Delta Elektronika ES 030-10, Руководство пользователя

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OPTIONS ES300
11 / 13 DELTA ELEKTRONIKA B.V. rev. Sept. 2019
5 OPTIONS
5.1 REMOTE SENSING
5.1.1 DESCRIPTIONS

The voltage at the load can be kept constant by remote
sensing. This feature is not recommended for normal use
but only when the load voltage is not allowed to vary more
than a few millivolts. Always use a shielded cable for
sensing.

In order to compensate for the voltage drop across the load
leads, the unit will have to supply a higher voltage: Uout =
(voltage drop across each lead) + (voltage across the load)
(see fig. 5 - 1).

The voltage display is connected to the sense leads and
therefore reads the voltage across the load and not the
voltage on the output terminals.

The sense leads are protected for accidental interruption, in
which case the output voltage will go to a max. of 115% of
the set value.
5.1.2 PULSATING LOAD

When using remote sensing on a pulsating load (for
instance a DC-motor), use a capacitor between S+ and +
and between S– and – and a series resistor in the sense
leads (see fig. 5 - 2). Like this the AC-component caused
by the voltage drop across the load leads, is filtered.
5.1.3 OPERATING

Remove the links on the TERMINAL BLOCK (on rear
panel) and connect sense leads (thin shielded measuring
wires) to S+ and S–.

With remote sensing the voltage on the load can be kept
constant. The voltage drop across the load leads will be
compensated. This feature is not recommended for normal
use, because it can easily give problems.

Max. 2 V per load lead can be compensated. Note that the
voltage drop in the leads decreases the max. output
voltage rating. In fig. 5 - 1 it can be seen that on a 15 V
power supply only 11 V will be available on the load when
2x 2 V compensation is used.

In order to prevent interference it is advisable to use
shielded cable for the sense leads. The inductance of the
loads leads could give a problem with pulsating loads. In
this case a large electrolytic capacitor in parallel with the
load will help. Check that the capacitor in combination with
the load leads does not form a resonant circuit resulting in
a large AC current flowing in the leads.

Since the voltage display is internally connected to the
sensing terminals, it will automatically indicate the voltage
on the load. Note that the voltage measured on the load will
be lower than on the output terminals.
5.1.4 MASTER / SLAVE PARALLEL OPERATION WITH
SENSE OPTIONS

Disconnect the links between the S– and – of the slaves
only. If not removed the current sharing will not be
proportional.

The S– and S+ could be connected to the load if desired,
but this is not recommended because of the complexity.
5.1.5 TROUBLE SHOOTING

NO OUTPUT (normal operation)

Check the connections on the TERMINAL BLOCK

(at rear panel), there should be a link b and S+
and between – and S– (see fig. 5 - 3).

MASTER / SLAVE PARALLEL PROBLEMS

Current sharing is not ok. Probably the links between

S– and – of the slaves are not removed.