Delta Elektronika SM 120-13 User Manual

GENERAL SM1500
6 / 22 DELTA ELEKTRONIKA B.V. rev. Jan. 2021
3
GENERAL
3.1
DC OUTPUT

The SM15-100, SM35-45, SM52-30, SM52-AR-60, SM70-22,
SM120-13, SM300-5 and the SM400-AR-8 can either be
used as a constant voltage source with current limiting or as
a constant current source with voltage limiting. The change of
mode occurs sharply at the crossing of the voltage and
current settings. Fig. 3 - 1 shows the output ranges.

The SM52-AR-60 and the SM400-AR-8 feature an
AUTORANGING facility where the power supply
automatically switches over between two current ranges. This
switching, which is unnoticeable for the user, results in a
versatile power supply with twice the output voltage range.
This means that for the SM52-AR-60 the maximum output
power of 1560 W is available at both 26 V and 52 V. For the
SM400-AR-8 this is 1600 W at both 200 V and 400 V.

DISPLAY CV/CC SETTINGS FUNCTION
The settings of the voltage and current control (also when
programmed) can be observed on the front panel meters by
pressing the Display CV/CC Set- tings button. This allows the
current limit to be set when operating in the CV the voltage
limit to be set C mode without opening the load leads.

OVERLOAD PROTECTION
The power supply is fully protected against all overload
conditions, including short circuit.
3.2
AC INPUT VOLTAGE

The power supplies have a wide AC input voltage range.

The unit needs a single phase input voltage. At voltages
below about 120 VAC the output power has to be derated,
see specifications in the datasheet.
3.3
AC INPUT CURRENT

The unit has active power factor correction (PFC). The input
current will therefore almost be a sine wave. This means that
the RMS-value and the harmonic distortion of the AC input
current will be relatively low.

The peak inrush current is electronically limited. Switching on
and off repeatedly will not result in excessive currents like
with NTC circuits.
3.4
STANDBY AC INPUT POWER

The unit consumes very little power when in standby. This
makes it possible to leave the AC input power on when the
output is disabled using the Output On/Off push button on
front panel or the Remote ShutDown input (pin 5 on
connector CON E on the rear panel).
3.5
EFFICIENCY

The efficiency is very high and constant over a wide DC
output current range.

High efficiency means low power loss and low heat
generation.
3.6
CV REGULATION

The specified CV-load regulation value is measured directly
on the DC power terminals. This is because at high current, a
few cm of cable can have a voltage drop of several mV.
3.7
CC REGULATION

For accurate CC-load regulation, do not use external voltage
sensing.

A voltage between S- and minus output will create an error of
about 0.04 % per volt.

A voltage between S+ and + is not critical. The CC-stability is
also affected by external voltage sensing.

Note: when the unit operates in CC-mode, the DCF-LED will
be on. When the unit is in CC-mode most of the time, it is
possible to disable the LED with DIP switch 3 on SW1 (rear
panel).
fig 3 - 1
DC Output voltages and currents.
Every point in hatched area can be used
fig 3 - 3
Measuring ripple voltage
RIGHT!
fig 3 - 2
Measuring ripple voltage
WRONG!

Delta Elektronika SM 120-13 Specifications

General

Brand	Delta Elektronika
Model	SM 120-13
Category	Power Supply
Language	English