8108 DC bus overvoltage

Description

Refer to Diagnostic class (standard): 3

Device reactions

Default reaction

Minimum reaction

Drive

AD

AD

Power supply

BP

BP

Multi carrier transport system

AD

–

  • The DC bus voltage is too high.

  • This diagnostic message is triggered if the DC bus voltage exceeds the maximum voltage of the device.

  • In the Lexium 52, Lexium 62 and Lexium 62 ILM the maximum voltage of the device and the maximum voltage of the motor are considered. As soon as the DC bus voltage exceeds one of both values, this diagnostic message is triggered.

Device

Threshold DC bus voltage

Maximum voltage of the device

Maximum voltage of the motor

Lexium 52

820 Vdc

Yes1

Lexium 62 ILD

900 Vdc

Yes1

Lexium 62 Power Supply

  • 420 Vdc if BrakingResistorMode is set to 230 V mode / 0.

  • 860 Vdc if BrakingResistorMode is set to 400 V mode / 1 (default value).

No

Lexium 62 ILM

900 Vdc

Yes

1 The maximum voltage of the motor is being considered as threshold.

The voltage threshold for this diagnostic message depends on the parameter BrakingResistorMode. The parameter MainsVoltageMode has no influence on this threshold.

For Lexium 62 Power Supply there is a level that triggers the diagnostic message 8186 DC bus voltage high before.

For the motor/drive system:

Cause

Solution

Beforehand the diagnostic message 8109 DC bus undervoltage was triggered. After this diagnostic message has been triggered, the braking resistor (Bleeder) is switched to the precharge function.

This is why it is not possible to extract feed in energy from the drive via the braking resistor. The braking resistor can only be used to decrease feed back energy after a successful precharge.

Stop the drives in the application before the diagnostic message is triggered (8109 DC bus undervoltage).

Stop the drives with the diagnostic message 8135 DC bus voltage low or with the parameter DC_BusVoltage.

Detected wiring error: Braking resistor is not connected.

Connect braking resistor.

The braking energy of the motor that is fed back into the DC bus is too high. This leads to an increase in voltage.

  • Brake at a slower rate.

  • Verify and correct if necessary the dimensioning of the braking resistor.

  • Use additional braking resistor for 400 Vac devices.

The mains voltage is too high.

Verify and correct if necessary the mains supply.

Detected hardware error: Servo amplifier inoperable.

Replace the servo amplifier.

  • The DC bus voltage of the multi carrier segment is too high (Udc > 63 Vdc).

For the Multi carrier transport system:

Cause

Solution

The braking unit of the multi carrier connection module does not work correctly.

Verify the wiring of the multi carrier connection module and the settings of the rotary switches for the braking resistor type and the braking resistor voltage (P1/P2).

Detected multi carrier hardware error: The segment is inoperative.

Replace the multi carrier segment.