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Cautions
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Precautions for Correct Use of Power Supplies
Installation
Mounting Methods
The standard mounting methods should be used to ensure proper heat dissipation. If other mounting methods must be used, the ambient temperature must be lowered or the load rate must be reduced to prevent temperature increase inside the Power Supply caused by poor heat dissipation. Refer to the information in the table on the right.
DIN Rail Mounting Models: Main Models
| Mounting direction | Standard | Horizontal | Face-up | Face-down |
| Model |  |  |  |  |
| S82K | OK | No | Conditional | No |
| S8TS | OK | No | No | No |
| S8VS(15, 30 W) | OK | No | OK | No |
| S8VS (60, 90, 120,180, 240 W) | OK | No | No | No |
| S8T-DCBU-01 | OK | No | No | No |
| S8T-DCBU-02 | OK | No | No | No |
| S8VM (15, 30, 50,100, 150 W) | OK | No | No | No |
Screw Mounting Models: Main Models
| Mounting direction | Standard | Horizontal | Face-up | Face-down | Horizontal |
| Model |  |  |  |  |  |
| S82J | Yes | Yes *1 | Conditional *2 | Conditional *2 | No |
| S8VM (15, 30, 50, 100, 150 W) | Yes | Yes | Yes | No | No |
| S8VM (300, 600, 1,500 W) | Yes | Yes | No | No | No |
*1.The 300-W model can be used under given conditions.
*2.The 600-W model can be used.
Yes: Can be used
No: Cannot be used.
Conditional: Can be used at an ambient temperature of 50°C (up to 50% of load rate).
Installation Space
When mounting two or more Power Supplies side by side, be sure to provide spacing between them as indicated in the table on the right or greater.
Note:Be sure to provide an installation space that allows for shielding (including ducts).
Spacing Required Between Power Supplies
| Model | Dimension A | Dimension B | Dimension C |
| S82J | 20 | 20 (300, 600 W) | 20 (300, 600 W) |
| S82K | 10 | --- | --- |
| S8VS | 20 | --- | --- |
| S8VM (15, 30, 50 W) | 20 | --- | --- |
| S8VM (300, 600, 1,500 W) | 20 | 50 (300, 600 W) 100 (1,500 W) | 50 |
(Unit: mm)
Note:If more than one S8VM-100[][][][]/150[][][][] Power Supply is mounted together, install them as far away1 from sources of heat as possible. As a guideline, allow at least 50 mm of space on the right and left side of each Power Supply. If only 20 mm of space is allowed, use the Power Supplies at a load ratio of 80% or less.
Extending the Operating Life
The life of a Power Supply is determined by the life of the electrolytical capacitors used inside.Here, Arrhenius' Law applies, i.e., the life will be halved for each rise of 10°C and will be doubled for each drop of 10°C. As a result, the life of the Power Supply can be increased by reducing its internal temperature.
Internal Temperature Reduction The temperature inside a Power Supply will remain constant when the heat generation is equal to the heat dissipated. The internal temperature will rise if not enough heat is dissipated, i.e., the Power Supply must be mounted to allow proper heat dissipation. Due consideration must be given so that the operating ambient temperature of the Power Supply falls within the range specified by the derating curves.
Heat Dissipation with Natural Air Cooling
Provide air holes and an ambient atmosphere that allows air convection
Use a metal plate as the mounting panel.
It is recommended that forced cooling be used as much as possible.
The calorific (heating) value of the Power Supply can be expressed in the following equation.
Maintenance
Slits are provided in the Power Supply case to allow heat generated internally to dissipate externally. It is thus possible for foreign matter and dirt to enter the Power Supply and reduce or interrupt the output. When performing periodic maintenance, always vacuum away any foreign matter and dirt from inside the Power Supply.
Wiring in Consideration of Voltage Drop
Make the input and output wiring as thick and short as possible to minimize voltage drop.
(1)Select a wire diameter suitable for the load current Io.
(2)Make sure that the Power Supply's output voltage Vo does not exceed the specified output fluctuation range.
(3)Consider the allowable current for load short-circuits (guideline: 1.6 times the Power Supply's rated output current or higher).
Selection of Wires
Select wires for the Power Supply carefully. Refer to this table when selecting the wires.
| AWG No. | Crosssectional area (mm2) | Configuration (number of conductors/mm) | Voltage drop per 1 A (mV/meter) | Recommended maximum current (A) | |
| UL1007 (300 V 80°C) | UL1015 (600 V 105°C) | ||||
| 30 | 0.051 | 7/0.102 | 358 | 0.12 | --- |
| 28 | 0.081 | 7/0.127 | 222 | 0.15 | 0.2 |
| 26 | 0.129 | 7/0.16 | 140 | 0.35 | 0.5 |
| 24 | 0.205 | 11/0.16 | 88.9 | 0.7 | 1.0 |
| 22 | 0.326 | 17/0.16 | 57.5 | 1.4 | 2.0 |
| 20 | 0.517 | 26/0.16 | 37.6 | 2.8 | 4.0 |
| 18 | 0.823 | 43/0.16 | 22.8 | 4.2 | 6.0 |
| 16 | 1.309 | 54/0.18 | 14.9 | 5.6 | 8.0 |
| 14 | 2.081 | 41/0.26 | 9.5 | --- | 12.0 |
| 12 | 3.309 | 65/0.26 | 6.0 | --- | 22.0 |
| 10 | 5.262 | 104/0.26 | 3.8 | --- | 35.0 |
Recommended Maximum Current:
Current The table is applicable to wires with 1 to 4 conductors. Keep the current value to within 80% of the values shown in this table when using wires having 5 or more conductors. The following chart shows the voltage drop per meter in terms of the relationship between the current and conductor diameter. Make sure that the current value does not exceed the recommended maximum current value.
Voltage Drop per Meter (UL1015 Vinyl-sheathed Wires for Heat-resistant Equipment)
Note:The current indicates the allowable current. In practice, application must be below the recommended current values.
Wiring to Prevent Noise Interference
Separate input lines and output lines, and use twisted cables.
Noise will be induced on the output lines if they are laid together with or close to input lines.
Use short, thick input lines.Input lines radiate noise, and must therefore be as short and thick as possible.
Do not loop input or output lines.
Loops in lines can radiate noise to other devices or can function as antennas inducing highfrequency noise.
Use short, thick ground wires.
The damping effect of the noise filter built into the Power Supply will be reduced if a long ground wire is used. Always make ground wires as short and as thick as possible.
Connect a noise filter.
Include a noise filter on the input side of the Power Supply if faulty operation in electric circuits connected to the output from the Power Supply are being caused by sources of surge on the AC input line, such as large magnetic relays.
Ground the noise filter with a thick, short wire.
Use shielded cables for the remote sensing and remote control signal lines.
Remote sensing and remote control signal lines must always be wired separately using shielded cables to prevent faulty operation caused by the induction of noise. Noise can be induced when these signal lines are laid together with input lines or power lines, which often carry noise.
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