Eliminated from:
Inverter Drives 8400 StateLine, HighLine and TopLine from firmware version 12.00.00.00
Behaviour of the new version?
The DC-bus voltage is now displayed correctly and the brake chopper and LU-thresholds are applied correctly.
Which products are affected?
Inverter Drives 8400 StateLine, HighLine and TopLine with a firmware version lower than 12.00.00.00
Only 230 V devices: E84AVxxxxxx2
What happens?
• The displayed DC-bus voltage in C0053 and LS_MotorInterface.nDCVoltage_a is 5 V too high.
• The LU-monitoring function is only activated when the actual DC-bus voltage is 5 V below the limit value expected.
• The OU-monitoring function is only activated if the actual DC-bus voltage is 1.6 V above the limit value expected.
• The brake chopper does not switch on at the expected threshold.
C0173 = 0: Brake chopper ON at 363 V instead of 380 V as expected
C0173 = 1: Brake chopper ON at 368 V instead of 380 V as expected
C0173 = 2: Brake chopper ON at 388 V instead of 380 V as expected
C0173 = 3: Brake chopper ON at 396 V instead of 380 V as expected
C0173 = 4: Brake chopper ON at 363 V instead of 205 V as expected
When does the problem occur
In the case of all 230 V devices.
Diagnostics options?
In the case of the 230 V devices, the DC-bus voltage cannot be measured directly using a multimeter, since no DC-connections are led to the outside. This makes it more difficult to diagnose the actual DC-bus voltage.
The DC-voltage that is pending while a brake chopper switched on can be measured at X105 Rb1 and Rb2.
Short-term measures/recommendations?
• The display of the DC-bus voltage in the device cannot be adapted.
• The threshold for the LU-monitoring can only be reduced and not increased in C0176/1.
• The OU-threshold cannot be adapted.
• The brake chopper threshold can be reduced by maximally 150 V via C0174.
Evaluation:
The display of the DC-bus voltage is usually only applied for diagnostic purposes. The incorrect trigger thresholds of the monitoring for overvoltage and undervoltage have no impacts of practical relevance.
The delayed switch-on of the brake chopper may result in an activation of the OU-monitoring in the case of very dynamic applications with great mass inertias.
