SMAR HART FY500, Установка, эксплуатация и обслуживание

Страница: 43 / 64

Section 4 - Local Programming
4.5
Step 3:
After adjusting the position reading gain, the set will be moved to the 0% position again. When
the set has stopped at position 0%, the user must place the magnetic tool in (S).
Step 4:
Adjusts the other end of valve travel. No user action required.
NOTES
• The MANUAL SETUP is recommended in cases where it is not possible to execute the
AUTO SETUP procedure due to very unstable environment.
• The display will show messages informing the user of the need for intervention in steps 1,
2 and 3. If the user does not complete the action, the positioner will continue in the current
step.
TRIM 4mA (Trim 4mA)
To calibrate the analog input signal, connect a variable current source (4 to 20 mA) to the positioner
(+) and (-) terminals. To the follow steps the accuracy of the current source adjustment affects the
position accuracy.
1. Adjust the current source to 4 mA (0%)
2. Place the magnetic tool in S to confirm. After DONE appears on the display, the trim will be
done.
TRIM 20mA (Trim 20mA)
To calibrate the analog input signal, connect a variable current source (4 to 20 mA) to the positioner
(+) and (-) terminals. To the follow steps the accuracy of the current source adjustment affects the
position accuracy.
1. Adjust the current source to 20 mA (100%).
2. Place the magnetic tool in S to confirm. After DONE appears on the display, the trim will be
done.
DISPLAY (Disp)
It configures which variable will be shown on the display during the normal operation of the
equipment. The options are SP% (SP) , PV% (POS) , and MV% (I-P) .
ACTION (Act)
Direct acting
(di)
- output increases with increasing input signal.
Reverse acting (rE) - output decreases with increasing input signal.
CHARACTERIZATION - Characterization Curves (Char)
Select desired valve characteristic curve. The custom curve must have been entered through HART
Interface.
- Linear : linear (Lin)
- (EP25), (EP33), (EP50) : equal percentage
- (Hy25), (Hy33), (Hy50) : hyperbolic (quick opening)
- (tAb) : table of 16 points (configurable)
MODE (Mode)
Determines the input mode of the setpoint. There are two modes:
- AUTOMATIC MODE (Auto)
The setpoint is determined by the input current.
- MANUAL MODE (man)
The setpoint is determined by the user.
SP % - SET POINT (SP)
This parameter represents the desired position value. In the “Manual” mode, this parameter may be
changed by user, independently from the input current.
WARNING
• When turning the positioner off and on again, it automatically returns to AUTO
(Auto Mode).
• When the positioner goes from automatic to manual mode, it keeps the last
setpoint value.
• Be careful when the positioner switches from manual to automatic mode, as if
the last user-defined setpoint value is too different from the input current, the
valve will move abruptly.