Lincoln Electric 10372 Service Manual page 138

F-74
POWER W VE 455 / PF-10 METER CCUR CY CHECK
Service and repair should only be performed by Lincoln Electric factory trained
personnel. Unauthorized repairs performed on this equipment may result in dan-
ger to the technician or machine operator and will invalidate your factory war-
ranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to per-
form the test/repairs safely, contact the Lincoln Electric service department for
technical troubleshooting assistance before you proceed. Call 216-383-2531 or
1-888-935-3877.
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DESCRIPTION
This procedure will aid the technician in checking and calibrating meter displays.
M TERI L NEEDED
DC ammeter and meter grade shunt, +/- 1% accuracy
DC voltmeter, +/- 1% accuracy
Resistive load bank
DSP, STT or other PF-10 option panel with mode light and set switch
PW-455 and PF-10 Operator's manual for reference
METER CCUR CY CHECK
1. With power off, locate DIP switch bank
S2 on the PF-10 Control PC board.
(There are 8 switches, number 1 on the
left, through number 8).
2. Set switch 8 to the up position.
3. Connect a resistive load between the
output block of the PF-10 and the work
terminal of the PW-455 machine.
4. Turn machine on.
5. Using the Set Control on the PF-10, set
the display to mode 200. Turn the right
knob of the PF-10 to energize the output.
6. Adjust the resistive load and the left knob
of the PF-10 to achieve 300A at 32v. The
left knob will adjust the output current.
Amps and volts will be displayed on the
PF-10 meters.
7. After the load condition is set, accuracy
is measured by comparing the meter of
the PF-10 to the master meter. At 300A,
amperage must agree within +/-10A. At
32V, voltage must agree within +/- 1V.
TROUBLESHOOTING ND REP IR
W RNING
This procedure takes approximately 30 minutes to perform.
POWER W VE 455/POWER FEED 10
8. At conclusion of test, turn the power off
and set the DIP switch to its original
position.
PROCEDURE TO REP IR IF
METERS RE OUT OF R NGE
If the measured voltage is not within the
acceptable range, the Control PC board
must be replaced. The Control PC board
can not be calibrated.
If the measured current is not within the
acceptable current range, adjust trimmer
R126 on the Control PC board. R126 is
located on the upper left corner of the
Control PC board. If the display is still in
error, either the Control PC board or LEM
(Current Transducer) may be faulty.
Perform the Current Transducer Test.
F-74