ESAB LAW 400, Руководство по обслуживанию

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FITTING INSTRUCTIONS, THERMAL OVERLOAD CUTOUT
These instructions apply only to machines with serial numbers 434 . . . . . . .
1. Remove all dirt from contact surface of the cooling fins where they contact the thermal
overload cutout ST1.
2. Apply a thin layer of thermal paste to the contact surfaces. See item 418 on page 50 for
the order number of this paste.
3. Fit and tighten the thermal overload cutout to a torque of 1.5 Nm
¦
0.5 Nm.
FITTING INSTRUCTIONS, THYRISTOR MODULES
These instructions do not apply to LAW 400/410 with serial numbers 512 . . . and above,
instructions for those machines are on next page.
1. Remove all dirt from the contact surfaces of the cooling fins where they contact the
thyristor module.
2. Apply a thin layer of thermal paste to the contact surfaces. See item 418 on page 50 for
the order number of this paste.
3. Fit the screws and washers as shown in the diagram below, and tighten the screws to a
torque of 2 Nm.
4. Make a second pass and tighten all the screws to a torque of 5 Nm.
5. Connect the wires from the circuit board as shown in the diagram below:
Y = yellow, R = red. Note the markings, 4 -- 7, on the thyristor module.
6. Warm up the units by running the LAW 400/410 at 280 A and the LAW 500/510 at
380 A for ten minutes.
7. Retighten the screws to 5 Nm
¦
0.7 Nm.
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1. Screw, M6 x 16
2. Spring washer, Ø 12.5/6.2 x 0.7 mm
3. Washer, Ø 12/6.4 x 1.5 mm