Switch-mode power supply AC2000 N1 / DC2000 N1 / AC3000 N1 / DC3000 N1 - Operating instructions
80001533 EFE en Page 34 of 41
6.3.2 External sensing line output voltage U
Out
It is possible to regulate a voltage drop of max. 1 V on both the plus
and minus output lines.
For regulation, X11:9 is connected to the positive terminal of the
consumer and X11:10 to the negative terminal of the consumer. In the
event of a sensor line break, regulation is carried out via the device's
internal sensor lines on X2.
The sensor cable must be at least twisted and laid separately from
power cables.
6.3.3 External setpoint specification
The "internal/external" changeover switch (S13) can be used to switch
between the internal and an external voltage setpoint. In the "Int."
position, the device operates with the values for output voltage and
current specified in the technical data (section 4.3.). In the "Ext."
position, the output voltage can be set using an external setpoint. The
"ext." setting is indicated by an LED (H12) on the front of the device.
The current setpoint function is set to the internal setpoint at the factory
and can be changed to an external setpoint on request. The setpoint
for voltage and/or current is specified via the signal connector X11 with
the signals shown in the block diagram. The maximum setting ranges
for current and voltage are achieved with a setpoint value of 4.0 V.
Fine adjustment can be carried out with the potentiometers U
Out
(R14
to R17) and I
Out
≤ (R9). It does not matter which setpoint is selected for
U .
Out
The overvoltage and undervoltage monitoring U
Out
must be adjusted
when using external setpoints. To do this, proceed as described in
6.2.5.
The inputs for external setpoints are galvanically connected to the
output U
Out
(X2:L-)! To obtain defined states, the earth point of the
external setpoints (X11:3 and X11:5) must be connected to the device
earth X11:1.
NOTE:
There is no electrical isolation from the device output voltage U
Out
, i.e.
in the event of positive pole earthing, these inputs assume the
potential of the output voltage! To avoid a short circuit, the external
setpoint input must be electrically isolated from the SNT. The SNT also
offers the option of addressing an external voltage divider with the
device's own +7.5 V voltage in order to realize the external setpoint
setting. The maximum load current of the +7.5 V voltage must not
exceed 10 mA.
NOTE for sections 6.3.2 and 6.3.3:
In order to achieve immunity to HF fields, shielded cables must be
used for analog signals, whereby the shield must be connected to the
earth connection (PE) or to the shield terminal on the front of the
device.
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