Replacing A Diode Stack; Discharging The Snubber Circuit Capacitor; Replacing Water Sensors - Siemens SINAMICS SH150 Operating Instructions & Installation Instructions

9.7.8

Replacing a diode stack

9.7.8.1

Discharging the snubber circuit capacitor

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
9.7.9

Replacing water sensors

The sensors for detecting temperature, conductivity, and decreases in pressure are installed in
the water piping.
NOTICE
Device damage due to water
If water enters the cabinet while a water sensor is being replaced, this can result in material
damage.
● Before replacing a water sensor, empty the entire water circuit and blow out the piping.
● Before screwing into the adapter element, seal the outer thread using LOCTITE 586-
SINAMICS SH150 6SL3805
Operating Instructions 05/2020
WARNING
before you withdraw the diode stack.
AVX(ROHRD)RT sealant. The Siemens order number for the sealant is 534032.
Maintenance
9.7 Repair
111