Maintenance
9
9.1
Safety instructions for maintenance
When carrying out any work, carefully observe the information provided in Chapter "Safety
instructions (Page 15)".
Electric shock when touching the snubber circuit capacitors
The snubber circuit capacitors are not equipped with discharge resistors. The energy stored in
the capacitors is discharged via a snubber resistor and the diodes. If the connection to the
capacitor is interrupted, high voltages up to several 1000 V can result and cause an electric
shock. This can result in death, severe injuries and significant material damage.
● You should always handle the capacitors as if they are charged. Discharge the snubber
circuit capacitors. Short-circuit the snubber circuit capacitors briefly before you begin work
on the drive.
Danger due to improper maintenance and repairs
Improper repairs can result in death and serious physical injury.
● Only qualified maintenance and installation personnel may perform repairs.
Danger due to defective seals
When working on the device, seals at the doors, roof panels as well as front, rear and side
panels can be damaged. Operation with defective seals can result in death, serious injury or
material damage.
● Replace the defective seals before commissioning. Observe the environmental conditions
stated in the technical data.
Electric shock caused by externally connected high voltages
Magnetizing and demagnetizing equipment that is fed from an external voltage source can
result in high voltages. This voltage can result in death or serious injury.
● Ensure that no voltage from external feeds exists before commencing maintenance and
repair work.
SINAMICS SM150 6SL3810-7NN38-0AA1
Operating Instructions Rev.201910281406 EXAMPLE
141
