RCM500/1000 Series
500/1000 W DC-DC Converters
The RCM500 and RCM1000 Series converters are
reliable power supplies for railway and transportation
systems. They are optimized for 72 or 110 V railway
batteries. The output delivers 24 V with 500 or 1000 W.
The converters are designed for chassis mounting and
exhibit a closed housing with cooling openings.
Many options are available, such as an output ORing
FET for redundant operation, output voltage adjustment,
interruption time of 10 ms, shutdown input, and a monitoring
relay (change-over contact).
Features
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Optimized for 72 V or 110 V railway batteries
Output voltage 24 V
Closed housing for chassis mounting
Extremely high efficiency and high power density
Low inrush current
3 connectors: Input, output, auxiliary (option)
Overtemperature, overvoltage, overcurrent, and
short-circuit protection
Many options available
Compliant to EN 50155, EN 50121-3-2, AREMA
RoHS-compatible for all 6 substances
Fire and smoke: compliant to EN 45545 and NFPA 130
5 year warranty
Safety-approved to the latest edition of IEC/EN 60950-1
and UL/CSA 60950-1
1
1
1
pending
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ................................. 11
Immunity to Environmental Conditions ...............................13
Mechanical Data .................................................................14
Safety and Installation Instructions .....................................15
Accessories ........................................................................17
Description............................................................................1
Model Selection ....................................................................2
Functional Description ..........................................................3
Electrical Input Data .............................................................4
Electrical Output Data...........................................................6
Description of Options ..........................................................9
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RCM Series
Model Selection
Table 1: Standard models
500 / 1000 W DC-DC Converters
Input voltage
V
i min1
[V]
43.2
66
1
2
Output
V
i max1
[V]
90
137.5
110
154
V
o nom
[V]
24
24
24
24
I
o nom
[A]
21
41
21
41
Power
P
o nom
[W]
500
1000
500
1000
Efficiency
2
η
min
[%]
96
96
96
96
96.4
96.4
η
typ
Model
Options
V
i cont
[V]
50.4
77
(72)
(72)
72RCM500-24
72RCM1000-24
110RCM500-24
110RCM1000-24
D, M, Q, F, K
Short time; see table 2 for details.
Efficiency at T
A
= 25 °C,
V
i nom,
I
o nom
,
V
o nom
, only option D fitted.
Part Number Description
110 RCM 500 -24 D M Q F K
Operating input voltage
V
i cont
(continuously):
50.4 – 90 VDC ...........................................................72
77 – 137.5 VDC ........................................................ 110
Series .............................................................................RCM
Output power:
500 W .....................................................................500
1000 W ...................................................................1000
Nominal output voltage:
24 V ...........................................................................-24
Auxiliary functions and options:
Out OK, output voltage adjust, shutdown
1
.................. D
Interruption time ...........................................................M
ORing FET....................................................................Q
Fuse built-in ...................................................................F
Pluggable Connectors ................................................. K
1
Opt. D requires the auxiliary connector.
Note:
The sequence of options must follow the order above.
Note:
All models are RoHS-compliant for all six substances.
Available combinations of options:
72/110RCMxxx-24 (K)
72/110RCMxxx-24D (K)
72/110RCMxxx-24DF (K)
72/110RCMxxx-24DMQ (K)
72/110RCMxxx-24DMQF (K)
Example: 110RCM500-24DMQ: DC-DC converter, input voltage range 77 to 137.5 V continuously, output providing 24 V /21 A, monitoring relay,
output voltage adjust, shutdown input, active current sharing, interruption time 10 ms, integrated ORing FET, RoHS-compliant for
all six substances.
Product Marking
Type designation, applicable safety approval and recognition marks, CE mark, pin allocation, and product logo.
Input voltage range and input current, nominal output voltage and current, degree of protection, batch no., serial no., and data code
including production site, version (modification status) and date of production.
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BCD.00803 Rev AC, 10-May-2018
© 2018 Bel Power Solutions & Protection
Page 2 of 17
RCM Series
500 / 1000 W DC-DC Converters
Functional Description
The input voltage is fed via an efficient input filter and a step-up converter (switching with 2 × 110 kHz) to the high-efficient DC-DC
converter operating at a switching frequency of approximately 90 kHz. The built-in overvoltage limiter protects against input
voltage surges.
The inrush current is limited by an electronic circuitry. A VDR resistor protects against external surges.
If there is no external circuit breaker, the converter can be ordered with built-in fuse (opt. F). This fuse is not accessible.
The circuitry to provide the interruption time (opt. M) is located after the input filter together with the reverse polarity protection
formed by a FET.
The rectification on the secondary side is provided by syn hronous rectifiers, in order to keep the losses as low as possible. The
c
output voltage control logic is located on the secondary side and controls the FETs of the DC-DC converter via insulated drivers.
An auxiliary converter supplies all circuits with a stable bias voltage.
An output ORing FET is available (opt. Q) and allows for a redundant power supply system.
Opt. D encompasses an additional signal connector to allow for output voltage adjustment, active current sharing, primary
shutdown, and an output voltage monitor activating a relay with change-over contact.
