Siemens SITOP BUF8600, Manual

Page: 160 / 252

Engineering and remote access
7.4 SIMATIC STEP 7
PSU8600power supply systems
160
Manual, 04.2016, A5E35883207-7-76
Output parameters
Parameter Value range Default setting
Setpoint output voltage 4 - 28 V 24.0 V
Response threshold of the output current 0 - 10 A or 0 - 5 A 10 A or 5 A
Prewarning threshold output current 0 - 100 % 90 %
On delay Variable Dependent on the set-
tings in the basic de-
vice
Mode ELECTRONIC
SHUTDOWN /
CONSTANT
CURRENT
ELECTRONIC
SHUTDOWN
● Setpoint output voltage
Define the required output voltage.
● Response threshold of the output current
Define the required response threshold value of the output current for the particular
output.
● Prewarning threshold output current
Using prewarning thresholds for the output current of the individual outputs, you can
identify at an early stage slight (creeping) changes in the current demand of the
connected load. This prewarning function facilitates the highest possible availability of the
system (maintenance function).
Enter a value of "0 %" to deactivate the prewarning threshold.
● ON delay
In order to reduce the load on the overall SITOP PSU8600 power supply system as a
result of simultaneous switch-on current peaks of the loads at the various outputs, an on
delay between the outputs can be selected when switching on.
When the on delay is activated, the outputs are sequentially switched-on with a 25 ms or
100 ms delay time between the outputs, or load optimized.
When the variable on delay is activated, you can assign individual on delay times to the
individual outputs.
● Mode
Two overload responses can be defined for all outputs:
–
In the ELECTRONIC SHUTDOWN mode, overload is permitted for a defined time.
The output is electronically shut down after the limit value has been exceeded (see
Overload shutdown and carrying out a reset (Page 56)).
– In the CONSTANT CURRENT mode, an overload current is continually permissible
(U/I curve) according to a defined characteristic. The overload current is limited to a
maximum of 150 % of the setting value of the current potentiometer for a duration of 5
seconds (LED "ON/OFF/RST" flashes green with 2 Hz); the current is then limited to
100 % of the setting value (LED "ON/OFF/RST" flashes green with 1 Hz) as long as
there is an overload condition.