> Description
The PMR series is a range of cost effective, medium power converters that comply fully with
the latest rail specifications and norms for protection and EMC. They can be used individually
or paralleled to create dual redundant or N+1 redundant systems, or simply to provide higher
power capability. Although simple in construction, the mounting arrangement ensures
compliance with shock and vibration requirements of EN50155.
Special features include:
• High efficiency
• Wide choice of input and output voltages
• Output series device
• Active current share fitted as standard
• Conduction cooled or convection only cooled models available
• Fully compliant with Rail standards, EN50155, EN50121.3.2
> Input Specifications
The following input voltages versions are available as standard:
110V (66.0 - 137.5V) dc (Suffix A)
72V (43.2 - 90.0V) dc (Suffix D)
52V (31.2 - 65.0V) dc (Suffix C)
36V (21.0 - 50.4V) dc (Suffix F)
24V (16.8 - 33.6V) dc (Suffix B)
Other ranges are available to order
Parameter Detail
Input Ripple To EN50155
Input Protection Reverse polarity protection (series device)
Surges and transients EN50155 (direct and indirect)
Inrush Current Active protection limits inrush to 6 x nominal current (after
0.1ms). (Except 24V input version)
Efficiency 88% typical
Hold up time 10ms to EN50155 Class S2.
For Suffix B & F units (24V & 36V input versions): hold up is
at a reduced load of 90%.
> Output Specifications
Parameter Detail
Maximum Output Power
500W (24V input - 400W maximum)
Output Versions
Single output only
Output Voltage
Can be specified from 12V to 50V
Setting Tolerance
±1.0% at 50% load, 15°C to 25°C
Minimum Load
Zero
Line Regulation
±0.5%
Load Regulation
±0.5%
Remote sensing
Compensates for up to 250mV drop in each load line (for
outputs between 12V & 24V).
Temperature Coefficient
<0.02% / °C
Output Ripple
<1% Pk-Pk of Output Voltage
Output Noise
<75mV Pk-Pk superimposed (up to 20MHz)
Response Time
0.5ms to within 2% (for a 10% - 100% load change)
Current limit
Operates at approximately 110% - 130% of rated
output current, stop & retry
Thermal Protection
Shuts down PSU if safe internal temperature is exceeded.
Auto recovery.
500W POWERTRON
®
PMR SERIES
DC/DC CONVERTER FOR RAILWAY APPLICATIONS
www.martekpower.com
>>> September 2010
Over-voltage Protection
Operates if output exceeds 115% (
±5%) of nominal.
Reset by power-down, power-up sequence
Output Good Indication Green LED confirms output present
Output Good Signal Volt-free relay contacts (changeover)
Parallel Operation Two or more converters may be connected in parallel for dual
redundant or N+1 operation, or higher system power capability.
Output Series Device Prevents failure of one converter from affecting operation of others
connected in parallel. Implemented using low loss device for
maximum efficiency.
Current Sharing Active current sharing ensures that two or more supplies connected
in parallel share the load current to better than 60% / 40%.
One interconnection between supplies required.
Isolation
Input to Output 1.0kV ac (tested at 1.4kV dc)
Input to Case 1.0kV ac (tested at 1.4kV dc)
Output to Case 1.0kV ac (tested at 1.4kV dc)
> Environmental Details
Parameter Detail
Operating Temperature
-40°C to +55°C (70°C for 10 min.)
Storage Temperature -55°C to +80°C
Cooling
Alternative models for convection only cooling or conduction & con-
vection cooling. For cold wall (conduction) cooling, base plate
temperature should not exceed 85°C.
Relative Humidity 95% max.
Shock & Vibration EN51055 (EN61373)
Environmental Protection
IP20
> Applicable Norms
Parameter Detail
EMC
EN50155 (2007), EN50121-3-2 (2006)
Other
EN50155 (2007)
> Mechanical Characteristics
Parameter Detail
Construction Simple aluminium chassis
Dimensions
(Length x Width x Height)
Conduction / convection Convection cooled
cooled (option H)
L 250mm 250mm
W 158mm 158mm
H 70mm 112mm
(Note: width includes mounting flanges)
Weight
1.6kg 3.2kg
Connections
Wago 236-501 terminal blocks as standard. M5 earth stud.
Fixings
6x12mm slot on base, four positions. M5 earth stud.
Option Detail
Connections Power D types
Code
Q1
Cooling Heat sink fitted H
www.martekpower.com
Glebe Farm Technical Campus Knapwell Cambridge CB23 4GG UK Tel. +44 (0) 1954 267726 Fax. + 44 (0) 1954 267626 sales@martekpower.co.uk
>>> September 2010