SINAMICS S120 Combi 
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3 
103 
External fan unit 
5
5.1  Description 
The S120 Combi provides an integrated fan control and supply for an external 24 V fan unit. 
The fan unit is connected via interface X12/X13. The output is designed for a maximum 
current of 2 A and is short-circuit and ground-fault proof. 
The following functions are available when using the external fan unit: 
●  Operating hours counter (p0251) 
●  Setting the maximum operation time (P0252) 
●  Evaluating fault signals