Setting The Circuit-Breaker - Siemens SINAMICS G150 Operating Instructions Manual

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
Max. connectable cross-section: 4 mm²
NO: normally-open contact, NC: normally-closed contact, COM: mid-position contact
1)
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.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Terminal block X50 – "Circuit breaker closed" checkback contact
Designation
1 NO
2 NC
3 COM
WARNING
1)
Max. switching voltage: 250 V AC
Max. contact rating: 250 VA
Required minimum load: ≥ 1 mA
Electrical installation
4.7 Power connections
Technical data
Max. load current: 10 A
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