Corrected from:
i700 servo inverter, V2: from V02.11.12.12375
i700 servo inverter, V1: from V01.11.12.12374
Response of the new version:
When the inverter is inhibited via the STO function, the brake is applied immediately.
Brake control is no longer delayed due to the set error response.
What happens?
The inverter is inhibited via the STO function (safe torque off) by controlling the digital inputs SIA/SIB.
The holding brake is, however, only controlled with delay so that the load is accepted with a corresponding delay.
The time delay depends on the execution time of the error response. Especially the setting under 0x2826 'Quick stop: Duration in case of trouble' is important (Lenze setting: 4s).
When does this behaviour occur?
"Triggering via state machine of device" (0x2820:1 = 0, or 0x3020:1 for axis B) is selected as brake operating mode and the internal i700 brake logic is used.
The parameter 0x605E 'Response in case of quick stop' is not set to 'Controller inhibit' (0x605E = 0), but to 'Quick stop' (0x605E:0 = 2 or -2). Lenze setting: 0x605E = -2.
- The STO function is activated while the selected error response is executed. E.g. after occurrence of an EtherCAT error.
The described behaviour may also occur if the following class 2 errors (light errors) occur instead of the EtherCAT error:
- Error code 0x4380: Motor temperature sensor
- Error code 0x7303: Error in feedback system
- Error code 0x7380: Hiperface communication error
- Error code 0x8181: EtherCAT communication
- Error code 0x8700: EtherCAT sync loss
Which products are affected?
i700 servo inverter, V2
Short-term measures:
Set the parameter 0x605E 'Response in case of quick stop' to 'Controller inhibit' (0x605E = 0).
As an alternative, use the brake logic in the controller.
For this, leave the brake operating mode in the i700 in the default setting: "Triggering via control word from external controller" (0x2820:1 = 1, or 0x3020:1 = 1 for axis B).
Make sure that there is no direct operative relationship between STO and the EtherCAT bus.
Evaluation/recommendations:
The internal i700 brake logic is usually only used for applications with third party controllers.
When using Lenze controllers with FAST Motion, the brake is controlled via the Lenze controller.
The probability of occurrence of the described behaviour is estimated to be rather small.
For applications with active loads, e.g.: hoists, please refer to the "risk analysis" to be performed by the mechanical engineer. The mechanical engineer usually has to provide for a second independent protection system, if major damage may be caused by component errors.
