NPSM20 Series
Instruction Manual
NPSM20 Series V4.0
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USER INSTRUCTIONS
1) Description:
DIN rail mountable primary switched-mode power supply with 90...264Vac (110…345Vdc) input, suitable for Single phase main line and DC line.
2) Installation:
use DIN-rails according to EN60715. Installation should be made vertically (see Fig.4). For better device stability fix the rail to the wall close to the point where
the device is to be mounted. In order to guarantee sufficient convection, we recommend observing a minimum distance to other modules (see Fig.3).
The device is provided with a thermal protection; a limited air flow can cause the thermal protection tripping.
The SMPS automatically restarts after cooling. To get normal operation reduce the temperature of the air surrounding the power supply, increase the ventilation or reduce the
load (see Fig.8)
3) Connections
: the device is equipped with screw terminal blocks. To avoid sparks, do not connect or disconnect the connectors before having previously turned-off input
power and waited for internal capacitors discharge (minimum 1 minute)
In order to comply with UL certification, use appropriate copper cables of indicated cross section, designed for an operating temperatures of:
60°C for ambient up to 45°C
75°C for ambient up to 60°C
90°C for ambient up to 70°C
Strip the connecting ends of the wires according to the indication and ensure that all strands of a stranded wire enter the terminal connection (see Fig.5)
4) Input protection:
the device input is provided with varistors against overvoltage. Input is provided with internal fuses 1AT/250Vac, thus an external short circuit/overcurrent
protection must be provided by the end user (see Fig.6).
For operation on a single-phase system, a protection fuse on the phase must be provided.
Surge protection:
it is strongly recommended to provide external surge arresters (SPD) according to local regulations.
5) AC input connection:
the device can be connected to single-phase AC lines with Uin 120…240Vac (see Fig.7).
6) DC input connection:
connect L terminal to (+) positive pole, N terminal to (-) negative pole. Rated voltage 110...345Vdc.
The device is also suitable for photovoltaic or wind turbine applications (see Fig.7).
7) Output connection:
The device is suitable for
SELV
and
PELV
circuitry.
Check Uout before connecting the power supply to the load. With output voltage set to the max. value, the continuous [current x voltage] must not exceed the nominal power.
8) Parallel connection and redundancy:
power supplies can be connected in parallel to increase power.
For redundant connection, use an external isolating device must be used (see accessory device).
9) Output protection:
the device is protected against overload (OL) / short circuit (SC) / overvoltage (OV) / overtemperature (OT).
OL and SC:
are controlled by a hiccup mode auto-reset protection with the following behaviour.
OL behaviour:
Max. OL = In x 1.6 with constant output voltage. If the current is
In x 1.6 the unit enters the OL protection and starts an ON/OFF cycle (hiccup mode).
SC behaviour:
the device supplies the indicated short circuit peak current for 40ms if the output current exceeds In x 1.6 the device enters into a controlled ON/OFF cycles
(hiccup mode). The output voltage drops to a voltage value depending on the impedance of the failed load circuit.
Output OV circuit protection
: the output is protected against potential OV due to internal malfunction or coming from the load for Uout
Unom x 1.2 – 1.3, depending on the
model.
OT protection:
turns off the device if the internal temperature exceeds a safe limit.
The device restarts automatically after cooling down. To recover to normal operation reduce air temperature surrounding the power supply, increase cooling or reduce load
(see Fig.8).
10) Feeding DC motors:
it is possible to feed DC motors considering that when a motor starts-up under effort its consumption is much higher than the nominal current and it
can trigger overcurrent protection (see accessory device).
NOTE:
motors can generate high conducted noise on the DC line. Therefore it is not recommended to feed on the same line motors and equipment sensitive to noise.
