48
CLEAr
. Press the FUNC key to restore the linear factory calibration of the span value. When the
legend
DSP.FL
appears in the lower display, calibration is complete. Press A/M to return to the
operating screen.
7.2 START-UP AND ENGAGING SMART
After Calibration of the Transducer to the Instrument, return to the main display. Press the FUNC key
until
0
shows in the upper display, and
SP
shows on the lower display. This is the pressure setpoint.
7.2.1 SETTING THE PROCESS SET POINT
Press the ▲ key until the process setpoint pressure shows on the upper display. Ensure that the
process is at operating temperature. Turn on the motor drive, and press the ▲ key to increase the
Output % until the drive system engages and begins running. Press the ▲ key to slowly approach
the set point pressure until the pressure stabilizes around the set point pressure.
7.2.2 ENGAGING SMART
Press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
2
shows in
the upper display. Press the FUNC key and the lower display changes to
ZERO.C
. Press the FUNC
key until
SMART
shows on the lower display and
OFF
shows on the upper display. Press the ▲ key
to turn the upper display to
ON
, and enter with the FUNC key.
NOTE: Under NO circumstances should the SMART be engaged with the motor drive shut off. The
PID or PI loops will “wind up” until they are at the maximum value, and if the drive is
started in this condition, the drive will start at 100% speed. Damage to the drive and
peripheral equipment will result.
The SMART LED will flash and a countdown will begin as the controller determines its initial P and I
values. Return to the main screen and observe that the value in the upper display is the actual value
you wish to control.
7.2.3 ENGAGING AUTOMATIC CONTROL
When the Smart LED has stopped flashing, press and hold the A/M key until the lighted legend
MAN
goes out. The ATC770 is now in the Control Mode.
7.3 THE TUNING MODE
When the SMART Tuning Algorithm is active, a series of computations takes place to calculate the
PID parameters. There are two tuning modes: The Tuning Algorithm and the Adaptive Tuning
Algorithm. Each works on a different concept that will be explained in their related sections.
To Next Page
Loading...
Need help?
General
