Stall Monitoring - Lenze i55AE125B Manual

8.2.5.1

Stall monitoring

The stalling monitoring for the sensorless control for synchronous motors (SL-PSM) switches
off the drive if the motor is about to "stall". A possible cause may be an overload of the motor.
Preconditions
The stalling monitoring only works in the controlled area and if the motor is not operated in
the field 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
•
given on the motor nameplate.
The limit value for stalling monitoring is set in
•
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 operating mode "MS: Velocity mode [-2]" is set in
motor automatically restarts if the trouble does not exist anymore.
Parameter Name / value range / [default setting]
0x2C11:006 High speed range: Stall monitoring limit
0 ... [50] ... 65535 %
• From version 04.00
0x6060 Modes of operation
(P301.00) (Modes of op.)
• Setting can only be changed if the inverter is inhibi-
ted.
-2 MS: Velocity mode
-1 MS: Torque mode
0 No mode change/no mode assigned
2 CiA: Velocity mode
0x2C01:008 (P320.08)
0x2C11:006 to "80 %".
Info
The stall monitoring limit refers to the cosine phi of the motor in per-
cent.
Selection of the operating mode.
Vendor specific velocity mode
Vendor specific torque mode
(from version 03.00)
• Only possible in motor control type
vector control (SLVC) [4]" or "Servo control (SC ASM) [2]".
4Torque control w/ freq. limit
No operating mode (standstill)
CiA 402 velocity mode
Sensorless control for synchronous motors (SL-PSM)
according to the data
0x6060 (P301.00), the
0x2C00 (P300.00)
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Motor control
Motor control selection
= "Sensorless
181