Lenze i550

10.2.2 Stalling protecon
The stalling monitoring for the sensorless control of synchronous motors (SL-PSM) switches
o the drive if the motor is about to "stall". A possible cause may be an overload of the motor.
Precondions
The stalling monitoring only works in the controlled area and if the motor is not operated in
the eld weakening range.
Details
In order to detect the motor stalling, the cosine phi is used.
Example:
•
For the cosine phi, the value "0.9" is set in 0x2C01:008 (P320.08) according to the data
given on the motor nameplate.
•
The limit value for stalling monitoring is set in 0x2C11:006 to "80 %".
•
Stalling monitoring is triggered if the current cosine phi is lower than 0.72 (80 % of 0.9).
If stalling monitoring is triggered, the "Trouble" error response takes place. If
the operang mode "MS: Velocity mode [-2]" is set in 0x6060 (P301.00), the
motor automacally restarts if the trouble does not exist any more.
Parameter
Address Name / seng range / [default seng] Info
0x2C11:006 High speed range: Stall monitoring limit
0 ... [50] ... 65535 %
•
From version 04.00
The stall monitoring limit refers to the cosine phi of the motor in per-
cent.
10.2.3 Expert sengs
The parameters for this motor control type are calculated and set automacally while opmis-
ing the control loops.
Details
The motor model-based speed observer requires a rotang machine. Thus, the operaonal
performance of the sensorless control for synchronous motors is divided into two ranges:
1.
Low speed range (|setpoint speed| < lower limit 0x2C11:001)
•
In the range of low speeds, the speed of a synchronous motor cannot be observed. In
this "Low speed range", controlled operaon takes place: During the acceleraon
phase , the current setpoints of 0x2C12:001 and 0x2C12:002 are added and injected
into the motor.
2.
High speed range (|setpoint speed| > lower limit 0x2C11:001)
•
In this area, the rotor ux posion and the speed are reconstructed by means of an
observer. The control is executed in a eld-oriented way. Only the current required for
generang the necessary torque is injected.
Parameter
Address Name / seng range / [default seng] Info
0x2C11:001 High speed range: Lower limit
5 ... [30] ... 100 %
•
From version 02.00
Denion of the lower limit of the high speed range.
•
The lower limit has a permanent hysteresis of 5 %.
0x2C11:002 High speed range: Tracking controller gain
0 ... [200] ... 65535 %
•
From version 02.00
Gain factor for tracking the rotor posion in the motor model.
0x2C11:003 High speed range: Tracking controller reset me
0.00 ... [6.00] ... 655.35 ms
•
From version 02.00
Reset me for tracking the rotor posion in the motor model.
0x2C11:004 High speed range: Tracking controller decouple me
0.0 ... [200.0] ... 6553.5 ms
•
From version 02.00
Temporal hysteresis for the switching back and forth from the open-loop
controlled to the closed-loop controlled operaon.
Conguring the motor control
Sensorless control for synchronous motor (SL-PSM)
Stalling protecon
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