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COMPONENT DESCRIPTION, LHN 130/140/200
This component description relates to the wiring diagrams on pages 7 -- 11.
The LHN 130/140/200 rectifier power units are primary switched type, using parallel--
connected MOSFET transistors as switching devices. Switching frequency is 36 kHz.
The conduction interval ranges between zero and 11 µs, depending on the welding current
being supplied. The conduction time and frequency are controlled by circuit board AP01.
AP01 Main circuit board with control electronics. See the description on page 14.
AP02 Circuit board with power transistors for the positive pole:see description on
page 20.
WARNING: these transistors are at mains voltage.
AP03 Circuit board with power transistors for the negative pole:see description
on page 22.
WARNING: these transistors are at mains voltage.
AP04 Suppression circuit board and protection against transient voltages:
protects the secondary diodes against transient voltages.
Replaced by capacitors C06 from serial number 628--xxx--xxxx.
See “transient protection, rectifer unit V03, V04” on page 6.
AP05 Suppression circuit board, EMC. Protects from mains borne interference
to/from the machine. Mounted from serial no. 540--xxx--xxxx.
LHN 200: The ferrite ring cores L06 and L07 are included in AP05.
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e21
Circuit diagram and component positions circuit board AP05
C01 Capacitor, 0.1 µF, 1000 VDC, transient protection.
C02 Capacitor, 1000 µF, buffer/smoothing capacitor. This capacitor takes about
two minutes to discharge after disconnecting the equipment from mains.
C03 See C02. Not mounted in LHN 130/140.
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