General - Marconi LORAIN RHM800E50 Manual

CONTENTS

1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. REQUIRED TOOLSAND MATERMS . . . . . . . . .
3. INSTALLATION PROCEDURE _ . . . . . . . . _ . . . . .
APPENDIX
1. GENERAL
These instructions provide a step-by-step
procedure for replacement of disc-type thyristors or
diodes. These semiconductors are used in various type
these instructions should be followed to correctly
replace disc-type thyristors or diodes.
1.02 Refer to Figure 1 for identification outlines of
the disc-type thyristor and diode. The replacement
device should be compared to the outline drawing prior
to replacement. Identify the polarity and type of the
replacement semiconductor to insure that the new
diode or thyristor is correctly installed in its heatsink.
1.03
Figure 2 provides an illustration showing force
gauge use during the replacement procedure. Refer to
Figures 2A through 2C during installation to insure that
correct mountin.g force is exerted on the replacement
diode or thyristor.
2. REQUIRED TOOLS AND MATERM.
2.01 The following tools and materials are required
to replace a 'disc-type' semiconductor:
REPLACEMENT OF DISC-TYPE THYRISTORS
AND DIODES USING CLAMP ASSEMBLY
2868-23443 OR 286823500
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3. INSTALfAllON PROCEDURE
3.01
requiring repair. Open all AC and/or DC input and
output circuit breakers or switches according to the
Stopping Procedure in the appropriate instruction
manual. Open the external disconnect on protective
device prior to the replacement procedure.
Refer to the Schematic Diagram of the
equipment
equipment
sources. In some instances, it may
to remove input, Output. and control fuses to
completely isoldte the equipment
source.
cabinet.9 of some LORAIN equipmead after inpdt
a n d o u t p u t p o w e r eourcee h a v e
assembly reqtdriq repair.
Issue Dl, December 7,199O
and extension; 3/8 or 1 I2 inch drive
Screwdriver; medium sized flat blade
1 (Force oauoe: L.P. Part No. 6774407-001
Thermal joint compound; Wakefield
Engineering, Inc., Type 120 (L.P Part
No. 1762-51000). or equivalent.
Remove all sources of power to the equipment
repaired.
being
is completely isolated from all power
DANGER
Section 2968
Insure that the
be necesory
from any power
b e e n
made with
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