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91
51. Changing the carbon brushes on motor types UUS 390 and UUS 393
Removal:
z Remove the motor in accordance with point 49of this manual.
z Slightly raise the two locking tabs 163 and remove cover 162 (fig. 115).
z Unscrew the two groove nuts 170.
z Pull the motor apart and remove end shield 171.
z Detach the torsion springs and remove carbon brushes 169.
z Clean the collector and the motor.
Refitting:
z Insert the two new carbon brushes and re-attach the torsion springs.
z Refit end shield 171.
z Insert the two groove nuts 170 and firmly tighten.
z Insert cover 162 onto one side and allow it to engage on the other.
z Measure the simulated leakage current in accordance with section 58 of this manual.
z Fit the motor in accordance with section 49.
z Carry out an electrical safety test in accordance with VDE 0701 using testing appliance ABB Metrawatt
M 5013.