Siemens SIMOTICS S-1FL6 - Page 173

Connecting
4.7 Motor holding brake
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2019, A5E36037884-007
171
Note
1)
It is the isolated digital output power supply. Select a proper power supply based on the
relay type (see below for the recommended
relay type). When you use the 24 VDC power
supply, it can be also the controller power supply.
2)
The motor brake can be controlled not only by the brake control signal from the SINAMICS
V90 servo drive but also by external emergency stop.
3)
Make sure that you use different power supplies for the brake (24 VDC) and for the brake
control signal (P24 V) separately to avoid electro
-magnetic interference to electronic
components.
4)
Install a varistor as shown above to suppress the surge voltage or surge curr
ent generated
by an ON/OFF action of the relay (RY).
Varistor (V) used for the power supply of the brake
Note
All the following data on a varistor is provided based on the low inertia motors with a rated
power of 2 kW; however the data is also applica
ble to the low inertia motors of other power
ranges.
Consider the following current-time and voltage-time characteristics when using a varistor to
suppress the surge voltage or surge current:
You may select an appropriate varistor with reference to the table below:
Power supply voltage of the brake
24 VDC±10%
Order information
Manufacturer
EPCOS
Model
S20K20
Specification re-
quirements
Operating temperature
-20 °C to 60 °C
Delay switching frequency
< 10 times/min
Maximum operating DC voltage
26 V
Average power dissipation
0.2 W
Voltage at 1 mA
33 V±10%
Clamping voltage at 20 A (8/20 μs)
65 V
Energy absorption (2 ms) at a time
18 J