Eliminated from:
9400 HighLine SW V7.0
Behaviour of the new version?
The calculation algorithm for I^2xt monitoring (display code C0138) has been adapted. The corresponding utilisation has been changed to provide a better approximation of conditions in the field.
Description of the problem
I^2xt monitoring for the brake resistor results in an error message and the drive being disconnected.
When does the problem occur?
The behaviour can only occur if a brake resistor is connected to terminals Rb1 and Rb2 and if it is parameterised correctly via codes C0129 to C0131.
Which products are affected?
9400 HighLine SW ≤ V5.1
Diagnostics options?
The I^2xt utilisation of the brake resistor in C0138 is already showing a high value, although the brake resistor is only just warm to the touch.
Short-term measures/recommendations?
- Increase the thermal capacity of the brake resistor in C0131 until the value displayed in C0138 reflects the actual conditions. Experience has shown that increasing the thermal capacity by a factor of 4 to 6 will give a usable result.
- Disable the error response for I2xt monitoring of the brake resistor in codes C0571 and C0574.
Evaluation:
I^2xt monitoring of a connected brake resistor is triggered too early, i.e. the internal overload calculation (display code C0138) provides an excessively high utilisation value, although in reality the connected brake resistor is not yet operating at full thermal capacity.
Components cannot be damaged beyond repair (due to thermal overloading), as the monitoring function responds too early.
Published with Service Message No. 38/2009
