Oper ating Instr u ctions CM Synchronous Ser v omotors 31 8 Inspection and Maintenance 8 I nspection and Maintenance U se only genuine spare parts in ac cordance with the valid parts list M otors can become very hot duri ng operation danger of burns D isconnect the motor and brake from the power supply before starting work safeguarding them agains t unintentional powerup M aintenance work on the BR brake ma y only be performed by SEWEURODRIVE since the encoder must be readjusted after every disassembly 81 I nspection intervals The periods of wear are affected by m any factors and may be short The machine designer must calculate the r equired inspection intervals individually in accordance with the project planning documents eg Drive Engineering Practical Implementation Drive Project Planning Geared Servomotors catalog 82 B R brake inspection work Measuring the working air gap The working air gap H following figure can be measured using the stroke of the pressure plate via the studs during the release permitted range 01508 mm 50940AXX H