Siemens SITOP PSU8600 Manual page 19

Image 2-1
Note
Restriction when using a SITOP BUF8600 4 s/40 A buffer module in a 40 A- power supply
system
When using a SITOP BUF8600 4 s/40 A buffer module in a 40 A power supply system, the
150 % overload capability for 5 s/min (Extra-Power) is not supported.
The buffer mode is immediately exited if, during the buffer mode, a system overload > 100 %
occurs.
When using a buffer module with double-layer capacitors, the following additional functions
are available:
Brief interruption of the voltage at output 1
If a PC is operated on the PSU8600 power supply system, when the power fails, then this
must be run down in plenty of time before the buffer time expires in order to avoid data being
lost. If the supply voltage returns after the shutdown has already started, the buffer mode is
exited and the power supply resumes normal operation. However, the PC is run down
completely. If the PC does not have an ON/OFF-switch, then it can only be rebooted by
switching off the power supply and switching it on again.
When using a buffer module with double-layer capacitors, the "Enable short-time interruption
at output 1" function is used to activate the brief interruption of the voltage at output 1 when
the supply voltage returns. However, the selection and parameterization is only possible
when appropriately configured (web server, STEP 7).
You can find additional information in Chapter Engineering and remote access (Page 117)
"Longlife" mode
In order to increase the service life of the buffer modules with a double-layer capacitors, this
can be operated in the "Longlife" mode with reduced buffer capacity. When the buffer
PSU8600power supply systems
Manual, 04.2016, A5E35883207-7-76
Typical buffer time as a function of the load current
Description, device design, dimension drawing
2.3 Description of the buffer modules
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