IntelliPack Series 841T Transmitter/Alarm User's Manual Frequency Input
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Electromechanical Relay Contact Protection:
To maximize
relay life with inductive loads, external protection is required. For
DC inductive loads, place a diode across the load (1N4006 or
equivalent) with cathode to (+) and anode to (-). For AC inductive
loads, place a Metal Oxide Varistor (MOV) across the load. See
Relay Contact Protection Drawing 4501-646 for details.
IMPORTANT (Frequency Inputs only):
Noise and/or jitter
on the input signal has the effect of reducing (narrowing) the
instrument’s deadband and may produce contact chatter.
The long term effect of this will reduce the life of mechanical
relays. To reduce this undesired effect, you should increase
the effective deadband. Note the input averaging function of
this transmitter may also be used to reduce contact chatter.
5.
Grounding:
See Electrical Connections Drawing 4501-683.
The module housing is plastic and does not require an earth
ground connection. However, there are mounting positions
on the output terminals to connect a cable shield, plus earth
ground. These connections are isolated from the internal
circuit and are recommended to minimize noise and help
protect the unit from damaging I/O transients.
WARNING:
For compliance to applicable safety and
performance standards, the use of shielded cable is
recommended as shown in Drawing 4501-683. Further, the
application of earth ground must be in place as shown in
Drawing 4501-683. Failure to adhere to sound wiring and
grounding practices may compromise safety & performance.
3.0 MODULE CONFIGURATION
The IntelliPack module needs to be configured for your
application. Configuration is done using Acromag’s Windows 95
or NT
IntelliPack Configuration Program and Serial Port
Adapter. Transmitter calibration and configuration details are
included in the IntelliPack Transmitter Configuration Manual
(8500-570). Field calibration is only applicable to frequency input
types. Field adjustment of transmitter zero & full-scale (scaling
parameters), plus alarm setpoint & dropout (Model 841T-1500),
can be accomplished via the module’s push-buttons and LED’s in
the absence of a host computer.
FIELD CONFIGURATION (Frequency Inputs Only)
This program mode allows adjustment to key transmitter
calibration and alarm parameters in the field, without having to
connect a host computer. Field reprogrammability of zero & full-
scale, plus alarm setpoint & deadband (“-1500” units) is
accomplished via the transmitter/alarm module’s “SET”, “MODE”,
“UP”, and “DOWN” push buttons, and the zero/full-scale and
relay LED’s (see Dwg. 4501-642).
Equipment Required
•
An accurate frequency input source adjustable over the
configured input range. This source must be accurate
beyond the module specifications for best results. Use a
source with an output impedance of 100
or less. An
accurate current or voltage meter is required to monitor the
output level. This meter must be accurate beyond the
module specifications for best results.
Note:
The module’s input frequency range must already be set
via the IntelliPack Configuration Software. Frequencies outside
of the configured input range will not be accepted for zero, full-
scale, setpoint, or dropout calibration. Since input frequencies
cannot be validated during field programming, entering incorrect
signals can produce an undesired output response. Install a
jumper between
the output “I+” and “JMP” terminals for voltage
output (default), remove this jumper for current output.
Transmitter/Alarm General Field Programming Procedure
The following procedure uses the corresponding zero/full-
scale (labeled “Z/FS”) and relay (labeled “RLY”) LED’s to indicate
which parameter is being programmed. A constant ON zero/full-
scale LED refers to zero configuration (input for 0% output), a
flashing ON/OFF zero/full-scale LED refers to full-scale/span
configuration (input for 100% output). A constant ON relay LED
indicates setpoint adjustment, a flashing ON/OFF relay LED
indicates dropout/deadband adjustment. Refer to Table 3.
CAUTION:
Do not insert sharp or oversized objects into the
switch openings as this may damage the unit. When depressing
the push-buttons, use a blunt tipped object and apply pressure
gradually until you feel or hear the tactile response.
1. Connect a frequency source to the input, as required
(refer to Electrical Connections Drawing 4501-683).
2. Apply pow
er, and the module’s green “Run” LED will light.
3. Press and hold the
“MODE”
push button until the green
“Run” LED turns OFF and the yellow “Zero/Full-Scale” LED
turns ON. In this mode, the unit is ready to accept a zero
input for the transmitter (scaling input for 0% output). If you
do not wish to change the zero parameter, skip to step 7.
4. Adjust the input source near the zero level according to your
input range (value must be within input range selected). For
best results, use a frequency of 1Hz or greater. Unmeasur-
able frequencies below 1Hz are interpreted as 0Hz.
5. Press the
“UP”
or
“DOWN”
push-button one time to cause
the module to auto-adjust its output level to the
corresponding output zero according to the output range
selected. If the output is not exactly at the zero level, then
each successive depression of the “UP” or “DOWN” switch
will increment or decrement the output signal by a small
amount. Holding the switch depressed will increase the
amount of increment or decrement.
6. Press the
“SET”
push-button to accept the zero value.
Note every time “SET” is pressed, the yellow “Status” LED
will flash once and the zero output will be captured.
7. Press the
“MODE”
push button one
time. The yellow “Zero/
Full-
Scale” LED will flash on/off, indicating the unit is ready
to accept the full-scale value for setting the span (scaling
input for 100% output). If you do not wish to change the full-
scale parameter, skip to step 11.
8. Adjust the input frequency to the full-scale level according to
your input range (the value must be within the input range
selected). The module uses the zero and full-scale levels to
set the span (span = full-scale - zero).