Increased Stall Power At The Voltage Limit - Siemens SINAMICS S120 Function Manual

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Servo control

5.11 Increased stall power at the voltage limit

Increased stall power at the voltage limit

Function description

As a result of a new voltage management, in operation, the spindle power can be briefly

increased to the stall power limit. The stall power limit is the range in which the motor power is

limited as a result of the maximum converter output voltage. This stall power range is normally

marked in the motor data sheets (voltage limit characteristic) and depends on the motor type

(induction/synchronous motor) and the DC-link voltage magnitude (see figures shown further

An increased stall power is not possible for motors that have sufficient clearance to the voltage

limiting characteristic over the complete speed range.

As a result of the field-orientated control, for operation at the voltage limit there is no danger of

the motor stalling. This applies regardless of whether the operation takes place at the voltage

limit with or without activated increased stall power.

Activation/deactivation effects

Activating and deactivating the increased stall power as the following effect:

● Increased stall power; p1402.6 = 1

– The motor stall torque correction factor can be set via p0388.

– The stall power can be set higher since it will be reduced by a controller as required.

● Normal stall power; p1402.6 = 0

– The motor stall torque correction factor can be set via p0326.

– Stall power must be very precisely set.

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions