GENERAL
SM3300
8 / 30
DELTA ELEKTRONIKA B.V.
rev. Jan. 2022
4
GENERAL
4.1
DC OUTPUT
The SM18-220, SM66-AR-110, SM100-AR-75, SM330-AR-22
and SM660-AR-11 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. Figure 4 - 1 shows the output
ranges.
4.2
AUTO-RANGE
The SM66-AR-110, the SM100-AR-75, the SM330-AR-22
and the SM660-AR-11 feature an AUTO-RANGING 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 SM66-AR-110 the maximum output
power is available at both 33V and 66V.
For SM100-AR-75 this is at both 50V and 100V, for the
SM330-AR-22 this is at both 165V and 330V and for the
SM660-AR-11 this is at both 330V and 660V.
4.3
MAX OUTPUT POWER
The standard output range of each of the SM3300 units is
chosen in such a way, that the unit can deliver more than
3300W. Most units can deliver around 3600W but this
depends strongly on the input voltage and ambient
temperature.
For example the SM18-220 on a three phase 400VAC input
voltage can deliver approximately 3700W. Thus at 18V the
maximum output current is 205A. When using it on 17V, the
maximum current is 220A.
On 230VAC single phase the power is derated to
approximately 3000W, thus delivering maximum 18V / 166A
or 13.5V / 220A.
For the SM18-220 the full range of 18V and 220A (=4000W)
cannot be used simultaneously because the input power is
limited to 3750W. See datasheet for more details.
4.4
OVERLOAD PROTECTION
The power supply is fully protected against all overload
conditions, including short circuit.
4.5
INPUT VOLTAGE
The power supplies work on a single phase or three phase
input voltage and have a wide input voltage range.
In case of a low input voltage, the AC-Fail status will be high.
When operating on a 3 phase input voltage, no neutral
connection is required.
4.6
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 input
current will be relatively low.
The peak inrush current is electronically limited. Switching on
and off repeatedly will not result in excessive currents.
4.7
INPUT POWER WITH OUTPUT OFF
The unit consumes very little power when the output is
switched off. This makes it possible to leave the input power
on when the output is disabled using the Output On/Off
function.
The output can be switched On/Off via a push button on front
panel or by remote programming.
fig 4 - 1
DC Output voltages and currents.
Every point in hatched area can be used
