11.98
Start-up
Siemens AG 6SE7087-6AC85-0AA0
ENGLISH
4-1
Common Rectifier Operating instructions
4
Start-up
WARNING
The units 6SE70 are operated with high voltages.
All work on the unit must only be carried out by qualified persons.
Non-observance of warning notices can result in death, severe personal injury or
considerable property damage.
Owing to the dc link capacitors, a hazardous voltage still prevails inside the unit for up to 5
min. after deactivation. This is why it is only permitted to open the unit after a
corresponding waiting period.
When working on the open unit, pay attention to the fact that live parts are exposed.
Even when the motor is at standstill, the following parts of the unit may be carrying a live
voltage:
- the mains connection terminals U1/L1, V1/L2 and W1/L3
- the output terminals C/L+ and D/L-
- the terminals of the control terminal strip
The user is responsible for ensuring that the rectifier unit, converter, motor and other units
are installed and connected in accordance with the technical regulations recognised in the
country of installation (in Germany: VDE, VBG4) and other regionally valid regulations. In
doing so, particular attention must be paid to cable dimensioning, fusing, earthing,
deactivation, isolation and overcurrent protection.
NOTES
If there are high capacitances (noise suppression capacitors) between the star point of the mains (earth) and
the dc link, and the dc link is unloaded, it may charge up by
√
2 more than is normally the case.
In the event of an earth fault at the converter output, the current through the freewheeling diodes of the
converters is adequately limited by the precharging resistors during the precharging process. The connected
converters automatically detect earth faults during operation of the inverter.
In the event of phase failure, operation of the main contactor without latching leads to cyclic deactivation and
activation of the main contactor because the phase failure signal is suppressed if a mains failure should occur.
The mains failure on the unit results from dropping out of the main contactor in the event of a fault.
The fan is only activated if the precharging resistors are shorted.
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