9
05.01
9.12 Operation at power failure
9-295
Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
Operation at power failure with SIMODRIVE 611 digital in conjunction with
SINUMERIK 840D and 840C:
Extended shutdown and retraction: ESR
These more complex functions
can be used in conjunction with the optional
software NC functions in SINUMERIK 840D and 840 C and the digital drives
611D with performance controls.
For certain machining technologies, where several drives are used, e.g. interpo-
lating through electronic gear functions, when power fails, these must be shut
down or retracted in a coordinated fashion using special NC functions.
These functions must be configured by the user for the special requirements of
the machining technology.
In this case, the DC link voltage is monitored against a parameterizable lower
threshold value. If a limit value, which can be adjusted using a machine data, is
fallen below, the NC quickly responds, within a few interpolation cycles via the
digital bus to shut down the drives in a controlled fashion and/or raise, retract
the tools from the machining contour.
Beyond this, e.g. if communications between the NC and drives is interrupted,
for a sign–of–life failure of the NC or other selectable fault messages in the drive
system, the drives can be shut down/retracted, independent of the actual drive
function.
At power failure, the energy required to shut down/retract the drives must be
provided from the energy stored in the power DC link capacitors.
If the energy is not sufficient, the DC link capacitance can be increased using
additional capacitor modules, refer to Section 6. In this case, it is not permissible
that the charge limit of the I/R module is exceeded.
For situations, where the energy in the DC link is still not sufficient to shut down/
attract the drives, additional energy storage can be activated using regenerative
operation. This provides the necessary energy for the drive DC link as an auto-
nomous drive operating mode when line supply faults occur.
The detailed description ”extended shutdown and retraction” –ESR– is included
in the SINUMERIK 840D and 840C documentation, in the sections:
S 840D: Function description, special functions ”axis couplings and ESR”.
S 840C: Start–up Guide 840C “ESR”
9 Important Circuit Information
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