Transcript
Digital Meter KIT No: 0349 307 620
Pos.
Qty.
Part no
1
Circuit board
Designation
1
0349 495 934
Notes
2
Cable set
1
0349 302 847
3
Control transformer
1
0455 844 001
4.5VA
4
Shunt
1
0456 027 880
60mV / 400A
5
Capacitor
1
0349 303 027
6
Screw
1
0349481 198
M8 x 20
7
Nut
1
0349481 148
M8
8
Screw
2
0349481 166
M4 x 10
9
Screw
2
0349481 324
M3 x 10
10
Nut
2
0349 481 392
M4
11
Nut
2
0349481 391
M3
12
Washer
2
0349 481 442
ø4,3
13
Washer
1
0349 481 038
ø 8,4
14
Spring washer
1
0349 481 052
ø 8,1
15
Washer AL-CU (Migmaster 253 only)
1
0349 484 770
ø 8,4
Assembly instr
1
702-0-0-00-04-00-0-4
Migmaster 173,203,253
Meter Calibration Procedure This meter kit has the capability of voltage and current calibration, as well as current-dependant voltage offset. The “Off-set” calibration corrects the displayed voltage to the approximate arc voltage at the weld gun contact tip even though the meter voltage pick-up is at the power source output studs. Since all meters are factory calibrated, it is not recommended to use the off-set calibration method unless the actual arc voltage at the weld pool is required. Most welding applications do not require this method of calibration. Standard Calibration Mode For standard calibration, an accurate reference voltmeter, ammeter and a resistance load are required. The resistance load should be set for at least 100A current flow. The voltage reference meter should be connected to the same potentials (locations) as the calibrated factory supplied meter or across the output studs. In most cases the resistive load has a calibrated set of meters (volts & amps) and can be used for this calibration method. Calibration Procedure 1) Switch the machine “On” and load it to at least 100 amps. The meter should indicate voltage and current is present. 2) While a load is applied to the machine, simultaneously, press and hold for 3seconds both push buttons (S1 & S2) on the meter PC board. Symbols of the calibration modes appear in sequence: Release the buttons as the required mode appears. a) “U” - voltage calibration b) “I” - current calibration c) “dU” - voltage off-set. 3) Adjust the voltage or the current value equal to the value shown by the reference meter by means of the push buttons: a) S1 - “+” to increase the displayed value. b) S2 - “-” to decrease the displayed value. Voltage Off-Set Mode The reference voltmeter should be connected to the end of work lead and to the torch contact tip (or as close to the contact tip as possible), which are also connected to the external resistive load. In this mode, as well as during regular welding, the meter shows a voltage that includes the voltage drop on the welding cables and welding gun. An off-set adjustment of the voltage should be carried out at load currents above 100A and at arc voltages that are representative of a good welding condition. Use the method in step 3 above to set the voltage to the desired off-set reference. Note Voltage off-set should be carried out using calibrated voltage and current instrumentation and is only valid using the installed work lead and gun cable length and size..
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