Siemens SINAMICS S120 System Manual page 100

Braking Modules
7.1 Braking Module Booksize
Terminal X21.1 - inhibit/acknowledge
Applying a high signal to terminal X21.1 inhibits the Braking Module. Fault messages that are
available are acknowledged with a falling edge.
Terminal X21.3 - prewarning
When a prewarning is sent, disconnection of the braking module is imminent. This may be due
to the following causes:
• The temperature of the Braking Module is 80 % of the maximum value.
• 80 % of the maximum switch on duration of the braking resistor has been reached (I
monitoring).
• 80 % of the maximum braking energy of the braking resistor has been reached.
• An incorrect braking resistor is connected (only braking resistors approved by Siemens for
this component are automatically identified).
Terminal X21.4 - fault
The fault can have the following causes:
• Electronics power supply is missing or outside permissible tolerance range
• Enable missing (input terminal)
• Overtemperature
• Overcurrent trip
• I
• Ground fault/short-circuit
In the event of an overtemperature, the fault can only be acknowledged with X21.1 = high after
a cooling-down time.
Electric shock due to hazardous voltage at terminals X21
Hazardous voltages can be present at terminals X21 in the case of a fault. Touching live
components can result in death or severe injury.
• Only connect protective extra low voltages at terminals X21.
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t monitoring has responded.
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WARNING
High Frequency Drive
System Manual, 10/2020, 6SL3097-5AH10-0BP0
t
2