Brake Chopper Monitoring - BONFIGLIOLI ACTIVE CUBE Applications Manual

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5.1.3

Brake chopper monitoring

For PMSMs operating in the field weakening range, a sufficiently dimensioned brake chopper is re-
quired to prevent frequency inverter damage in case of a shutdown.
In operation in the field weakening range, it will be checked before any current impression of the
spindle if a brake chopper is available. This monitoring detects only an existing brake chopper, but not
the necessary dimensioning. This must be performed by the user.
For testing, the brake chopper is switched on for some ms and the response of the DC-link voltage is
evaluated. If the DC-link voltage, within some ms after the brake chopper was switched on, has not
dropped compared to the value before the bake chopper was switched on by the value set in Parame-
ter
Trigger Limit BC-Test
The monitoring process will take 12 ms.
The function is started automatically as soon as a negative current value is entered in Configuration
806 in Parameter
Ref. Isd Lower Limit
is enough if there is a negative value in one of the four data sets.
Monitoring of the brake chopper can be modified or deactivated via Parameter
820. If the parameter has value "0.0 V", the monitoring function is off.
Parameter
No. Identifier
820
Trigger Limit BC-Test
34
820, the error "F1427 braking resistor not connected" will be generated.
744, see Chapter 5.1.1.4 "Operation with field weakening". It
Unit
V
ACU
Spindle Applications
Trigger Limit BC-Test
Setting range
0.0 .. 100.0
Default settings
7.0
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