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TROUBLESHOOTING & REPAIR
SCR REMOVAL AND REPLACEMENT (continued)
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CLAMPING PROCEDURE
FOR
NOTE: This procedure can only be used with
Do not use cap screws with any other type thread or new SCR will be damaged.
Do not over tighten cap screws. The leaf spring will apply the required clamping force to the SCR.
1.Do not turn the nuts. While holding the nuts stationary, turn the cap screws only with the following procedure.
2.Tighten first cap screw 1/4 turn.
3.Tighten second cap screw 1/2 turn.
4.Tighten first cap screw 1/2 turn.
5.Tighten second cap screw 1/2 turn.
6.Tighten first cap screw 1/2 turn.
7.Tighten second cap screw 1/4 turn. STOP.
8.Assembly now has the proper clamping force.
9.Perform the Active SCR Test.
CLAMPING PROCEDURE
FOR
NOTE: This procedure can only be used with
Do not use cap screws with any other type thread or new SCR will be damaged.
Do not over tighten cap screws. The leaf spring will apply the required clamping force to the SCR.
1.Do not turn the nuts. While holding the nuts stationary, turn the cap screws only with the following procedure.
2.Tighten first cap screw 1/4 turn.
3.Tighten second cap screw 1/2 turn.
4.Tighten first cap screw 1/2 turn.
5.Tighten second cap screw 1/4 turn.
6.Tighten first cap screw 1/8 turn.
7.Tighten second cap screw 1/8 turn. STOP.
8.Assembly now has the proper clamping force.
9.Perform the Active SCR Test.
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AFTER REPLACING THE SCRs
Follow the steps in the SCR/Diode Rectifier
Bridge Removal and Replacement procedure
to reassemble the machine.
