AW Gear Meters EMO-3000 - Manual (Page 41)

EMO‐3000
Operation and Programming Manual
40
Tolerance for PID A
Tolerance is the allowed deviation of the set value. The deviation is given in a +/‐ format. For example, if
the tolerance is 3 cc/min and the set value is 200 cc/min, then between 197 and 203 cc/min, the PID
algorithm is not effective and no corrections are performed.
USED IN: PID mode.
RELATED VARIABLES: KFR A
HEX ADDRESS: 00A9 HEX ‐‐‐‐> NEW VARIABLE
BYTES: 2 Bytes DEFAULT: 3 cc/m
ASC form COMMAND: reading = 112; writing = 512; E returns the value in engineering
units. N returns Hz value. By adding /XXcr, where XX is color
number (example: #01E112/12cr), the tolerance for the color 12
is returned. Omitting /XX returns 0.
Gain factor for PID A_KP (P‐part)
Gain factor influences the closed loop action speed and impacts how strongly the unit tries to enter the
set‐value. Commonly used values are 1 to 1500. The value is often determined by the system’s ability to
respond. The formula to describe the actions of the gain factor is:
ANALOG OUT = ANALOG OUT old + (set‐value‐current‐value) x GAIN
The algorithm is only applied when a pulse is completed (new information available). This feature makes
the unit adapt to slow frequencies at a slower pace. In general, the A_KP is a experimental value and
changes from application to application.
USED IN: PID mode.
RELATED VARIABLES: A_KD/A_KI
HEX ADDRESS: 008D HEX ‐‐‐‐> NEW LOCATION FOR THIS VARIABLE
BYTES: 2 Bytes DEFAULT: 350
ASC form COMMAND: ASC form COMMAND: reading = 113; writing = 513; E and N both
have the same effect value. By adding /XXcr, where XX is color
number (example: #01E113/12cr), the Gain factor for the color
12 is returned. Omitting /XX returns 0.