Parameter Usage And Selection - YOKOGAWA Dpharp vigilantplant EJA110A User Manual

8.3.2 Parameter Usage and Selection

Before describing the procedure for setting parameters,
we present the following table showing how the
parameters are used and in what case.
Table 8.3.1 Parameter Usage and Selection
Setup Item
Tag No. setup
P.8-7
Calibration range setup
P.8-7
Damping time constant setup
P.8-8
Output and integral indicator display
mode setup P.8-9
Output signal low cut mode setup
P.8-9
Integral indicator display function
P.8-10
Unit setup for displayed temperature
P.8-11
Unit setup for displayed static
pressure P.8-11
Operation mode (normal/reverse
signal) setup
P.8-12
Impulse line connection orientation
(higher pressure on right/left side)
setup P.8-12
Output status display/setup when
a CPU failure P.8-12
Output status setup when a hardware
error occurs
P.8-12
Bi-directional flow measurement
P.8-13
Range change (while applying
actual inputs)
P.8-13
Zero point adjustment
P.8-14
Test output (fixed current output)
setup P.8-15
User memo fields
P.8-16
Sets the Tag No. (using 16 alphanumeric characters).
Sets the calibration range for 4 to 20 mA DC. Sets three data items: range unit, input value
at 4 mA DC (LRV), and input value at 20 mA DC (URV).
Note: LRV and URV can be specified with range value specifications up to 5 digits
(excluding any decimal point) within the range of –32000 to 32000.
Adjusts the output response speed for 4 to 20 mA DC at amplifier.
Can be set from 0.50 to 100.00 s. (from 0.00 to 100.00 s with quick response mode on)
Sets modes for output signal and integral indicator to "Linear mode"
(proportional to input differential pressure) or to "Square root mode" (proportional to flow).
Used mainly to stabilize output near 0% if output signal is the square root mode.
Two modes are available: forcing output to 0% for input below a specific value, or changing
to proportional output for input below a specific value.
Available from the following 5 types of integral indicator scale ranges and units:
input pressure, % of range, user set scale, input static pressure, % of static pressure
range, and alternating among any four of the above.
When using the user set scale, 4 types of data should be configurated in advance:
user set scale setting, unit (BT200 only), display value at 4 mA DC (LRV), and display
value at 20 mA DC (URV).
Note: LRV and URV can be specified with range value specifications up to 5
digits (excluding any decimal point) within the range of –32000 to 32000.
Sets a unit for temperatures displayed on the BT200.
Sets a unit for static pressure displayed on the BT200.
Reverses the direction for 4 to 20 mA DC output relative to input.
Reverse mode is used for applications in which safety requires that output be
driven toward 20 mA if input is lost.
Used where installation conditions make it imperative to connect high pressure side
impulse line to low pressure side of transmitter. Reversal of orientation should be dealt with
by reversing impulse line wherever possible. Use this function only where there is no
alternative.
Displays the status of 4 to 20 mA DC output when a CPU failure. The parameter
of the standard unit is fixed to the high limit value.
Sets the status of the 4 to 20 mA DC output when an abnormal status is detected
with the capsule or the amplifier as the result of self-diagnosis. One of the
following statuses; last held, high limit, and low limit values, can be selected.
Used to measure bi-directional flows.
Output at zero flow is 12 mA DC, with output range equally divided between forward and
reverse flow.
Can be used with square root mode.
Range for 4 to 20 mA DC signal is set with actual input applied. Sets 20 mA DC output
precisely with respect to user's reference instrument output. Note that DPharp is calibrated
with high accuracy before shipment, so span should be set using the normal range setup.
Adjusts zero point. This can be done either using the external zero-adjustment screw on
the transmitteror using the BT200.
Used for loop checks.
Output can be set freely from –5% to 110% in 1% steps.
Allows user to enter up to 5 items of any desired text in up to 8 uppercase
alphanumeric characters per item.
8-6
8. BRAIN TERMINAL BT200 OPERATION
IMPORTANT
If the transmitter is turned off within 30 seconds
after parameters have been set, the set data will
not be stored and the terminal returns to previ-
ous settings.
Description
T0807.EPS
IM 01C21B01-01E