Commissioning
4.2 Preparing commissioning
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
59
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
is used for applications involving pumps, fans or motors with belt drives.
● For closed-loop vector control, the speed deviations between the setpoint and actual
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.
Which command and setpoint sources are used to control the motor?
The command and setpoint sources available are specified by the inverter's Control Unit.
On Control Units with a PROFIBUS interface the specified commands and setpoints are
preset by the control. For all other Control Units the digital inputs and analog inputs are
preset.
● Possible command sources
– Fieldbus (when commands are specified by a control) - can be selected using P0700
– Digital inputs - can be selected using P0700
– Operator Panel
– STARTER PC tool (in the commissioning phase with the "operator panel")
● Possible setpoint sources
– Motorized potentiometer - can be selected using P1000
– Analog setpoint - can be selected using P1000
– Fixed frequency - can be selected using P1000
– Fieldbus - can be selected using P1000
– STARTER PC tool (in the commissioning phase with the "operator panel")
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
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