Troubleshooting & repair, Wire speed accuracy test – Lincoln Electric NA-5S User Manual
Page 116
F-63
TROUBLESHOOTING & REPAIR
F-63
3. Check for the proper drive roll revo-
lutions per minute. (RPM)
A. Adjust the STRIKE speed con-
trol to obtain the SET speed
specified for the speedmeter
calibration pin and head ratio
specified per Table F.5 While
pressing the INCH down button
count the drive roll revolutions in
60 seconds. The drive roll revo-
lutions and actual speed reading
should match Table F.5
B. If the readings do not match the
number in Table F.5 refer to the
Meter Circuit Accuracy Test.
WIRE SPEED ACCURACY TEST
(Continued)
NA-5
SPEEDMETER
HEAD
SET SPEEDMETER
DRIVE ROLL
ACTUAL
CALIBRATION
RATIO
READING (IPM)
RPM
SPEEDMETER
PIN
READING (IPM)
21*
21/1
0.27 (IPM X 1000)
50 +/- 2
0.27 +/- 0.01
(IPM X 1000)
57F**
57/1
268
50 +/- 1
268 +/- 2
57**
57/1
262
50 +/- 1
262 +/- 2
95
95/1
249
50 +/- 1
249 +/- 2
95S***
95/1
265
50 +/- 1
265 +/- 2
142
142/1
250
50 +/- 1
250 +/- 2
142T***
142/1
260
50 +/- 1
260 +/- 2
TABLE F.5
* Present on HI -Speed NA-5 speedmeter board only. ** Early speedmeter pins were labeled 55F and 55,
respectively.
*** Early speedmeter PC boards did not include these calibration pins.