Analog Calibration Adjust - Emerson Fisher FIELDVUE DVC6000 Instruction Manual

DVC6000 Digital Valve Controllers
Manual Calibration (1-3-1-2)
It is recommended that you adjust the relay before
manually calibrating travel. For additional information
refer to Relay Adjustment in this section.
Note
Relay Adjustment is only available for
the double-acting relay (Relay A).
Two procedures are available to manually calibrate
5
travel:
D Analog Adjust
D Digital Adjust

Analog Calibration Adjust

Select Calibrate, Travel Calibration, Manual
Calibration and Analog Adjust. Connect a variable
current source to the instrument LOOP + and LOOP −
terminals. The current source should be capable of
generating 4 to 20 mA. Follow the prompts on the
Field Communicator display to calibrate the
instrument's travel in percent.
Note
0% Travel = Valve Closed
100% Travel = Valve Open
1. Adjust the input current until the valve is near
mid-travel. Press OK.
2. If the feedback connection is Rotary - All, SStem -
Roller, go to step 6. If the feedback connection is
SStem - Standard, you are prompted to set the
crossover point. Adjust the current source until the
feedback arm is 90° to the actuator stem, as shown in
figure 5-1. Then press OK.
5-4
Table 5-1. Auto Calibrate Travel Error Messages
Error Message Possible Problem and Remedy
The analog input signal to the instrument
Input current must
must be greater than 3.8 mA. Adjust the
exceed 3.8 mA for
current output from the control system or the
calibration.
current source to provide at least 4.0 mA.
The Instrument Mode must be Out of Service
Place Out Of Service
and the Protection must be None before the
and ensure Calibrate
instrument can be calibrated. For information
Protection is disabled
on changing instrument protection and mode,
before calib.
see the beginning of this section.
The problem may be one or the other of the
following:
1. The tuning set selected is too low and the
valve does not reach an end point in the
allotted time. Press the Hot Key, select
Calibration Aborted.
Stabilize/Optimize then Increase Response
An end point was not
(selects next higher tuning set).
reached.
2. The tuning set selected is too high, valve
operation is unstable and does not stay at an
end point for the allotted time. Press the Hot
Key, select Stabilize/Optimize then Decrease
Response (selects next lower tuning set).
Prior to receiving this message, did the
instrument output go from zero to full supply?
If not, verify instrument supply pressure by
referring to the specifications in the
appropriate actuator instruction manual. If
supply pressure is correct, check instrument
pneumatic components (I/P converter and
Invalid travel value. relay).
Check travel sensor
If the instrument output did go from zero to
and feedback arm
adjustments, and inst full supply prior to receiving this message,
then verify proper mounting by referring to the
supply press. Then,
repeat Auto Calib. appropriate mounting procedure in the
Installation section.
Verify travel sensor adjustment by performing
the appropriate Travel Sensor Adjust
procedure in the Calibration section.
Making the crossover adjustment with the
valve positioned at either end of its travel will
also cause this message to appear.
The instrument may have been taken out of
Aborting due to
service by a primary master. Put the
response code or
instrument into service with the primary
device status.
master or cycle the power off and on.
Note
In steps 3 through 7, the accuracy of
the current source adjustment affects
the position accuracy.
3. Adjust the current source until the valve is at 0%
travel, then press OK.
4. Adjust the current source until the valve is at 100%
travel, then press OK.
5. Adjust the current source until the valve is at 50%
travel, then press OK.
September 2013