Siemens SINAMICS G110D, Руководство по эксплуатации

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Functions
6.8 Protection functions
SINAMICS G110D
128
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
6.8.5 Load torque monitoring (system protection)
Applications with load torque monitoring
In many applications, it is advisable to monitor the motor torque:
● Applications in which the mechanical connection between the motor and load may be
interrupted (e.g. if the drive belt in fan or conveyor belt systems tears).
● Applications that are to be protected against overload or locking (e.g. extruders or
mixers).
● Applications in which no-load operation of the motor represents a critical situation (e.g.
pumps).
Load torque monitoring functions
The inverter monitors the torque of the motor in different ways:
1.
No-load monitoring:
The inverter generates a message if the motor torque is too low.
2. Lock protection:
The inverter generates a message if the motor speed cannot match the speed setpoint
despite maximum torque.
3. Stall protection:
The inverter generates a message if the inverter control has lost the orientation of the
motor.
4. Frequency-dependent torque monitoring:
The inverter measures the current torque and compares it with a parameterized
frequency/torque characteristic.
Table 6- 36 Parameterizing the monitoring functions
Parameter Description
No-load monitoring
P2179 = …
Current limit for no-load detection
If the inverter current is below this value, the message "no load" is output.
P2180 = … Delay time for the "no load" message
Lock protection
P2177 = …
Delay time for the "motor locked" message
Stall protection
P2178 = …
Delay time for the "motor stalled" message