GENERAL
EST150
5 / 9
DELTA ELEKTRONIKA B.V.
rev. Jan. 2021
insulation between the primary components and case will
break down when 3750 Vrms is applied between input and
output (2500 Vrms + 600 V DC < 3750 Vrms). See also fig. 2
- 6).
Note: when testing the insulation, take care to slowly (e.g. in
one second) charge and discharge the capacitors between
input - case and output - case. This to prevent high peak
currents, which could destroy the power supply. Make sure to
discharge the capacitors completely before using the unit
again.
2.11
RFI SUPPRESSION
Both the input and output have RFI filters, resulting in very
low conducted RFI to the line and load. Due to the output filter
the output voltage is very clean, having almost no spikes.
The combination of RFI filters and the closed metal case
results in a low radiated RFI.
2.12
OPERATING TEMP
At full power the operating temperature range is
–20 to
+50 °C.
From 50 to 60 °C the output current has to be derated linearly
to 75 % at 60 °C (see fig. 2 - 7). These temperatures hold for
normal use.
2.13
THERMAL PROTECTION
A thermal switch shuts down the output in case of insufficient
cooling. After cooling down, the unit will start working again.
2.14
HOLD - UP TIME
The hold - up time depends on the load, output voltage and
line input voltage. A smaller load or a lower output voltage
results in a longer hold - up time (see fig. 2 - 8). The influence
of the line input voltage is limited because of the active PFC.
2.15
TURN ON DELAY
The output voltage is available 0.25 sec after mains switch
on.
2.16
INRUSH CURRENT
The inrush current is limited with a 30 Ohm NTC to about 10
A when the NTC is cold.
2.17
COOLING
The cooling is by natural convection, no noisy blowers are
present. The unit should have sufficient free space. A
distance of minimum 5 cm around the unit is recommended.
For long life the temperature of the air surrounding the unit,
should be below 35 °C under normal conditions.
Under extreme conditions it should be below 50 °C.
2.18
SERIES OPERATION
Series operation is allowed up to 600 V total voltage. The
power supplies can be connected in series without special
precautions.
Note: when two or more outputs are connected in series, the
maximum current is limited by the highest CC potmeter
setting.
2.19
PARALLEL OPERATION
Parallel operation of the units has no limitations. The power
supplies can be connected in parallel without special
precautions.
