Siemens SINAMICS G120P, Руководство по эксплуатации

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Functions
7.7 Application-specific functions
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
383
Table 7- 27 Configuring DC braking when faults occur
Parameter Description
p2100
Setting the fault number for fault response
Enter the fault number, for which the fault response should be changed, e.g.: p2100[0] =
7860 (external fault 1).
p2101 Setting the fault response
Assigning the fault response, e.g.: p2101[0] = 6 (DC braking).
The fault is assigned an index of p2100. Assign the same index of p2100 or p2101 to the fault and
fault response.
The inverter's List Manual lists in the "Faults and alarms" list the possible fault responses for every
fault. The "DCBRK" entry means that DC braking can be set as response for this particular fault.
7.7.3.3 Dynamic braking
Typical applications for dynamic braking are fans that in no-load operation turn backwards
because of a draft must be braked before the start up.
Principle of operation
CAUTION
Danger of injury due to touching hot surfaces on the braking resistor
In operation, the braking resistor can reach high temperatures, which can cause burns if
touched.
• Allow the braking resistor to cool down before starting any work.
•
Use the appropriate personnel protection equipment, e.g. gloves.
The braking chopper controls the braking resistor depending on its DC-link voltage. The DC-
link voltage increases as soon as the inverter absorbs the regenerative power when braking
the motor. The braking chopper converts this power into heat in the braking resistor. This
prevents the DC-link voltage from increasing above the limit value U
DC link, max
.