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Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
Chapter 3
Access Procedures
2.
Remove the gate leads that connect the SCR modules to the pulse
transformer circuit board from the pulse transformer circuit board end.
3.
Remove the four screws that secure each SCR module to the heatsink and
remove the SCR modules. Note the order of the washers on the bolt.
Install the SCR Modules
Install the SCR modules in reverse order of removal.
•
Verify that each gate lead from the SCR modules is connected to the
proper connector on the pulse transformer board.
•
Apply thermal grease to the bottom of the SCR modules before securing
them to the heatsink.
•
Use the following table to determine the proper tightening torque for the
SCR modules installed on the heatsink:
•
Use the following table to determine the proper tightening torque for the
bus bars connected to the SCR modules:
ATTENTION:
Thermal grease must be applied to the bottom of the SCR modules
before securing them to the heatsink or damage to the drive may occur.
230V AC Input
460V AC Input
Part Number
Final Torque
Part Number
Final Torque
SK-20P-S727F
4.5…5.5 N
•
m (40…48.7 lb
•
in)
SK-20P-S737F
4.5…5.5 N
•
m (40…48.7 lb
•
in)
SK-20P-S770F
6 Nm (53 lb
•
in)
SK-20P-S771F
6 N
•
m (53 lb
•
in)
230V AC Input
460V AC Input
Part Number
Final Torque
Part Number
Final Torque
SK-20P-S727F
11…13 N
•
m (97.4…115 lb
•
in)
SK-20P-S737F
11…13 N
•
m (97.4…115 lb
•
in)
SK-20P-S770F
11…13 N
•
m (97.4…115 lb
•
in)
SK-20P-S771F
11…13 N
•
m (97.4…115 lb
•
in)
Remove four screws