Siemens SINUMERIK 840D sl Commissioning Manual page 953

2.4.2 Configuration of the SITOP UPS module
Buffering parameterization
The UPS module can be used to select whether buffering should be completed after a
predetermined period of time or not until the accumulator's lowest discharge threshold (=
maximum buffer time) has been reached. Both buffering parameterizations result from this.
"Maximum buffer time" mode
This mode enables the system to be shut down in a time-optimized manner. The UPS
module is synchronized with the shutdown of the operating system. Buffering is maintained
until the operating system has been shut down. The operating system must shut down within
a maximum of five minutes (including all applications). Otherwise, the UPS module buffers
for the maximum buffer time (dependent on the accumulator state).
Required settings on the UPS module (USB interface)
PCU-Basesoftware (IM8)
Commissioning Manual, 02/2012, 6FC5397-1DP40-3BA0
On - Off
1 +2V
2 +1V
3 +0.5V
4 +1V
5 +1V
6 +0.5V
7 +0.2V
8 +0.2V
9 +0.1V
10 0.35A / 0.7A
2.4 PCU with SITOP UPS module
Cut-in threshold
+22V fixed
End-of-charge voltage
+ 26.3V fixed
Charging current
Configuring the system
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