Siemens SITOP PSU8600 Manual page 297

● 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 equipped 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.
● Short-time interruption at output 1 is enabled
If the function is activated, then when the power supply returns during buffering, 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 mode to back
up data, when the power returns.
● 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.
● Time X: Dead time until start of short-time interruption sequence
The parameter is used to define the time that must elapse after using the buffer mode,
before an alarm message "Buffer mode" is output. This means that very short power
failures can be easily buffered, and the alarm message suppressed. For power failures
that last for a longer period of time, the alarm message can then be used to initiate other
specific measures, for example, safely running down a PC.
● Time A: Waiting time until short-time interruption
The parameter is used to define the time that must elapse after the "Buffer mode" alarm
message, before the output voltage at output 1 is automatically interrupted when the
power supply returns during buffering.
Select this time so that it is significantly longer than the expected time for safely and
reliably running down the PC. This is because at the latest when this time expires, the
voltage at output 1 is automatically interrupted - independent of whether the shutdown
has been completed or not.
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76
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