Siemens SINAMICS S150 NEMA, Руководство по эксплуатации

Страница: 457 / 862

Setpoint channel and closed-loop control
7.3 V/f (V/Hz) control
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
455
Note
Maximum frequency resonance damping
When p1349 = 0, the changeover limit is automatically set to 95% of the rated motor
frequency, but only up to a maximum of 45 Hz.
Function diagram
FP 6310 Resonance damping and slip compensation
Parameters
• r0066
Output frequency
• r0078
Torque-generating actual current value
• p1338
V/f control resonance damping gain
• p1339
V/f control resonance damping filter time constant
• p1349
V/f control resonance damping maximum frequency
7.3.3 Slip compensation
Description
The slip compensation acts so that the speed of induction motors is essentially kept constant
independent of the load (M
1
or M
2
).
When the load is increased from M
1
to M
2
, the setpoint frequency is increased automatically
so that the resulting frequency, and therefore also the motor speed, remain constant. For a
decrease in the load from M
2
to M
1
, the setpoint frequency is automatically decreased
accordingly.
For p1300 = 4 and 7 (V/f controllers with ECO), the slip compensation must be activated to
ensure correct operation.
For p1300 = 5 and 6 (textiles) the slip compensation is internally disabled in order to be able
to precisely set the output frequency.
If a motor holding brake is applied, a setting value can be specified at the slip compensation
output via p1351. A parameter setting of p1351 > 0 automatically activates the slip
compensation (p1335 = 100%).