PRECISION DIGITAL PD2-6210, Инструкция по эксплуатации

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Helios Large Display Analog Input Batch Controller Instruction Manual PD2-6210
46
Sample Relay Operation
The sampling function allows the operator to set a set point for a “sampling” relay. This can be done for
the rate, total, or grand total. Each time the relay reaches the set point, it will close that relay’s contacts
for a programmed period of time. A rate sampling relay will activate for the sample time (
sam t
), up to
600.0 seconds, every time the set point rate is reached.
A total sampling relay will activate for the sample time (
sam t
), up to 600.0 seconds every time the
process has batched the amount programmed for the set point, and every time this amount has been
batched afterward. (See the diagram below for more details). The utility of this function can, of course, be
expanded beyond sampling and be used whenever a timed relay output closure is required when the
batch total interval reaches a certain set point.
Scaling the 4-20 mA Analog Output (
Aout
)
The 4-20 mA analog output can be scaled to provide a 4-20 mA signal for any display range selected.
No equipment is needed to scale the analog output; simply program the display values to the
corresponding mA output signal.
The
Analog Output menu is used to program the 4-20 mA output based on display values.
For instructions on how to program
numeric values see Setting
Numeric Values, page 31.
Reset Menu (
reset
)
The
Reset
menu is used to reset the maximum or minimum reading (peak or valley) reached by the
process; both may be reset at the same time by selecting “reset high & low” (
rst HL
). The tare value
used to zero the display may be reset by selecting “reset tare” (
rst tr
).
Control Menu (
Contrl
)
The Control menu is used to control the 4-20
mA analog output and the relays manually,
ignoring the input. Each relay and analog
output can be programmed independently
for manual control. Selecting automatic
control sets all relays and analog output for
automatic operation.
Contrl
Auto
man a out
rly 1 rly 4
off on
Contrl
Contrl man man man
a out rly 1 rly 4
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