Siemens SINAMICS G120 Operating Instructions Manual page 421

Parameter Description
p1120 Ramp-up time
10.00 [s]
p1121 Ramp-down time
10.00 [s]
Table A- 5 This is how you set the closed-loop type
Parameter Description
P1300 0: U/f control with linear characteristic
1: U/f control with linear characteristic and FCC
2: U/f control with parabolic characteristic
3: U/f control with adjustable characteristic
4: U/f control with linear characteristic and ECO
5: U/f control for drives requiring a precise frequency (textile area)
6: U/f control for drives requiring a precise frequency and FCC
7: U/f control with parabolic characteristic and ECO
19: U/f control with independent voltage setpoint
20: Speed control (without encoder)
22: Torque control (without encoder)
Table A- 6 This is how you optimize the starting behavior of the U/f control for a high break loose torque and overload
Parameter Description
p1310 Voltage boost to compensate ohmic losses
The voltage boost is active from standstill up to the rated speed.
It is at its highest at speed 0 and continually decreases as the speed increases.
Value of the voltage boost at speed 0 in V:
1.732 × rated motor current (p0305) × stator resistance (r0395) × p1310 / 100%
p1311 Voltage boost when accelerating
The voltage boost is effective from standstill up to the rated speed.
It is independent of the speed and has a value in V of:
1.732 × rated motor current (p0305) × stator resistance (p0350) × p1311 / 100%
p1312 Voltage boost when starting
Setting to additionally boost the voltage when starting, however only when accelerating for the first time.
Table A- 7 How to change the inverter pulse frequency
Parameter Description
p1800 Setting the inverter pulse frequency
The pulse frequency depends on the power unit. You can find the setting limits and the factory setting in
Section Technical data, Power Modules (Page 390).
If you increase the pulse frequency, the inverter output current decreases (the maximum output current is
displayed in r0076).
If you use a sine-wave filter, you can only set the pulse frequency to values that are permissible for the
filter.
When operated with an output reactor, the pulse frequency is limited to a maximum of 4 kHz.
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
Appendix
A.4 Parameter
421