Siemens SITOP PSU8600 Manual page 188

Engineering and remote access
7.5 Web server
Examples for conversion
ms (milliseconds)
● Buffer component disabled via control command
Buffer modules with double-layer capacitors can be deactivated using a control
command. If the parameters are to be activated, then all of the buffer components in the
system are deactivated. System buffering using buffer components is therefore
deactivated; this function can be used for smoothly commissioning the system.
Note
Deactivation via control command is independent of deactivation via control contact, and
further, has the same priority as deactivation using the control contact. This means that
both options to activate the buffer components (control command and control contact)
must be set at the same time (this corresponds to the default setting), in order to allow
the system to be buffered.
The following parameters are only visible if at least one BUF8600 4 s/40 A or
BUF8600 10 s/40 A module is installed.
● Enable LONGLIFE operating mode
● In order to increase the service life of the buffer modules with double-layer capacitors,
these can be operated in the "LONGLIFE" mode with reduced buffer capacity. When the
buffer module is completely charged, power failures of up to a maximum of 3 s
(6EP4293-8HB00-0XY0) or up to a maximum of 8 s (6EP4295-8HB00-0XY0) can be
buffered with a load current of 40 A.
● Threshold value for sufficient buffer readiness
The charge state of the buffer components in the system can be interrogated using the
threshold value. The value as a percentage refers to the maximum amount of energy that
can be stored; for several buffer components in the system, the sum of the maximum
amounts of energy that can be stored. This means that it can be ensured that a process
is only started if sufficient buffer energy is available to buffer a possible power failure.
● Short-time interruption at output 1 is enabled
If the function is activated, then when the power supply returns during buffer operation,
the voltage at output 1 is interrupted for a time that can be parameterized. This can be
used to automatically restart a PC, which was run down after the start of buffer operation
to back up data, when the power returns.
● Dead time for buffering mode alarm
Using the parameter, the time is defined that must elapse until after the start of buffer
operation an alarm message "Buffer operation" is output. This means that very short
power failures can be easily buffered, and the alarm message suppressed. For power
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s (seconds)
3 000
5 000
15 000
60 000
300 000
m (minutes)
3
5
15
60
300
PSU8600power supply systems
Manual, 04.2016, A5E35883207-7-76
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