Arc Machines 207 - Manual (Page 61)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION VII - CALIBRATION
7.2 CURRENT CALIBRATION
The M-207A contains components for measuring the actual amount of current.
Normal calibration is intended for adjusting the circuitry based on measuring
these devices.
True verification of current output for Quality Control purposes must be done
with an External Calibration Shunt that is calibrated by an independent agency
and controlled by a users QC or QA department. An external shunt adequate for
this use is sold as a M-207A option.
This procedure is written to include both calibration using the internal devices for
measuring and for using the external shunt option provided by AMI.
A weld schedule is required for calibration. The first time calibration is done it
will have to be CREATED. Step 1 below has a place for writing in the Weld #
when it is created.
1. Select Weld Schedule Number _______ and verify that it is programmed as
follows:
PRE-PURGE-POST UP-SLOPE-DOWN ROT--DLY
30 30 1.0 1.0 CW 0.0
LVL PULSE ROT PRI--RPM--BCK
1 OFF OFF 0.00 0.00
LEVEL 1
LVL TIME PRE-AMP-BCK PRI-PULSE-BCK
1 10 100 0 0.00 0.00
LVL PULSE ROT PRI--RPM--BCK
2 OFF OFF 0.00 0.00
LEVEL 2
LVL TIME PRE-AMP-BCK PRI-PULSE-BCK
2 15 10 0 0.00 0.00
The system is calibrated at 100 amps in level 1 and at 10 amps in level 2. To
give yourself enough time to check each value it is suggested that you make at
least 4 levels as above making all odd number levels 100 amp and all even
levels 10 amps.
7.2