The converter is mounted onto a base plate which acts as cooling plate. An additional heatsink for natural convection cooling is
available as accessory. A thermal protection on the input and output side prevents from overheating.
T T
R–
R R
R+
JM201e
SD
SD0
Primary
control logic
Insulated
driver
Insulated
driver
Isolation
Secondary
control logic
OK1
OK2
OK0
NTC
Vi+
Fuse
(option F)
Opt. M
1
VDR
Input
filter
2
C
i
+
+
C
hu
Opt. Q
Vo+
Output
filter
Vi–
PE
C
y
Auxiliary
converter
C
y
Vo–
Auxiliary connector (only with option D)
1
2
Reverse polarity protection (FET) , only fitted with opt. F or M
Bipolar suppressor diode with opt. F or M
Fig. 1
Block diagram
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© 2018 Bel Power Solutions & Protection
Page 3 of 17
RCM Series
500 / 1000 W DC-DC Converters
Electrical Input Data
General conditions:
- T
A
= 25 °C, unless specified.
Table 2a: Input data of RCM500 models
Input
Characteristics
V
i
V
i 2s
V
i nom
V
i abs
I
i
P
i 0
P
i SD
C
i
R
i
I
inr p
t
inr d
t
on
Operating input voltage
for ≤ 2 s
Nominal input voltage
Input voltage limits
Typical input current
No-load input power
Idle input power
Input capacitance
1
Input resistance
Peak inrush current
Duration of inrush current
Duration of inrush current
Start-up time after removal of shutdown
V
i
=
V
i max,
P
o nom
0 → V
i min,
P
o nom
V
i min,
P
o nom
V
SD
= 0 → 5 V
300
300
3 s without damage
V
i nom,
I
o nom
V
i min
–
V
i max,
I
o
= 0
V
i min
–
V
i max,
V
SD
= 0 V
0
7.3
2.5
2
7
14
20
0.5
500
500
300
300
4
3
Conditions
I
o
= 0 –
I
o max
T
A min
–
T
A max
without shutdown
min
50.4
43.2
72
108
0
4.8
2.5
2
7
14
20
0.5
500
500
ms
4
3
72RCM500-24
typ
(72)
max
90
100.8
min
77
66
110
165
A
W
µF
mΩ
A
110RCM500-24
typ
(110)
max
137.5
154
V
Unit
Table 2b: Input data of RCM1000 models
Input
Characteristics
V
i
V
i 2s
V
i nom
V
i abs
I
i
P
i 0
P
i SD
C
i
R
i
I
inr p
t
inr d
t
on
Operating input voltage
for ≤ 2 s
Nominal input voltage
Input voltage limits
Typical input current
No-load input power
Idle input power
Input capacitance
1
Input resistance
Peak inrush current
Duration of inrush current
Duration of inrush current
Start-up time after removal of shutdown
V
i
=
V
i max,
P
o nom
0 → V
i min,
P
o nom
V
i min,
P
o nom
V
SD
= 0 → 5 V
300
300
3 s without damage
V
i nom,
I
o nom
V
i min
–
V
i max,
I
o
= 0
V
i min
–
V
i max,
V
SD
= 0 V
0
15
3
2.5
7
14
40
0.5
500
500
300
300
4
3
Conditions
I
o
= 0 –
I
o max
T
A min
–
T
A max
without shutdown
min
50.4
43.2
72
108
0
9.5
3
2.5
7
14
40
0.5
500
500
ms
4
3
72RCM1000-24
typ
(72)
max
90
100.8
110RCM1000-24
min
77
66
110
165
A
W
µF
mΩ
A
typ
(110)
max
137.5
154
V
Unit
1
Not smoothed by the inrush current limiter at start-up (for inrush current calculation)
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Page 4 of 17
RCM Series
500 / 1000 W DC-DC Converters
Input Transient and Reverse Polarity Protection
A VDR resistor and a symmetrical input filter form an effective protection against input transients, which typically occur in many
installations, but especially in battery-driven mobile applications.
If the input voltage has the wrong polarity, the incorporated reverse diode will cause the external input circuit breaker or fuse to
trip. With option M or F (incorporated fuse), an active reverse-polarity protection circuit prevents from any damage.
Input Under- / Overvoltage Lockout
If the input voltage is out of range, an internally generated signal disables the converter to avoid any damage.
Efficiency
See fig. 2.
η
[%]
100
90
V
i
= 77 V
80
80
η
[%]
JM216
110RCM500-24DMQ
V
i
= 137 V
110RCM1000-24DMQ
JM215
100
V
i
= 110 V
90
V
i
= 137 V
V
i
= 77 V
70
70
60
0
0.2
0.4
0.6
0.8
P
o
/
P
o nom
60
0
0.2
0.4
0.6
0.8
P
o
/
P
o nom
Fig. 2a
Efficiency versus V
i
and P
o
(110RCM500-24DMQ)
Fig. 2b
Efficiency versus V
i
and P
o
(110RCM1000-24DMQ)
tech.support@psbel.com
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BCD.00803 Rev AC, 10-May-2018
© 2018 Bel Power Solutions & Protection
Page 5 of 17
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