8
05.01
8.13 Operation when the power fails
8-309
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Operation when the power fails with SIMODRIVE 611 digital in conjunction
with SINUMERIK 840D
Extended stopping and retraction: ESR
These more complex functions can be
used in conjunction with the optional
software NC functions that can be used in SINUMERIK 840D and the digital
drives 611D with High Performance controls.
For certain machining technologies where several drives, for example, interpo-
late with one another using electronic gear functions, when the power fails,
these drives must be stopped or retracted in a coordinated fashion using spe-
cial NC functions.
The user must engineer these functions for the special requirements of the par-
ticular machining process or technology.
Also here, the DC link voltage is monitored for a lower threshold value that can
be parameterized. When a limit value, selected using a machine data is fallen
below, within just a few interpolation clock cycles, the NC quickly responds via
the digital drive bus and stops the drives in a controlled fashion and/or raises,
retracts the tool from the machining contour.
Further, for example, when a connection between the NC and the drives is inter-
rupted, for a sign–of–life failure of the NC or other selected fault signals in the
drive system, the drives can be stopped/retracted using a drive–based function,
i.e. a function that runs autonomously in the drives.
When the power fails, the energy required to stop/retract the drives is supplied
from the energy stored in the capacitors of the power DC link.
If the energy is not sufficient, the DC link capacitance can be increased by add-
ing additional capacitor modules, refer to Chapter 6. However, the charging limit
of the I/R module must not exceeded.
However, for cases where the energy stored in the DC link is still not sufficient to
stop/retract the drives, an additional energy storage device can be activated
through regenerative operation. As an autonomous drive mode when line sup-
ply faults occur, it provides the necessary energy for the drive DC link.
A detailed description of ”Extended stopping and retraction” –ESR– is contained
in the following reference:
References: /FB3/
SINUMERIK 840D/840Di/810D
Special Functions Part 3 ”Axis couplings and ESR”.
Dynamic energy management enables I/RF unit dimensioning to be adapted to
the plant concept in accordance with requirements.
A detailed description of ”Dynamic Energy Management” is contained in the
following reference:
Reference:
/FBA/
SINUMERIK 840D/840Di/810D
Drive Functions, Function Manual (DE1)
8 Important Circuit Information
10.04
05.08
