ABB Tmax T8 L5757 - Mechanical Operating Mechanism Maintenance; Electrical and Mechanical Accessories Maintenance

L3692
Tmax T8
14/39
Doc N°
Mod.
Apparatus
Scale
Page N°
1SDH000682R0002
L3885
L5757
- If the undervoltage release is installed, disassemble the coil support and unload the springs of the operating mechanism by
closing and opening the circuit-breaker.
Fig. 20
8.3.5. Mechanical operating mechanism
- Clean the points indicated in fi gure 21. Use a cleaning product such as Henkel’s 273471 or equivalent if there is a heavy coat-
ing of dirt.
- Lubricate the opening and closing latches and the shafts in the points indicated in fi gure 21 with MOBILGREASE 28 (EXXON
MOBIL).
- Make sure that the opening and closing shafts are free to turn.
Fig. 21
8.3.6. Electrical and mechanical accessories
- Make sure that the accessories are securely fi xed to the circuit-breaker.
- Make sure that the electrical accessories are correctly connected to the circuit-breaker.
- Gearmotor: after every 10000 operations, check the brushes for wear and replace the gearmotor if necessary.
- Make sure that the releases (SOR-UVR-SRC) are in good conditions (absence of excessive wear, overheating, breakages) Fig. 22.
- Make sure that the mechanical operation counter functions correctly (if applicable) by operating the circuit-breaker.
2Nm
Fig. 22