IMX4 Series Data Sheet

4 Watt DC-DC Converters

BCD20006-G Rev AE, 16-Sep-2015

Page 11 of 12

MELCHER

The Power Partners.

Safety and Installation Instructions

Installation Instruction

Installation of the dc-dc converters 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.

Connection to the system shall be made via a printed circuit

board; see Mechanical Data.

The converters should be connected to a secondary circuit.

Do not open the converter.

Ensure that a converter failure does not result in a hazardous

condition.

To prevent excessive current flowing through the input lines in

case of a short-circuit, an external fuse specified in table 6

should be installed in the non-earthed input supply line.

Pin Allocation

Fig. 18

Foot print

Table 12: Pin allocation for standard and option Z

Pin

Single-output models

Dual-output models

2Vi–

Vi–

3Vi–

Vi–

10

n.c.

--

11

--

Vo–

14

Vo+

Vo+

16

Vo–

Go

22

Vi+

Vi+

23

Vi+

Vi+

Table 13: Pin allocation for option K

Pin

Single-output models

Dual-output models

1Vi+

Vi+

2

n.c.

--

10

--

Go

11

--

Go

12

Vo–

--

13

Vo+

Vo–

15

--

Vo+

24

Vi–

Vi–

Table 14: Electric strength test voltages

Characteristic

Input to output

Unit

5IMX4

20/40IMX4 70IMX4

Factory test >1 s

0.77

1.5

kVAC

Equivalent DC test voltage

1.0

2.0

kVDC

Coupling capacitance

2.2

typ. 1.1

typ. 1.1

nF

Insulation resist. (500 VDC)

--

>100

>100

M

Ω

1

Converters produced 2013 or later; older units were tested with

1.2 kVAC.

1

12

13

24

10013b

Bottom view

Standards and Approvals

The converters are approved according to UL/CSA 60950-1 and

The converters have been evaluated for:

• Building-in

• Basic insulation input to output, based on their maximum

input voltage

• Pollution degree 2 environment

• Connecting the input to a secondary circuit, which is subject

to a maximum transient rating of 1500 V for 20IMX4 and

40IMX4, and 2000 V for 70IMX4 models.

The converters are subject to manufacturing surveillance in

accordance with the above mentioned standards and with ISO

9001:2008.

Railway Applications

To comply with railway standards, all components are coated

with a protective lacquer (except option Z).

Protection Degree and Cleaning Liquids

The protection degree of the converters (except opt. Z) is IP 40

for models with Revision BA (or later). Older models have IP 30.

In order to avoid possible damage, any penetration of cleaning

fluids should be prevented, since the power supplies are not

hermetically sealed.

However, open-frame models (option Z) leave the factory

unlacquered; they may be lacquered by the customer, for

instance together with the mother board. Cleaning agents are

not permitted – except washing at room temperature with

isopropyl alcohol. If necessary, the mother board must be

cleaned, before fitting the open-frame converter.

Note: Cleaning liquids may damage the adhesive joints of the

ferrite cores.

Isolation

The electric strength test is performed in the factory as a routine

test in accordance with EN 50514 and IEC/EN 60950. The

Company will not honor any warranty claims resulting from

incorrectly executed electric strength field tests.