92
7.3.3.2 Checking functionality of the interlocks
• Carry out a visual inspection of the mechanical parts of the interlocks (key locks 22, door interlocks
23, fail safe 24) and check for any presence of humidity and signs of corrosion on the moving parts.
• Remove any deposits of dust using a dry cloth that does not leave any deposits on the treated
surfaces (do not use woollen cloths).
• Check that the moving parts can slide evenly. If necessary, grease the mechanical moving parts by
applying a thin layer of mechanical grease for moving parts.
7.3.4 Maintenance in the low voltage compartment
7.3.4.1 Checking of correct operation of the protection release
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
• Rack the circuit-breaker out from the service position to the test/isolated position;
• Manually close the earthing switch;
• Withdraw the protection release from the fixed part fixed onto the door of the low voltage
compartment;
• Using current and volumetric test boxes, carry out injections to check perfect operation of the
protections themselves.
Note
To check operation of the protection releases, refer to the operating manual of the protection provided
by the manufacturer.
7.3.4.2 Cleaning and checking the auxiliary connections
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
• Rack the circuit-breaker out from the service position to the test/isolated position;
• Manually close the earthing switch;
• Open the miniature circuit-breakers 25 (figure 146) positioned inside the low voltage compartment
to remove the auxiliary power supply to the panel;
• Carry out a visual inspection on all the cabling, terminal boxes 26 and check for any presence of dirt;
• Manually check correct insertion of the cabling in the terminal box.
Figure 146
Figure 144 Figure 145
25
26
25
22
24
23
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