Trim Analog Output - YOKOGAWA Dpharp vigilantplant EJA Series User Manual

(14) Trim Analog Output

Fine output adjustment is carried out with D/A trim or
Scaled D/A trim.
• D/A Trim
D/A trim is to be carried out if the calibration
digital ammeter does not read 4.000 mA and 20.000
mA exactly with the output signal of 0% and 100%.
• Scaled D/A Trim
Scaled D/A trim is to be carried out if the output
is adjusted using a voltmeter or other types of
meters or using a meter whose the scale unit is 0 to
100%.
Example 1: For the adjustment using an ammeter ( 1 A is
measurable)
1. Device setup
2 Diag/Service
3. Calibration
2. Trim analog output
1
EJA:
Trim analog output
1 D/A trim
2 Scaled D/A trim
Select the D/A trim item.
HELP SET HOME OK
2
EJA:
WARN-LOOP should be
removed from
automatic control
Press OK (F4).
DEL SET ABORT OK
3
EJA:
Connect reference
meter
Connect the ammeter ( 1 A is
HELP DEL ABORT OK
measurable), and press OK (F4).
4
EJA:
Setting fld dev
output to 4mA
Press OK (F4), and the transmitter
HELP DEL ABORT OK
outputs the output signal of 0%.
5
'4 . 1 1 5'
EJA:
Enter meter value
4.000
(ENTER)
HELP DEL ESC ENTER
Enter the read value 4.115 of the
ammeter, and press ENTER (F4).
(The output of the transmitter
changes.)
(OK)
(OK)
(OK)
Ammeter reading: 4.115
6
EJA:
Fld dev output 4.000
mA equal to reference
meter?
1 Yes
2 No
HELP SET
7
EJA:
Setting fld dev
output to 20mA
DEL SET
8
EJA:
Enter meter value
20.000
HELP DEL
9
EJA:
Fld dev output 20.000
mA equal to reference
meter?
1 Yes
2 No
HELP DEL
10
EJA:
NOTE-Loop may be
returned to automatic
control
HELP DEL
F0230.EPS
2-14
2. HART COMMUNICATOR OPERATION
(ENTER)
Ammeter reading: 4.000
ABORT ENTER
Because the reading on the
ammeter is 4.000 mA, select YES
and press ENTER (F4).
If the reading is not 4.000 mA,
select item 2. NO. Repeat steps
and 5 until the ammeter reads
4.000 mA.
(OK)
Press OK (F4), and the transmitter
ABORT OK
outputs the output signal of 100%.
'1 9.0 5 0'
(ENTER)
ABORT ENTER
Ammeter reading: 19.050
Carry out the same procedures as
those described under
(ENTER)
Ammeter reading: 20.000
ABORT ENTER
Returning fld dev to original
output appears.
(OK)
Press OK (F4).
ESC OK
4
4 and 5 .
F0231.EPS
IM 01C22T01-01E