LDD3-1205
2
USER INSTRUCTIONS
1) DESCRIPTION
DIN rail mountable DC-DC converter with 9
–
18 VDC.
To prevent damage in case of reverse polarity, the device is protected by an internal fuse. The internal fuse is not user replaceable.
This DC-DC converter can be used in SELV and PELV circuits.
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 pluggable screw terminals. 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)
Use appropriate copper cables of indicated cross section, designed for the following operating temperatures:
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 1.25 AT / 250 VAC, thus an external short-circuit / overcurrent
protection must be provided by the end user (see Fig.6).
5) DC INPUT CONNECTION
Connect (+) to positive pole, (-) to negative pole. Rated voltage 9
–
18 VDC.
The device is also suitable for photovoltaic or wind turbine applications (see Fig.7).
6) OUTPUT CONNECTION
The device is suitable for
SELV
and
PELV
circuitry.
7) PARALLEL CONNECTION AND REDUNDANCY
Power supplies can be connected in parallel for redundancy connection, an external isolating device must be used (see accessory device).
8) 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.
Overload behaviour:
Up to the overload limit (Ilim), there is no reduction of the output voltage. For currents >In but <Ilim the device operates continuously up to the
intervention of the thermal protection.
Short circuit behaviour:
If Iout > Ilim the device enters hiccup mode protecting the output and the connected load.
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).
9) 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). For these applications the C.C. (Constant Current) mode of current limitation is recommended.
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.
10) OPERATION WITH BATTERY
When a battery is connected in parallel to the Output for backup purposes (see accessory device).