9.7.8 Replacing a diode stack
9.7.8.1 Discharging the snubber circuit capacitor
WARNING
Danger to life due to electric shock at the snubber circuit capacitors
The snubber circuit capacitors are not always equipped with discharge resistors. The energy
stored in the capacitors is discharged via a diode. Voltages of up to several 1000 V can occur
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 withdraw the diode stack.
Tool required
● Socket wrench set
● Set of open-ended wrenches
● Torque wrench up to 50 Nm
● Ratchet with short extension
● Ratchet length extension
● Side cutters
● Short slotted screwdriver, Size 2
● Screwdriver, Torx T30
● Cable ties
● Touch-up pen, e.g., Edding 751.
Maintenance
9.7 Repair
SINAMICS PERFECT HARMONY GH150 6SL3825
Operating Instructions 05/2020 115
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