i750 (i950) internal brake logic and 'ShutDown OptionCode' 0x605B = [1]: When locking via command 0x6040=0x06, the holding brake is activated with a delay (fixed from V01.03.00)

Removed from:

Servo inverter i750: from V01.03.00

Behavior of the new version:
The device-internal brake logic 0x2820:1=[0] now works as expected.
When the ShutDown command is requested, (0x6040=0x06) the load is now first taken over by the holding brake before the inverter is subsequently disabled and a state change to 'ReadyToSwitchOn' takes place.

Description of the behavior:
i750: Under the conditions specified below, the inverter is disabled immediately after the QSP ramp expires and does not first wait for the holding brake to apply. The inverter is therefore disabled too early and theas torque is immediately set to zero. As a result, an active load can sag until the mechanical brake actually engages
The application of the holding brake can be caused by interactions with the QSP function and occurring toggling of the control signal additionally can be delayed.

Note: For devices with safety functionality, the message Brake error (0xFF02) may appear as a result.

Conditions under which the behavior occurs:

i750 Firmware V01.02.00
Device-internal brake logic active 0x2820:1=[0] and
Setting parameter 'ShutDown OptionCode' 0x605B = [1] (Slow down with QSP, disable drive) and
Lock inverter via command (0x6040=0x06).

Note: Dthe described behavior does not occur if to lock the inverter the command (0x6040=0x07) is used, as in the Lenze system:

Control word 0x6040=0x06 (command 'Shutdown' / 'Shutdown'):
State change after 'Ready to switch on' / 'ReadyToSwitchOn'

Control word 0x6040=0x07 (command 'Disable operation' / 'Disable operation'):
State change after 'Switched on' / 'SwitchedOn'

When commissioning the inverters with affected firmware, the behavior would typically be detected before it can have an impact.
In the event of a device replacement or a firmware update from V01.01.00 to V01.02.00, the probability of detection is lower.

Affected products:

Servo inverter i750, only firmware version V01.02.00

Short-term measures, recommendations, Rating

:
Fast engagement of the holding brake is essential, especially in applications with an active load, e.g. hoists.
The following alternative options are available:

Firmware update to the current i750 firmware version V01.03.00 or
Set parameter 'Shutdown option code' to default: 0x605B=[0] or
Use command 0x6040=0x07 instead of command 0x6040=0x06 to disable the inverter.

[Automatic Translation]

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/202400398/1/