Current Transducer Test - Lincoln Electric POWER WAVE C300 Service Manual

F-72
CURRENT TRANSDUCER TEST PROCEDURE (continued)
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. To gain access to the Current Transducer first
perform the Case Cover and DC Link
Capacitor Discharge Procedure.
3. Locate plug J8 on the Control Board. See
Figure F.25. To gain access to the Control
Board see the Control Board Removal and
Replacement Procedure.
4. Locate the Current Transducer. See Figure
F.26.
5. Carefully apply the correct input power to the
POWER WAVE® C300.
6. Check for the correct DC supply voltage to the
current transducer. See Figure F.25 for Plug
J8.
A. Pin 2 (lead 212+) to Pin 6 (lead 214-)
should read +15VDC.
B. Pin 3 (lead 213-) to pin 6 (lead 214+)
should read -15VDC.
Note: Do not attempt to check the voltages at the
current transducer connector. The termi-
nals are small and delicate and may be
damaged if probed with meter leads.
If the DC supply voltages are not present
the Control Board may be faulty. If the sup-
ply voltages are correct, proceed to Step 7.
For Steps 7 through 13 refer to the information
in the Power Wave Manager software found at
Powerwavesoftware.com
7. Using the Ethernet Cross Connect cable, con-
nect a laptop computer to the POWER WAVE®
C300 via the Ethernet port located at the top
rear of the machine. See Figure F.27.
TROUBLESHOOTING AND REPAIR
POWER WAVE® C300
8. Connect a load bank (or 50 Ft. weld cable) to
the Positive and Negative output terminals on
the POWER WAVE® C 300.
9. Using the Power Wave Manager software:
a. Establish Communication with the PW
C300
b. Select the "Calibrate" tab
c. Select the "50 amp" current set point
d. Select "Turn Output On"
e. Use an external calibrated ammeter that is
not affected by inverter noise to read the
actual current.
10. Check the current transducer's feedback volt-
age at the Control Board plug J8 per Table
F.14. Pin 1 (lead 211+) to pin 6 (lead 214-).
See Figure F.25. for pin locations.
11. Repeat the test at several other current levels.
If the transducer feedback voltage is correct for
the actual current, the current transducer is
functioning properly. If there is no feedback
voltage, check the wiring from the control
board to the current transducer. See the wiring
diagram.
CAUTION: If using a weld cable across the output
terminals instead of a load bank, do
not exceed the current rating of the
cable.
12. If the supply voltages are correct but the cur-
rent transducer feedback voltages are incor-
rect the current transducer or wiring from the
current transducer to the control board may be
defective. See the wiring diagram.
13. Click on "Turn Output Off"
14. Disconnect the laptop computer.
15. Remove the input power to the PW C300
machine.
16. Replace the Control Board and the case
covers.
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