Setting the Braking Resistor Parameters
An insufficiently rated braking resistor can cause overvoltage on the DC bus. Overvoltage on the DC bus causes the power stage to be disabled. The motor is no longer actively decelerated.
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UNINTENDED EQUIPMENT OPERATION |
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oVerify that the braking resistor has a sufficient rating by performing a test run under maximum load conditions. oVerify that the parameter settings for the braking resistor are correct. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
The temperature of the braking resistor may exceed 250 °C (482 °F) during operation.
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HOT SURFACES |
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oEnsure that it is not possible to make any contact with a hot braking resistor. oDo not allow flammable or heat-sensitive parts in the immediate vicinity of the braking resistor. oVerify that the heat dissipation is sufficient by performing a test run under maximum load conditions. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
If you use an external braking resistor, perform the following steps:
oSet the parameter RESint_ext to "External Braking Resistor".
oSet the parameters RESext_P, RESext_R and RESext_ton.
The maximum value of RESext_P and the minimum value of RESext_R depend on the power stage, see chapter External Braking Resistor.
See chapter Rating the Braking Resistor for additional information.
If the regenerated power becomes greater than the power that can be absorbed by the braking resistor, an error message is generated and the power stage is disabled.
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Parameter name HMI menu HMI name |
Description |
Unit Minimum value Factory setting Maximum value |
Data type R/W Persistent Expert |
Parameter address via fieldbus |
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(ConF) → (ACG-) (Eibr) |
Selection of type of braking resistor. 0 / Internal Braking Resistor / ( int): Internal braking resistor 1 / External Braking Resistor / ( Eht): External braking resistor 2 / Reserved / (rSVd): Reserved Type: Unsigned decimal - 2 bytes Write access via Sercos: CP2, CP3, CP4 Setting can only be modified if power stage is disabled. Modified settings become effective the next time the power stage is enabled. |
- 0 0 2 |
UINT16 R/W per. - |
Modbus 1298 IDN P-0-3005.0.9 |
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(ConF) → (ACG-) (Pobr) |
Nominal power of external braking resistor. The maximum value depends on the power stage. Type: Unsigned decimal - 2 bytes Write access via Sercos: CP2, CP3, CP4 Setting can only be modified if power stage is disabled. Modified settings become effective the next time the power stage is enabled. |
W 1 10 - |
UINT16 R/W per. - |
Modbus 1316 IDN P-0-3005.0.18 |
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(ConF) → (ACG-) ( rbr) |
Resistance value of external braking resistor. The minimum value depends on the power stage. Type: Unsigned decimal - 2 bytes Write access via Sercos: CP2, CP3, CP4 In increments of 0.01 Ω. Setting can only be modified if power stage is disabled. Modified settings become effective the next time the power stage is enabled. |
Ω - 100.00 327.67 |
UINT16 R/W per. - |
Modbus 1318 IDN P-0-3005.0.19 |
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(ConF) → (ACG-) ( tbr) |
Maximum permissible switch-on time of external braking resistor. Type: Unsigned decimal - 2 bytes Write access via Sercos: CP2, CP3, CP4 Setting can only be modified if power stage is disabled. Modified settings become effective the next time the power stage is enabled. |
ms 1 1 30000 |
UINT16 R/W per. - |
Modbus 1314 IDN P-0-3005.0.17 |
