Rockwell Automation WebPak 3000 DC Drives Hardware Reference, Installation and Troubleshooting - Manual (Page 59)

C
HAPTER
5
Replacement Parts and Accessories
5 -1
Replacement Parts and Accessories
5.0 Replacement of components
Use original spare parts only.
Selection according to Tables 5.1 to 5.6.
The location of the parts is shown on the layout
label inside the U-frame.
5
6
7
8
4a
4
3
2
1
(1) Screws
(2) Steel plate
(3) Housing
(4a) Flat washer
(4) Plate springs
(5) Stamp
(6) Semiconductor
(7) Centering bolt
(8) Heatsink
Replacement of a thyristor or thyristor
module Type 25 - 800 A
• Loosen and swing out regulator and Interface
assembly
• Remove bus bars above the thyristors
• Remove gate leads of the thyristor concerned
• Unscrew thyristor or thyristor module
• Before mounting the new thyristor or thyristor
module, coat the side, which is in contact with
the heat sink, with a thin layer of heat
conducting paste.
For units 800 A:
NOTE: for safe and easy mounting of thyristors
on 800 A units we recommend the tool
PN 050.00.00
• Insert thyristor into box-clamp and put the
package on the centering bolt on the
heatsink
• Fasten the four hexagon bolts by hand until
all slack is taken out and take care that the
clamp housing stays parallel to the heatsink.
• Tighten each bolt by half a revolution at one
time with hexagonal torque socket spanner 8
mm (10 mm), diagonally.
NOTE: Observe recommended torque!
• Repeat the procedure until the clamp is held
down firmly to the heatsink on each side.
• Re-connect gate leads
• Screw on bus bars.
NOTE: Before replacing a thyristor or thyristor
module the gate and cathode faston
connectors must be checked for
conductivity.