Melcher W Series 125, 250 Watt AC-DC and DC-DC DIN-Rail Converters Convert Select LWN2660-6E-G

Installation Instructions

The converters of the W Series are components, intended exclusively for inclusion within other equipment by professional installers. Installation must strictly follow the national safety regulations in compliance with the enclosure, mounting, creepage, clearance, casualty, markings and segregation requirements of the end-use application.

DIN-rail mounting is possible with the built-in snap-fit device on a DIN-rail. This fulfills the mechanical transport re quirements as per ETSI 300019-1-2, class 2 (vertical). To fulfill the requirements of IEC 721-3-2, class 2.1 (vertical), 2 additional fixing brackets HZZ00624-G (see Accessories) must be fitted on the bottom side of the DIN-rail. For heavy duty railway applications, we recommend installing all 4 fixing brackets HZZ00624-G.

Chassis or wall mounting is possible using the universal chassis-mounting brackets HZZ00618-G (see Accessories). Such installa  tion complies with IEC 721-3-2, class 2.2 (vertical and horizontal).

Caution: Install the converters vertically, and make sure that there is sufficient airflow available for convection cooling. The minimum space to the next device should be: top/bottom: 30 mm, left/right: 20 mm.

The converters of the W Series are class I equipment: Input terminal 1 ( ) and the output terminals 1 and 11 ( connected to the case. For safety reasons it is essential to connect the input terminal 1 ( ) are reliably ) with protective earth. Output terminals 1 and 11 can be used to connect the output voltage(s) or the load to functional earth.

The phase input (L or Vi+) is internally fused; see Input Fuse. This fuse is de signed to break an overcurrent in case of a malfunction of the converter and is not customer-accessible. External fuses in the wiring to one or both input lines (L and/or N ) may be necessary to ensure compliance with local requirements. A built-in second fuse in the neutral path is available as option F. A second fuse in the wiring to the neutral terminal N or option F is needed if: 

 • Local requirements demand an individual fuse in each source line 

 • Neutral and earth impedance is high or undefined 

 • Phase and neutral of the mains are not defined or cannot be assigned to the corresponding terminals (L Models with Option F: Caution! Double-pole/neutral fusing. to phase and N to neutral). If the converters operate at source voltages above 250 VDC, an external fuse or a circuit breaker at system level should be installed. Caution: 

 • Installation must strictly follow the national safety regulations.

 • Do not open this apparatus

Standards and Approvals The converters of the LW Series with feature E were safety-approved to IEC/EN 62368-1 3rd edition and UL/CSA 60950-1 2nd edition (models without E: IEC/EN 62368-1 3rd edition), IEC 61010-1:C11:2002 (models without E: IEC 61010-1), and EN 50178:1997 (with and without E). The converters are UL508-listed components. The EW models are safety-approved to IEC/EN 62368-1 3rd edition and UL/CSA 60950-1 2nd edition The converters have been designed in accordance with said standards for: 

 • Class I equipment 

 • Power supply for building-in, vertical mounting on 35 mm DIN-rail or on a wall 

 • Overvoltage category II (III for 110 VAC supply) 

 • Basic insulation between input and case, based on 250 VAC 

 • Double or reinforced insulation between input and output, based on 250 VAC and 350 VDC. 

 • Functional insulation between outputs and case. 

 • Functional insulation between outputs. 

 • Pollution degree 2 environment. The converters are subject to manufacturing surveillance in accordance with the above mentioned standards and with ISO9001:2015. Operation at Frequencies Greater 60 Hz The LW Series converters have been tested for operation up to 440 Hz. However, the Y and X caps are not approved to such frequency. The leakage currents are higher than at 60 Hz, whereas the output ripple voltage is lower. Leakage Currents with AC Supply Leakage currents flow due to internal leakage capacitance and RFI suppression Y-capacitors. The current values are proportional to the mains voltage and nearly proportional to the mains frequency. They are specified at maximum operating input voltage where phase, neutral, and protective earth are correctly connected as required for class I equipment. Leakage current may exceed 5 mA, if f i > 63 Hz. Railway Applications The W Series converters have been designed observing the railway standards EN 50155 and EN 50121. All boards are coated with a protective lacquer. The EW Series is particularly suitable for connection to 110 V railway batteries. Isolation The electric strength test is performed in the factory as routine test in accordance with EN 62911 and IEC/EN 62368-1 3rd edition and should not be repeated in the field. The Company will not honor warranty claims resulting from incorrectly executed electric strength field tests.

Safety of Operator-Accessible Output Circuits