COMPLIANCE INFORMATION
UL Listed
C-UL Listed (Canada)
CISPR/EN55022 Class A
48 VDC-to-12 VDC
External Power Supply
FCC Regulations
This equipment has been tested and found to comply with the limits for a class A digital device, pursuant
to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case the user will be
required to correct the interference at the user’s own expense.
SPS-48V
USER’S GUIDE
The TRANSITION Networks SPS-48V 48-to-12 VDC External Power Supply
provides isolated 12 VDC output voltage from a 48 VDC external input voltage
source to a media converter or similar devce.
Canadian Regulations
This digital apparatus does not exceed the Class A limits for radio noise for digital apparatus set out on
the radio interference regulations of the Canadian Department of Communications.
Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables
aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique
édicté par le ministère des Communications du Canada.
European Regulations
Warning
This is a Class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.
Achtung !
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes
Rundfunkstörungen auftreten, in weichen Fällen der Benutzer für entsprechende Gegenmaßnahmen
werantwortlich ist.
Attention !
Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer des
interférences radioélectriques, il appartiendra alors à l’utilsateur de prende les measures spécifiques
appropriées.
Trademark Notice
All registered trademarks and trademarks are the property of their respective owners.
Copyright Restrictions
© 2001 TRANSITION Networks.
All rights reserved. No part of this work may be reproduced or used in any form or by any means –
graphic, electronic, or mechanical – without written permission from TRANSITION Networks.
Installation .................................2
Maintenance ..............................4
Technical Specifications.............6
Compliance Information.............8
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33212.A
Printed in the U.S.A.
4.
5.
6.
Connect +48-VDC terminal to 48-to-12 VDC External Power Supply
terminal block control marked “+”. Turn terminal screw clockwise to
secure.
TECHNICAL SPECIFICATIONS
Input
Connect -48-VDC terminal to 48-to-12 VDC External Power Supply
terminal block control marked “-”. Turn terminal screw clockwise to
secure.
Input Voltage
Inrush Current
Hold-Up Time
48 VDC
0.20 A (peak cold start)
20 msec minimum at full load and nominal input
voltage
Connect ground terminal to 48-to-12 VDC External Power Supply
terminal block control marked “chassis ground”. Turn terminal screw
clockwise to secure.
Isolation Voltage
(Dielectric withstand) Meets IEC 960 for one minute.
1,500 VAC:
500 VAC:
500 VAC:
Output/Input
Input/Safety GND
Output/Safety GND
Output
Output Voltage
Output Current
Line Regulation
Load Regulation
Cross Regulation
12 VDC
0.8 A
±0.5 % of all output within specified range
±1.0 % at 20 % load to full-rated load
±1.0 % maximum on any output change from 50 % to
100 % rated load
+
Transient Response
Output voltage returns in less than 3 msec following a
50 % load change
-
GND
Over Load Protection
(OLP) When the average power rating exceeds 125%-
150% of maximum power, output voltages reduced to
a safe dissipation level; protects against short circuit of
any output.
Over Voltage Protection (OVP) 124 % ±8 % on output.
Over Circuit Protection Withstands a continous short without damage; returns
automatically to regulation upon removal of short.
7.
Ensure that external power source is powered ON.
No Load Operation
No damage to power supply when operating at no
load.
Overshoot Protection
No voltage spike at power-on, power-off, or power
failure.
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6.
7.
Carefully lift cover from External Power Supply.
Locate fuse on 48-VDC Power Supply Module.
MAINTENANCE
Replacing Power Supply Module Fuse
CAUTION: Wear a grounding device and observe electrostatic discharge
precautions when replacing the fuse in the 48-to-12 VDC External Power
Supply. Failure to observe this caution could result in damage to, and
subsequent failure of, the 48-to-12 VDC External Power Supply.
CAUTION: Replace fuse only with same size and rating. Failure to observe this
caution could result in equipment damage.
CAUTION: Ensure that power source is NOT powered when disconnecting
power from, or connecting power to, the 48-to-12 External Power Supply.
Failure to observe this caution could result in damage to, and subsequent
failure of, the 48-to-12 External Power Supply and of any attached device.
1.
2.
Ensure that external power source is powered OFF.
Disconnect +48-VDC terminal from Media Conversion Center terminal
block control marked “+” by turning terminal screw counter-clockwise.
3.
4.
Disconnect -48-VDC terminal from Media Conversion Center terminal
block control marked “-” by turning terminal screw counter-clockwise.
Disconnect ground terminal from Media Conversion Center terminal
block control marked “chassis ground” by turning terminal screw
counter-clockwise.
Fuse Holder
Fuse
5.
Remove and retain four (4) screws that secure cover to External Power
Supply.
8.
9.
Carefully remove fuse from fuse holder.
Install same size and rating replacement fuse in fuse holder.
10. Carefully slide cover onto External Power Supply.
11. Replace four (4) retained screws that secure cover to External Power
Supply.
12. Connect +48-VDC terminal to 48-to-12 VDC External Power Supply
terminal block control marked “+”. Turn terminal screw clockwise to
secure.
13. Connect -48-VDC terminal to 48-to-12 VDC External Power Supply
terminal block control marked “-”. Turn terminal screw clockwise to
secure.
14. Connect ground terminal to 48-to-12 VDC External Power Supply
terminal block control marked “chassis ground”. Turn terminal screw
clockwise to secure.
15. Ensure that external power source is powered ON.
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