ESAB LAW 400, Service Manual

Page: 34 / 66

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FITTING INSTRUCTIONS, THYRISTOR MODULES, LAW 400/410
These instructions apply only to machines with serial numbers 512 . . . . . . . and above.
The machines are originally delivered with thyristor modules according to the descriptions
below.
When ordering a thyristor module as a spare part, thyristor module Semikron SKMT 91/04D,
with the part number 0456 536 001, is delivered. From the end of 1997 the LAW 410 will be
equipped with Semikron SKMT 92/04D thyristor modules, these modules will then also be
delivered as spare parts (the same part number as above).
Fit the thyristor modules in accordance with items 1--7 on the previous page, noting the
following differences:
S
The screws for the anode and cathode connections (item 4 below) are of a different size
from the screws for item 1. The washers and spring washers are also differntly sized.
THYRISTOR MODULE 0455 156 001 (Eupec)
From machine number 512 . . . . . . . to machine number 550 644 . . . .
The cathode busbar (shunt RS1) is connected differently to the arrangement shown in the
other pictures.
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Z1, Z2
RS1
V1, V2
V3, V4 V5, V6
1
A
4
1. Screw, M6 x 16
4. Screw, M5 x 16
Washer, Ø 10/5.6 x 1 mm
Spring washer, Ø 10/5.2 x 0.5 mm