Corrected from:
- i700 servo inverter V01.06.03.9953
Response of the new version:
The Lenze setting for the parameter (0x605E, 0x685E) 'Response to error' has been changed to:
- 0x605E = -2: Quick stop (or DC-injection braking or short-circuit braking)
With this setting, the motor is optimally braked even in the event of a feedback error (e.g. open circuit).
Asynchronous motors (ASM) by means of DC-injection braking and synchronous motors (SM) by means of short-circuit braking.
What happens? In the case of a feedback fault, unintended movements may occur at the motor shaft.
These unintended movements maximally occur for 4s (with Lenze setting for object 0x2826 "Quick stop: Duration in the event of a fault").
When does the problem occur?
Unintended movements at the motor shaft may occur under the following conditions:
The described response can only occur with version V01.05.03 and higher.
Only starting from this version the parameter (0x605E, 0x685E) 'Response to error' has been newly implemented allowing the user to brake the driven machine in a controlled way via the quick stop function (QSP). So far, operation was inhibited immediately and the machine could only coast to standstill in an uncontrolled way in the event of a fault.
'Response to error' parameter (0x605E, 0x685E):
0x605E = 0: Disable drive function
0x605E = 2: Quick stop (Lenze setting for version V1.5.3)
0x605E = -2: Quick stop or DC-injection braking or short-circuit braking
Which products are affected?
- Only i700 servo inverter V01.05.06.9665
Short-term measures/recommendations:
Set the parameter 0x605E, 0x685E to (-2) and save this setting.
In this way, the DC-injection braking or the short-circuit braking function will be used for braking if a feedback error occurs. In the case of servo control, braking via quick stop (QSP) requires a properly functioning feedback.
With the setting 0x605E, 0x685E = 0, the response would be the same as with the previous version. In this case, the drive controller would be inhibited immediately.
