MKS 651D Series, Руководство пользователя, Страница: 76 / 162

Operation Chapter Four: Local Operation
64
4. Press the [L
EARN
] and [Z
ERO
] keys simultaneously for about three seconds.
The 651 controller learns the input voltage that corresponds to the analog set point zero
value, then the screen returns to the default Pressure and Position display screen.
How To Calibrate the Full Scale of the Analog Set Point
The analog set point can be configured for 5 V (initial) or 10 V full scale input (refer to step 9).
You can operate the 651 controller, however, at a different full scale input, for example, 4.5 V,
by recalibrating the full scale of the analog set point. Although the actual voltage input to the
unit must be measured, you can report the voltage input applied as a percentage of the analog set
point full scale, using the analog set point display.
For example, if the analog set point is configured for 5 V full scale input, and the actual input
applied is 5 V, the analog set point display shows a value of 100%. However, if the actual input
applied is 2.5 V, the analog set point display indicates that input by showing a value of 50%.
To recalibrate the full scale of the analog set point:
1. Be sure that the default Pressure and Position display appears on the screen.
2. Apply the full scale input voltage (for example, 4.5 V) to pins 33 and 34 on the Interface
connector. (Pin 34 should be connected to Pin 35 to properly ground the analog input.)
Refer to Table 8, for the Interface connector pinout.
Note
Pin 34 should be connected to Pin 35 to properly ground the analog
input.
3. Press the [ ] and [S
TOP
] keys simultaneously for about three seconds.
The screen displays:
CAUTION
CALIBRATION MODE
4. Press the [S
ETPOINT
D] key.
The screen displays:
ANLG SP: 95.00 %
FULL SPAN: 20015