Siemens SINUMERIK 840D sl Function Manual page 455

Deactivation
The electronic weight compensation function is deselected by setting the machine data as
shown below:
MD32460 $MA_TORQUE_OFFSET = 0
The deselection takes effect after the next RESET or POWER ON or on selection of softkey
"Activate MD".
5.9.2 Effect on electronic counterweight function of rebooting from HMI
Introduction
HMI is capable of booting the NCK for the purpose, for example, of activating machine data.
The result of this reboot would be that vertical axes would drop a short distance. Use can be
made of the "Reboot Management" function to avoid this problem.
When the management function is appropriately set, the NCK permits the NCK and PLC to
be powered down with a delay and also signals that shutdown is imminent. This allows
enough time for brake activation to prevent vertical axes from dropping.
The Reboot Management function works only in conjunction with controlled Power On via
the HMI. A power failure or hardware reboot does not activate the Reboot Management
function.
REBOOT sequence
The HMI initiates an NCK and PLC reboot using PI service "_N_IBN_SS".
NCK immediately activates alarm 2900 in response to the PI service.
The machine data:
MD10088 $MN_REBOOT_DELAY_TIME (Reboot delay)
specifies the time, which the NCK lets pass from the PI-service till the reboot.
In this time mechanical axis brakes can be activated.
Reactions to alarm 2900
● The following VDI signals are canceled, i.e. set to zero:
● The "Ready" message at relay contacts 72 73.1 73.2 74 is not reset.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Mode group ready
DB11 DBX 6.3 (all BAGs)
Channel ready
DB21, ... DBX 36.5 (all channels)
Axis ready
DB31, ... DBX 61.2 (all axes)
Electronic weight compensation (vertical axis)
Compensations (K3)
455