MEAN WELL RSD-100 Series 100W Railway Single Output DC-DC Converter Owner’s Manual

: August 30, 2024
: MEAN WELL

Table of Contents

Features :
SPECIFICATION
Mechanical Specification
Input Fuse
Parallel and Series Connection
Overload Protection
Immunity to Environmental Conditions
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100W Railway Single Output DC-DC Converter
RSD-100 series

GTIN CODE
MW Search: https://www.meanwell.com/serviceGTIN.aspx

https://www.meanwell.com/Upload/PDF/DC-DC_EN.pdf

Features :

Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
2:1 wide input range
Protections: Short circuit / Overload / Over voltage / Input reverse polarity
4000VDC I/O isolation
Cooling by free air convection
Half encapsulated
Built-in constant current limiting circuit
1U low profile 36mm
All using 105°C long life electrolytic capacitors
LED indicator for power on
100% full load burn-in test
3 years warranty

SPECIFICATION

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Mechanical Specification

Input Terminal Pin No. Assignment :

Pin No.	Assignment
1	DC INPUT V+
2	DC INPUT V-
3	FG

Output Terminal Pin No. Assignment :

Pin No.	Assignment
1	DC OUTPUT -V
2	DC OUTPUT +V

Block Diagram

Input Fuse

There is one fuse connected in series to the positive input line, which is used to protect against abnormal surge. Fuse specifications of each model are shown as below.

Type	Fuse Type	Reference and Rating
B	Time-Lag	Conquer UDA-A, 10A, 250V
C	Time-Lag	Conquer UDA-A, 5A, 250V
D	Time-Lag	Conquer UDA-A, 3.15A, 250V

Input Reverse Polarity Protection
There is a MOSFET connected in series to the negative input line. If the input polarity is connected reversely, the MOSFET opens and there will be no output to protect the unit.
Input Range and Transient Ability
The series has a wide range input capability. Within ± 30% of rated input voltage, it can be executed at full-load operation and operate properly; with ±40% of rated input voltage, it can withstand that for 1 second.
Input Under-Voltage Protection
If input voltage drops below Vimin, the internal control IC shuts down and there is no output voltage. It recovers automatically when input voltage reaches above Vimin, please refer to the cruve below.
Inrush Current
Inrush current is suppressed by a resistor during the initial start-up, and then the resistor is bypassed by a MOSFET to reduce power consumption after accomplishing the start-up.
Hold-up Time
- EN50155: 2007 version – D type is in compliance with S2 level, while B and C types are in compliance with S1 level at full load output condition. To fulfil the requirements of S2 level, B and C types require de-rating their output load to 70%, please refer to the curve diagrams below.
EN50155: 2017 version – Comply with S1 level

Output Voltage Adjustment
This function is optional, which the standard product does not have it. If you do need the function, please contact MW for details.

Efficiency vs Load & Vin Curve
The efficiency vs load & Vin curves of each model are shown as below.

Parallel and Series Connection

A.Operation in Parallel
Since RSD-100 series don’t have built-in parallel circuit, it can only use external circuits to achieve the redundant operation but not increase the current rating.

Add a diode at the positive-output of each power supply (as shown as below), the current rating of the diode should be larger than the maximum output current rating and attached to a suitable heat sink. This is only for redundant use (increase the reliability of the system) and users have to check suitability of the circuit by themselves.
When using S.P.S. in parallel connection, the leakage current will increase at the same time. This could pose as a shock hazard for the user. So please contact the supplier if you have this kind of application.

B.Operation in Series
RSD-100 can be operated in series. Here are the methods of doing it:

Positive and negative terminals are connected as shown as below. According to the connection, you can get the positive and negative output voltages for your loads.
Increase the output voltage (current does not change). Because RSD-100 series have no reverse blocking diode in the unit, you should add an external blocking diode to prevent the damage of every unit while starting up. The voltage rating of the external diode should be larger than V1+V2 (as shown as below).

Overload Protection

If the output draw up to 105~135% of its output power rating, the converter will go into overload protection which is constant current mode. After the faulty condition is removed, it will recover automatically. Please refer to the diagram below for the detail operation characteristic. Please note that it’s not suitable to operate within the overload region continuously, or it may cause to over temperature and reduce the life of the power supply unit or even damage it.

Over Voltage Protection
The converter shuts off to protect itself when the output voltage drawn exceeds 115~140% of its output rating. It must be repowered on to recover.
LED Indicator
Equipped with a built-in LED indicator, the converter provides an easy way for users to check its condition through the LED indicator.
Green : normal operation; No signal: no power or failure.
Derating Curve
a.Single unit operation
If the unit has no iron plate mounted on its bottom, the maximum ambient temperature for the unit will be 55 as operating under full load condition. It requires 55℃ de-rating output current when ambient temperature is between 55-70 ℃ , please refer to the de-rating curve as below.

Suitable installation methods are shown as below. Since RSD-100 is a semi- potted model, its thermal performances for the following installation methods are similar and share the same derating curve.

b.Operate with additional iron plate
If it is necessary to fulfil the requirements of EN50155 TX level that operate the unit fully-loaded at 70℃ , RSD-100 series must be installed onto an iron plate on the bottom. The size of the suggested iron plate is shown as below. In order for optimal thermal performance, the iron plate must have an even & smooth surface and RSD-100 series must be firmly mounted at the center of the iron plate.

The load vs ambient temperature curve is shown as below.

Suitable installation methods are shown as below. Since RSD-100 is a semi- potted model, its thermal performances for the following installation methods are similar and share the same derating curve.

Immunity to Environmental Conditions

Test method	Standard	Test conditions	Status
Cooling Test	EN 50155 section 12.2.3 (Column 2, Class TX) EN 60068-2-1
Temperature: -40°C Dwell Time: 2 hrs/cycle	No damage
Dry Heat Test	EN 50155 section 12.2.4 (Column 2, Class TX)

EN45545-2 Fire Test Conditions

Test Items	Hazard Level
Items	Standard
Oxygen index test	455
EN EN ISO 4589-2:1 45-2:2013996	PASS
R22	Smoke density test
Smoke toxicity test	EN 45545-2:2013
NF X70-100:2006	PASS
R24	Oxygen index test
R25	Glow-wire test
R26	Vertical flame test