Cassette Style
DC-DC Converters
M Series
Edition 01/01.2001
6/25
Input Fuse
A fuse holder containing a slow-blow type fuse (Dimension:
5
× 20 mm) is mounted in the converter's back plate. The
fuse protects the module against severe defects. It may not
fully protect the module at input voltages exceeding
200 V DC. In applications where the converters operate at
DC source voltages above 200 V DC, an external fuse or a
circuit breaker at system level should be installed.
For applications where the fuse should be inaccessible: see
Option F.
Input Under-/Overvoltage Lock-out
If the input voltage remains below 0.8
Ui min or exceeds
1.1
Ui max (approx. values), an internally generated inhibit
signal disables the output(s). When checking this function
the absolute maximum input voltage rating
Ui abs must be
carefully considered (see table:
Input data). Between Ui min
and the undervoltage lock-out level the output voltage may
be below the value defined in table:
Output data (see: Tech-
nical Information: Measuring and Testing).
Ui DC
________
Ui min DC
2
345
6
1
0.10
1.00
10.00
AM
Ii [A]
LM/LMZ
BM
FM
CM/CMZ
DM/DMZ
EM
04014
350
300
50; 250
40; 200
30; 150
20; 100
10;
50
0
400
0
0.8
2.0
1.0
2.5
1.2
3.0
1.4
3.5
1.6
4.0
0.6
1.5
0.4
1.0
0.2
0.5
AM
BM
CM/CMZ
FM
EM
A…EM
LM
Ii [A]
LM/LMZ
DM/DMZ
t [ms]
LM
A…EM
04015
Fig. 3
Typical inrush current at initial switch-on cycle and at
Ui max [DC] versus time
Fig. 2
Typical input current versus relative input voltage at
nominal output load
Reverse Polarity
Reverse polarity at the input of AM, BM, CM, DM, FM and
CMZ, DMZ types will cause the fuse to blow. In EM, LM and
LMZ types a series diode will protect the module. A series
diode is not incorporated in AM, BM, CM, DM, FM and
CMZ, DMZ types to avoid unwanted power loss.
Inrush Current
The CM, DM, EM, LM and CMZ, DMZ, LMZ (excluding FM)
modules incorporate an NTC resistor in the input circuitry
which (during the initial switch-on cycle) limits the peak in-
rush current to avoid damage to connectors and switching
devices. Subsequent switch-on cycles within a short inter-
val will cause an increase of the peak inrush current due to
the warming up of the NTC resistor. Refer also to:
Option E
description.
Table 3: Fuse types (slow-blow)
Series
Schurter type
Part number
AM 1000...3000
SPT 10 A
250 V
0001.2514
BM 1000...3000
SPT 8 A
250 V
0001.2513
FM 1000...3000
SPT 5 A
250 V
0001.2511
CM/CMZ 1000...3000
SPT 3.15 A 250 V
0001.2509
DM/DMZ 1000...3000
SPT 2.5 A
250 V
0001.2508
EM 1000...3000
LM/LMZ 1000...3000