Brake Transistor And Brake Resistor - Siemens SINAMICS G180 Installation And Operating Instructions Manual

Spare parts and accessories

10.3 Brake transistor and brake resistor

3. Apply voltage to the inverter so that the "READY" LED on the display lights.
4. Increase the resistance at the potentiometer. The inverter must go to "FAULT" at the latest
5. From this time, the inverter cannot be switched on by pressing the <On> button on the
6. Acknowledge the error, e.g. using the <S+I> buttons on the display. The inverter checks
7. If the inverter is ready again, then rotate the potentiometer towards 0 Ω. At the latest at a
8. The safety function is checked automatically when the control voltage of the inverter returns
10.3 Brake transistor and brake resistor
During motor operation the electrical power flow is from the inverter to the motor. During
generator operation the electrical power flow is from the motor to the inverter.
Example: braking flywheels.
The DC link current reverses the direction. The standard version of the inverter cannot feed
energy back into the system. Kinetic energy can be converted into dissipated heat in braking
operation. Approx. 10% braking torque is available in the upper speed range. A braking torque
of up to 50% without additional equipment is achieved in the medium and lower speed ranges
by oversaturation of the motor. With the brake transistor accessory, the same braking as driving
torque is available. The energy occurring is converted to heat using a pulsed transistor. Also
connect an external brake resistor.
Risk of fire
If the clearance between the resistors and the neighboring components is selected too small,
fire can occur due to overheating. This can result in death, serious injury or material damage.
Maintain a minimum clearance of 200 mm.
142
for 3,8 kΩ:
– The "READY" LED goes out.
– The red "FAULT" LED lights.
– The inverter display shows the error message "!!FAULT!! PTC thermistor X3:90/91".
display.
both the redundant shutdown routes for the acknowledgement.
– If the inverter returns to "READY" after the acknowledgement and does not display any
errors, the test has been completed successfully.
– If the inverter remains on "FAULT" and "!!FAULT!! Test PTC X3:90/91" is shown on the
display, one of the shutdown routes did not function correctly. In this case, please contact
the factory.
resistance of 15 Ω the short-circuit monitoring of the sensor circuit responds. Follow the
description under points four and five.
and when the error is acknowledged after a test.
WARNING
Installation and operating instructions Sinamics G180
Operating Instructions, 05/2013, 4BS0751-001