Siemens S120 Permissible voltages, Drive system, Closed-loop control Open-loop control

System integration

7.1 System requirements

Permissible voltages

The following table shows the permissible line voltages of TN line supply systems for the motors.

Table 7- 1	Permissible line voltages of TN line supply systems, resulting DC link voltages and
	converter output voltages
Permissible line		Resulting DC link voltage UZK		Drive output voltage (rms value)
supply voltage				Uamax
400 V		600	V (controlled)	425	V (controlled)
		528	V (uncontrolled)	380	V (uncontrolled)
480 V		634	V (uncontrolled)	460	V (uncontrolled)

In combination with the drive system SINAMICS S120, the motors are generally approved for operation on TN and TT networks with grounded neutral and for IT networks. Protective equipment which will shut down the drive system in the event of a ground fault must be provided for motors operated on IT systems.

In operation with a grounded external conductor, an isolating transformer with grounded neutral (secondary side) must be connected between the supply and the drive system to protect the motor insulation from excessive stress.

Requirements

●The power unit is selected depending on the motor current at torque M0 and a speed 1 [rev/min] or according to the maximum motor current.

●The encoder system used must be harmonized with the particular application.

Drive system

Table 7- 2 Open-loop and closed-loop control systems for the SINAMICS S120 drive system

Closed-loop control	Open-loop control
--	CU-320
SINUMERIK 840D sl	NCU-7x0 / NX1x
SINUMERIK 840Di sl	CU-320
SIMATIC	CU-320
SIMOTION	D4x0 /CX32

Note

Read the corresponding documentation about open-loop and closed-loop control systems.

104	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3