yellow LED (labeled “RLY”) for the
relay provides visual status indication of when the relay is in
alarm (LED is ON in alarm). This LED is also used in field
configuration mode to indicate whether setpoint or deadband
is being adjusted.
Other IntelliPack Configuration Software Capabilities
In addition to configuring all features of the module described
above, the IntelliPack Configuration Software includes additional
capabilities for testing and control of the module (see below). For
complete information on the IntelliPack Configuration Software,
refer to Transmitter Configuration Manual 8500-570.:
•
Monitors the input and output signal values and allows
polling to be turned on or off.
•
Provides a “Show Graph” function to view a graphical
representation of input signal (x) versus output signal (y).
•
Allows a configuration to be uploaded or downloaded to/from
the module. Also provides a means to rewrite a module’s
firmware
if the microcontroller is replaced or a module’s
functionality is updated.
•
Provides controls to separately calibrate the input and output
stages and restore the original factory input or output
calibration in case of error.
•
Provides separate controls to reset a module and reset a
latched alarm relay.
•
Provides a control to adjust a transmitter’s output signal
independent of the input signal (timed override).
•
Allows optional user documentation information to be written
to the module. Documentation fields are provided for tag
number, comment, configured by, location, and identification
information. This information can also be uploaded from the
module and printed via this software.
•
Allows a module’s complete configuration to be printed in an
easy to read, two-page form, including user documentation.
•
Includes on-line help and context (field) sensitive help
functions.