Section 4 - Calibration; Introduction; General Calibration; Av3 Calibration - ABB AV3 Instruction Manual

INTRODUCTION

GENERAL CALIBRATION

AV3 Calibration

SECTION 4 - CALIBRATION

This section contains the following information:
General calibration.
•
Gain adjustment.
•
Speed control.
•
Troubleshooting calibration.
•
NOTES:
1. All procedures in this section assume direct-acting opera-
tion.
2. The troubleshooting calibration procedures in this section are
not required for normal operation. The procedure is used only
when operating difficulties occur. The corrective action column of
Table 6-1 will prompt when to use the troubleshooting calibra-
tion.
3. Calibration can also involve cam shaping to achieve the
required control characteristics. Refer to
information about the cam.
A coarse calibration is performed during installation
that normally consists of adjusting the linkage between the posi-
tioner and actuator so that the positioning cam rotates through its
full range for full actuator travel. The general calibration procedure
involves fine adjustments to the zero and span such that the input
signal will cause the desired travel.
Calibration consists of applying four milliamps to set the zero posi-
tion, and applying 20 milliamps to set the span. These adjust-
ments are made with the supply air applied to the positioner.
The Type AV3 positioner has position transmitter options that are
available for feedback purposes. Refer to
information about the position transmitter options.
Appendix C for detailed
(Section
Appendix A for more
INTRODUCTION
4 - 1
3),