Siemens SINAMICS V90 Operating Instructions Manual page 127

For 400 V variant servo drive
Surge absorber and diode used for the power supply of the brake
Note
All the following data on a surge absorber or diode is provided based on the low inertia
motors with a rated power of 2 kW; however the data is also applicable to the low inertia
motors of other power ranges.
Consider the following current-time and voltage-time characteristics when making a decision
to use a surge absorber or a diode to suppress the surge voltage or surge current:
Recommended surge absorber
Power supply voltage of the brake
Order information
Specification
requirements
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002
Manufacturer
Model
Operating temperature
Delay switching frequency
Maximum operating DC volt-
age
Average power dissipation
Voltage at 1 mA
Clamping voltage at 20 A
(8/20 μs)
Energy absorption (2 ms) at a
time
4.7 Motor holding brake
DC 24 V
EPCOS
S20K20
-20 °C to 60 °C
< 10 times/min
26 V
0.2 W
33 V±10%
65 V
18 J
Connecting
127