Siemens SINAMICS G150, Operating Instructions Manual

Page: 91 / 680

Electrical installation
4.7 Power connections
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
91
4.7.8 Setting the circuit-breaker
Description
The standard circuit breaker is used to disconnect the voltage and provide overload and
short-circuit protection. The circuit breaker is controlled and supplied within the converter.
NOTICE
Material damage caused by switching on too frequently
The cabinet unit can be damaged if it is switched on too frequently.
• Do not switch on the cabinet unit more frequently than every 3 minutes.
Connecting
Table 4- 7 Terminal block X50 – "Circuit breaker closed" checkback contact
Terminal Designation
1)
Technical data
1 NO Max. load current: 10 A
Max. switching voltage: 250 V AC
Max. contact rating: 250 VA
Required minimum load: ≥ 1 mA
2 NC
3 COM
Max. connectable cross-section: 4 mm²
1)
NO: normally-open contact, NC: normally-closed contact, COM: mid-position contact
WARNING
Danger to life due to dangerous electrical voltage from an external auxiliary supply
When the external auxiliary supply is connected, dangerous voltages are present in the
cabinet unit even when the motor starter protector is switched off. Death or serious injury
can result when live parts are touched.
•
Observe the general safety rules when working on the device.
Setting the release current for the circuit breakers
When delivered, the circuit breakers are set to the rated current of the cabinet unit on the line
side. Depending on the plant configuration, it can make sense to set lower values. The
appropriate specifications are given in the operating instructions supplied with the circuit
breaker.