NDR-120/NDR-240 Series Quick Installation Guide
Version 1.1, January 2021
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Terminal Pin Assignment
unit: mm (inch)
NDR-120
Diagram showing the terminal block for the NDR-120 power supply. Pin numbers 1, 2, and 3 are grouped together, and pin numbers 4, 5, 6, and 7 are grouped separately. Labels 'ADJUST' and 'DC OK' are present. Dimensions are indicated.
NDR-240
Diagram showing the terminal block for the NDR-240 power supply. Pin numbers 1, 2, and 3 are grouped together, and pin numbers 4, 5, 6, and 7 are grouped separately. Labels 'ADJUST' and 'DC OK' are present. Dimensions are indicated.
Terminal Pin No. Assignments
| PIN No. | Assignment |
|---|---|
| 1 | FG [Protective Earth symbol] |
| 2 | AC/N or DC- |
| 3 | AC/L or DC+ |
| 4,5 | DC output V- |
| 6,7 | DC output V+ |
LED Indicator
| Indicator | State | Description |
|---|---|---|
| DC OK | On | The power supply can output constant direct current. |
| DC OK | Off | The power supply cannot output direct current. |
Mounting Instructions
Mounting: Mount only as shown in the figure, with input terminals facing downwards to allow sufficient cooling.
Admissible DIN rails: TS35/7.5 or TS35/15.
To attach the NDR-120 or NDR-240 to the rail:
- Rotate the unit backwards, as shown in the figure.
- Fit the top of the unit over the top hat rail.
- Slide it downward until it hits the stop.
- Push the bottom of the unit forward until it snaps into place.
- Move the unit back and forth to make sure it is locked in place.
Diagram illustrating the mounting sequence: 1. Unit rotated backward. 2. Top of unit placed over DIN rail. 3. Unit slid down to the stop. 4. Bottom of unit pushed forward to snap into place. 5. Unit moved to confirm secure locking.
Installation
- To prevent the unit from overheating, always allow sufficient clearance around the unit for proper ventilation: 5 mm left and right, 40 mm above, and 20 mm below. You should also keep a 10 to 15 cm clearance from adjacent devices that act as a heat source.
- The appropriate mounting orientation is vertical; with input terminals at the bottom and output on the top of the NDR-120 or NDR-240. Other mounting orientations, such as upside down, horizontal, or table-top, are not allowed.
- Use copper wire only; the recommended wiring is shown below.
Recommended Wiring
| AWG | 18 | 16 | 14 | 12 |
|---|---|---|---|---|
| Rated Current (Amps) | 7 | 10 | 15 | 20 |
| Lead cross-section (mm²) | 0.8 | 1.3 | 2.1 | 3.3 |
Note: The current each wire carries should be de-rated to 80% of the recommended current when using 4-6 wires connected to the unit. Make sure that all strands of each wire are properly inserted into the terminal connection, and that the screw terminals are securely fixed to prevent poor contact. If the power supply has multiple output terminals, make sure each contact is connected to wires to prevent stress on a single contact from too much current.
Operating Temperature and Wiring Specifications
The maximum operating temperature at full load of NDR-120 is 45°C (113°F) and NDR-240 is 50°C (122°F). Please refer to the derating curve diagrams. Use wire that can withstand temperatures of at least 80°C, such as UL1007.
The recommended wire strapping length is 5 mm (0.197 inch).
Use a slotted type 3 mm screwdriver.
Important Safety Precautions
Before working with a power supply, be sure to read and understand these instructions carefully and completely. You should also follow any notes or instructions on the unit itself.
- Risk of electrical shock and energy hazard: If the device fails, it must be examined by a qualified technician. Do not remove the DIN-rail power supply casing yourself.
- Risk of electric arcs and electric shock (danger to life): Do not connect the primary and secondary sides together, since doing so could result in life threatening shocks.
- Risk of burn hazard: Do not touch the unit while it is in operation or shortly after it has been disconnected.
- Risk of fire and short circuits: Openings on the product should be protected from foreign objects and dripping liquids.
- Pollution level: Only install the unit in a pollution level degree 2 environment.
- Humidity warning: Do not install the unit in locations with high humidity, or near water.
- The FG [Protective Earth symbol] must be connected to PE (Protective Earth).
- Output current and output wattage must not exceed the rated values in the product's specifications.
- Before doing any installation, maintenance, or modification work, disconnect the system from the power source. Make sure that inadvertent connection in circuit will be impossible.
- For continued protection against risk of fire, replace only with fuses of the same type and rating.
Derating Curve Diagrams
NDR-120
Derating Curve: Graph titled 'Derating Curve' for NDR-120, plotting Load (%) on the Y-axis against Ambient Temperature (°C) on the X-axis. It shows derating for 230VAC and 115VAC input voltages. A note indicates that the 12V output is only for 115VAC input.
Static Characteristics: Graph titled 'Static Characteristics' for NDR-120, plotting Load (%) on the Y-axis against Input Voltage (V) 60Hz on the X-axis. It covers input voltages from 90V to 264V for 12V, 24V, and 48V outputs.
NDR-240
Derating Curve: Graph titled 'Derating Curve' for NDR-240, plotting Load (%) on the Y-axis against Ambient Temperature (°C) on the X-axis, showing derating across a temperature range.
Output derating VS input voltage: Graph titled 'Output derating VS input voltage' for NDR-240, plotting Load (%) on the Y-axis against Input Voltage (V) 60 Hz on the X-axis, showing derating across input voltage ranges.
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