Connecting A Cu240S Via Terminals - Siemens SINAMICS G120 Operating Instructions Manual

4.2.1

Connecting a CU240S via terminals

Terminal wiring examples for the Control Unit CU240S
Note
To control the CU240S DP or CU240S DP-F via terminals is also possible, but in this case
the parameter settings for command and setpoint source have to be changed.
In this section examples of controlling a SINAMICS G120 inverter with a CU240S via
terminals are shown.
● Basic control with the default settings
● Frequency setpoint and an additional setpoint via terminals
● Frequency setpoint and an additional setpoint via terminals
Basic control with the default settings
When shipped from the factory the G120 inverter (control unit and power module) must not
be operated before the values depending on the specific PM are read into the CU.
This can be done via:
● downloading a valid parameter set from an MMC or an OP
● quick commissioning
● a factory reset
To operate the inverter with the basic settings (e.g. after factory reset, without additional
parameterization or DIP switch setting), the following conditions have to be fullfilled:
● The rated current of the inverter is at least as great as the rated current of the motor.
● The power range of the inverter matches the power range of the motor.
● The controlled motor is a 4-pole motor (best Siemens 1LA7).
● The rated motor frequency is 50 Hz, power dimension unit is kW.
Control settings
Digital and analog inputs for commands and setpoints are parameterized for a cabling as
shown in the following figure. Furthermore the state of the inverter is monitored via digital
and analog outputs.
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
(AI0 and AI1 used as voltage inputs)
(AI0 and AI1 used as current inputs).
4.2 Connecting the Control Unit via terminals
Installing/Mounting
4-5