Overvoltage Limitation (Option L21) - Siemens SINAMICS G150 Operating Instructions Manual

4.10.4

Overvoltage limitation (option L21)

Description
The option includes the installation of surge arresters and upstream fuses for each line
phase. The signaling contacts of the surge arresters are connected in series for monitoring
purposes and routed to a customer interface.
Safety instruction
Note
Remove the connection clip for the interference-suppression capacitor for operation on an IT
supply
For operation on an IT supply, the connection clip for the interference suppression capacitor
must be removed (see "Electrical installation / removing the connection clip for the
interference suppression capacitor for operation on a non-grounded supply system (IT
supply)").
X700 - monitoring the surge arresters
Table 4- 27
Terminal
1
4
Max. connectable cross-section: 2.5 mm²
NC: normally-closed contact
1)
Reason why the monitoring responded
After the monitoring function responds at terminal block X700:1/4, the cause must be
identified:
● Surge arresters (-A703, -A704-, A705) have a display showing the operating state.
● The upstream fuses (-Q700) are monitored using phase failure monitoring (-B700), which
has an LED status display. In the event of a fault as a result of a defective fuse, the fuses
(-Q700) must be checked, and if required, replaced after removing the fault.
Replacement of the surge arresters
In the event of a fault, the surge arresters must be replaced.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Terminal block X700 Monitoring the surge arresters
Designation Technical data
1)
NC Max. load current:
- at 24 V DC: 1 A
NC
- at 230 VAC: 0.5 A
Electrical installation
4.10 Other connections
125