Low Voltage Test; Main Components Installation; Main Circuit Card Z001; Secondary Rectifier Card Z003 - Kemppi FASTMIG X 450 Service Manual

4. LOW VOLTAGE TEST

Low voltage test gives basic information where machine has fault. Machine can switch on from auxiliary transformer
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secondary winding to control blocks and via primary winding to DC link
After replacing components it's recommended to start machine with low voltage test
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Measuring:
Input 20VAC (Kemppi Multipower) to aux. transformers connector X2 pins 1-2 or 2-3
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o voltage goes thought secondary winding to primary side as 400VAC
o voltage goes also to another secondary coil as 38VAC
o machine starts up and DC link voltage can be measured Z002 X1 and X3

5. MAIN COMPONENTS INSTALLATION

Heat sink paste should be spread on to the modules in an even layer by using clean fingers. Then the card should be
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immediately mounted onto the heat sink, this minimizes the possibility of any contamination (dirt etc.) getting
between the components.
Use torque screwdriver when tightening any power components onto the heat sink. See following sections for
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tightening torques.

5.1. Main circuit card Z001

Primary rectifier to heat sink 2 NM
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IGBT unit to heat sink
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o First step 2 NM and wait a couple minutes
o Second step 3 NM

5.2. Secondary rectifier card Z003

Secondary diodes to heat sink 1,2 NM
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Resistors to heat sink 0,7 NM
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5.2. Cut off card Z004

Mosfet to heat sink 1,2 NM
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Kemppi OY
SERVICE MANUAL
FASTMIG X
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