Maintenance Operating Mechanism Maintenance
16 1HSB515409-100 en rev2
4.7 Drive unit
• Check and clean the shafts in the catch gear and the worm gears in the drive
unit.
• Lubricate these with Grease “M” at intervals of 3-6 years or 2,000 operations.
• Measure the motor current at the end of the spring charging procedure at
intervals of 15 years or 5,000 operations. See the relevant Assembly
Instructions for the circuit-breaker, chapter Operating values.
The motor should be capable of charging the springs at 85% of its nominal voltage
(IEC).
Figure 4-7. Drive unit
4.7.1 Switch Hand-Motor
Check that the signal for voltage failure functions. If not, replace the switch.
Item
1Drive unit
1
B20011
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