8.3.1.2 Tripping of the circuit-breaker in case of undervoltage
If a serious fault occurs (e.g. overload in the DC link), the drive is immediately disconnected
from the power supply using the safety shutdown function.
WARNING
Danger to life as a result of residual voltages at the output terminals
This function cannot ensure that the drive stops immediately, nor can it ensure that residual
voltages do not still exist at the output terminals and within the device itself.
High voltages can cause death or serious injury if the safety rules are not observed or if the
equipment is handled incorrectly.
● Always carefully observe the "five safety rules (Page 15)".
The shutdown of the circuit-breaker is triggered by a safety contactor combination.
The plant-side circuit-breaker must be equipped with an undervoltage trip to ensure the wire-
break protection for the circuit-breaker OFF command. If a circuit-breaker OFF command is
issued as a result of an overvoltage trip, the circuit-breaker is switched off so that it is fail-safe.
8.3.1.3 Automatic restart
After the power fails and returns, the drive is automatically switched on again, irrespective of
the length of the power failure. Alarms are acknowledged automatically and the drive is
restarted.
Prerequisites
The following general conditions must be satisfied in order that the drive can be switched on:
● The auxiliary supplies must not fail.
● The power supply for the fans, coolant pumps, and the open-loop/closed-loop controllers
must be maintained.
If the main infeed fails, the pulse block is initiated. The DC link is supported for a short time using
the precharge.
Starting the drive from standstill
This function is suitable for drives with low moment of inertia and load torques where the drive
can be brought to a standstill within seconds, such as pump drives with water in the piping
system.
Starting the drive with the "flying restart" function
This function can also be activated as follows: The function is suitable for drives with high inertia
loads (e.g. fan drives). This function can be used to switch the drive to the motor that is still
rotating.
Operation
8.3 Functions
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
98 Operating Instructions Rev.201910281231 EXAMPLE
To Next Page
Loading...
Need help?
General