ATC770 Microprocessor-Based Pressure/Process Controller 41
6.3.2 SETTING THE RETRANSMISSION OUTPUT RANGE
To change or view the Retransmission Output Range Low, press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
3
shows in the upper display. Press the FUNC
key until the lower display changes to
RO.LO
. Press the ▼ or ▲ keys until the upper display
changes to the desired value. The value may be anything from 0 to the primary input full scale value,
PI.FSV
. This can act as a scale expander; i.e. if the system has a 10,000 psi transducer but usually
runs from 3,000 to 6,500, the
RO.LO
can be set to 2,500 so that the output at 2,500 psi is 0. Once
the desired value is set, press the FUNC key to lock in the value and advance to the next parameter
the Retransmission Output Range High
RO.HI
.
6.3.3 SETTING THE RETRANSMISSION OUTPUT RANGE HIGH
If
RO.HI
does not appear from the previous step, press the FUNC key until
nonE
and
GROUP
show
on the display. Press the ▲ key until
3
shows in the upper display. Press the FUNC key until the
lower display changes to
RO.HI
.
Once
RO.HI
appears, press the ▼ or ▲ keys until the upper display changes to the desired value.
The value may be anything from 0 to the primary input full scale value,
PI.FSV
. This can act as a
scale expander; i.e. if the system has a 10,000 psi transducer but usually runs from 3,000 to 6,500,
the
RO.HI
can be set to 7,500 so that the output at 7,500 psi is full scale voltage or current. Once
the desired value is set, press the FUNC key to lock in the value and advance to the next parameter,
or press A/M to return to the operating screen.
6.3.4 SETTING THE RETRANSMISSION OUTPUT FILTER
Filtering is an electrical method of averaging the output values over a period of time to arrive at a
smoother curve. This helps to eliminate short duration transients and spikes that may cause false or
spurious readings.
To change or view the Retransmission Output Filter, press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
2
shows in the upper display. Press the FUNC key until
the lower display changes to
RO.FL
. Using the ▼ or ▲ keys, select the amount of filtering desired,
from none
(OFF)
to five seconds. When finished, press the FUNC key to lock in the value. Press
A/M to return to the operating screen.
6.4 SETTING THE CONTROL OUTPUT
The control output is opto-isolated from the CPU input and output circuits. The types of Control
Outputs available are jumper and keyboard selectable between various voltages and currents.
6.4.1 SETTING THE CONTROL OUTPUT VOLTAGE OR CURRENT
The control output can have a 0-5 VDC, a 0-10 VDC, a -10 to +10 VDC, a 4-20 mA or a 0-20 mA
output. The range of output is selected from the keyboard, but the type of output must be selected by
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