Defining Requirements For The Application - Siemens SINAMICS G120 Operating Instructions Manual

Commissioning
4.2 Preparing for commissioning
4.2.3

Defining requirements for the application

What type of control is needed for the application? [P1300]
A distinction is made between V/f open-loop control and vector closed-loop control.
● The V/f open-loop control is the simplest operating mode for an inverter. For example, it
● For closed-loop vector control, the speed deviations between the setpoint and actual
What speed limits should be set? (Minimum and maximum speed)
The minimum and maximum speed with which the motor operates or is limited regardless of
the speed setpoint.
● Minimum speed [P1080] - factory setting 0 [rpm]
● Maximum speed [P1082] - factory setting 1500 [rpm]
What motor ramp-up time and ramp-down time are needed for the application?
The ramp-up and ramp-down time define the maximum motor acceleration when the speed
setpoint changes. The ramp-up and ramp-down time is the time between motor standstill and
the maximum speed, or between the maximum speed and motor standstill.
● Ramp-up time [P1120] - factory setting 10 s
● Ramp-down time [P1121] - factory setting 10 s
62
is used for applications involving pumps, fans or motors with belt drives.
value are less than for V/f open-loop control; further, it is possible to specify a torque. It is
suitable for applications such as winders, hoisting equipment or special conveyor drives.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB