Siemens sinamics G120 Operating Instructions Manual page 78
Low voltage inverters chassis devices with cu250s-2 control units and encoder evaluation
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- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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Installing
4.5 Connecting the line supply, motor, and inverter components
Connecting the line supply cable to the converter
Procedure
To connect the converter to the supply system, proceed as follows:
1. If available, open the terminal covers of the converter.
2. Connect the line supply to terminals U1/L1, V1/L2, and W1/L3.
3. Connect the protective conductor of the line supply to terminal PE of the converter.
4. If available, close the terminal covers of the converter.
You have connected the line supply cable to the converter.
Connecting a motor cable to an induction motor
Procedure
To connect the motor cable to an induction motor proceed as follows:
1. Open the motor terminal box.
2. Connect the motor in either a star or delta connection.
3. If you are using a shielded motor cable, you must do the following:
– Expose the shield of the motor cable in the area of the cable entry in the terminal box.
– Attach the cable shield to the motor terminal box using a suitable screw connection.
4. Close the motor terminal box.
You have connected the motor cable to the induction motor.
Depending on your application, you can operate the motor in the star or delta connection
(Y/Δ).
Examples for operating the converter and motor on a 400 V line supply
Assumption: The motor rating plate states 230/400 V Δ/Y.
Case 1: A motor is normally operated between standstill and its rated speed (i.e. a speed
corresponding to the line frequency). In this case, you need to connect the motor in Y.
Operating the motor above its rated speed is only possible in field weakening, i.e. the motor
torque available is reduced above the rated speed.
Case 2: If you want to operate the motor with the "87 Hz characteristic", you need to connect
the motor in Δ.
With the 87 Hz characteristic, the motor's power output increases. The 87 Hz characteristic
is mainly used with geared motors.
Before you connect the motor, ensure that the motor has the appropriate connection for your
application:
78
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Converter with CU250S-2 Control Unit
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