Change-Over Switch - Siemens SITOP Series Operating Instructions Manual

2.5

Change-over switch

Figure 2-5
The two switches A and B are used to influence the output characteristic curve:
Switch
A
influences the output
characteristic in the
load range
B
influences the output
characteristic in the
overload range
Delivery state: A - OFF; B - OFF
SITOP PSU8200 1ph
Operating Instructions, 06.2014, C98130-A7633-A1-2-7629
Selector switch (example: 6EP3333-8SB00-0AY0)
ON
Parallel operation:
'Soft' characteristic curve (see, e.g. Figure 6-5 Output
characteristic curve 6EP3333-8SB00-0AY0 parallel
operation (Page 34)) for the parallel operation of two
or more devices: The output voltage falls with
increasing output current (namely, also for the
overcurrent pulse!).
This means that for full output current the highest
output voltage can normally no longer be attained.
Latching shutdown:
If the output current rises above the rated value and
above the current limit, the device reduces the output
voltage (see, e.g. Figure 6-7 Output characteristic
curve 6EP3333-8SB00-0AY0 latching shutdown
(Page 35)). If the output voltage falls below 20 V, the
device shuts down latching, the red LED lights up.
This limit voltage of 20 V is independent of the set
output voltage. The 'Short-time overload current'
feature is not available in this operating mode.
Turning the power supply off for at least 60 seconds
or a remote OFF and ON on the remote contact
causes a reset (only with 6EP3333-8SB00-0AY0 and
6EP3334-8SB00-0AY0).
To also guarantee the upload of large capacitances at
the output in this operating mode, a non-latching
shutdown is performed during the first 10 seconds
after power on or remote ON. During these first ten
seconds, the device responds for overload as if the
switch is OFF.
Description, device design, dimension drawing
OFF
Single operation:
Delivery state
'Hard' characteristic curve (see, e.g.
Figure 6-3 Output characteristic curve
6EP3333-8SB00-0AY0 stand-alone
operation (Page 34)) for normal operation
(single operation): The output voltage is
independent of the output current.
Constant current:
Delivery state
If the output current rises above the rated
value and above the current limit, the
device reduces the output voltage. The
yellow LED lights up if the output voltage
falls below 20 V.
2.5 Change-over switch
13