Checking during idle time
Once the machine has been shut down, check that:
● The motor foundation has no indentations or cracks.
● The carbon brushes and commutators are in perfect condition. Commutator surfaces have
an even finish.
● The brush holders are correctly aligned and mounted.
● Carbon brushes can move freely in the brush guides, and their pressure fingers can move
freely in the articulated joints. The spring effect is consistent for all carbon brushes.
● There is sufficient brush height remaining to allow fault-free operation until the next
inspection date. The minimum brush height must be observed.
● The motor is aligned within the permissible tolerance range.
● All of the fixing screws for the mechanical and electrical connections are tight.
● The winding insulation resistances are sufficiently high.
● If the bearings are insulated, the insulation has not been bridged.
● Accessible cables and insulating parts are in good condition and are not discolored.
Any defects discovered during checking should be fully corrected.
Note
The inspection measures listed may be required depending on the plant specification and
prevailing operating conditions.
9.1.4 Regreasing rolling-contact bearings
1. Clean the grease nipple.
2. Press in the type and quantity of grease specified on the lubricant plate in portions.
The shaft must rotate so that the new grease is distributed throughout the bearing. The
bearing temperature initially increases noticeably. After the excess grease has been
displaced out of the bearing, the bearing temperature will fall to the normal value again.
3. Remove the outer bearing cover and remove the spent grease.
4. Then remount the bearing cover.
The space for the spent grease is designed for at least ten regreasing sessions.
WARNING
Possibility of the rotor falling out
The rotor can fall out when work is being carried out on the locating bearing and the motor is
vertical. This can result in death, serious injury or material damage.
Support or relieve the rotor of any load when work is being carried out with the machine in a
vertical position.
Maintenance
9.1 Inspection and maintenance
SIMOTICS DC 1GG5
Operating Instructions 02/2016 85
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