Transmig 210, 250, 310, 330
DOC No: MIGTRN0001 Page 25 of 31
Issue No: 2 Date: 14/09/98
9.1 Improved Current Accuracy Calibration Procedure for the Digital Meter
CAUTION 9: This calibration procedure should be carried out by a qualified electrical
tradesperson.
The following procedure will give a current measurement accuracy of better than the factory
standard of approximately 5%.
a) Equipment Required:
Transmig
210
Transmig
250
Transmig
310
Transmig
330
DC Ammeter
(certified up to ±1%
accuracy)
250A 300A 400A 400A
LOAD RESISTANCE of
0.1
W
5kW 8kW 12kW 12kW
Output Connecting Leads
4 4 4 4
b) Procedure:
i) With the Transmig switched off, connect the LOAD RESISTANCE and DC
AMMETER to the output terminals.
ii) Open the wirefeeder compartment door or remove the lefthand side cover (when
viewing the Transmig from the front) from the Power Source.
iii) Select maximum voltage switch positions Coarse 4 Fine 4 (MIG 210/250)
Coarse 4 Fine 6 (MIG 310/330)
iv) Switch the Mains supply voltage to the Transmig ON.
v) Ensure the DIGITAL METER is selected to read current.
vi) Short circuit the TORCH TRIGGER terminals to energise output welding terminals.
CAUTION 10: Do not allow the Transmig to remain ON under load for more than ONE
minute!
vii) Determine the output current as given by the DC AMMETER.
viii) Adjust SHUNT CAL. potentiometer on DIGITAL METER to read identically with
DC AMMETER.
ix) Open circuit the TORCH TRIGGER terminals to deactivate output welding
terminals.
x) Select minimum voltage switch positions Coarse 1 Fine 1
xi) Short circuit the TORCH TRIGGER terminals to energise output welding terminals.
Refer to CAUTION 10.
xii) Determine output current as given by the DC AMMETER.
xiii) Confirm the minimum DIGITAL METER reading is within ±2% of DC AMMETER.
xiv) If the above is not met, offset the SHUNT CAL. potentiometer such that both the
minimum and maximum values are within ±2%.
xv) The improved accuracy for DIGITAL METER is now complete.
xvi) Where fitted, position the meter cover over the hexagonal brass spacers taking care
not to trap loom wiring.
xvii) Fit the M3 flat washers and M3x10 screws through the meter cover and into the
hexagonal brass spacers.
