Positron 7715-3 Instrucciones de funcionamiento e instalación
Standalone Power Supply Unit
48 V dc to -24 V dc, 7715-3
Description and Installation
DOCUMENT CONTROL INFORMATION
Document Part Number: 7715-24-03, Rev 4
Document Issue Number: 4
Publication Date: January 07, 2003
Document ID: (o01j1000.fm)
CONFIDENTIALITY NOTICE
The information contained in this document is the property of Positron Inc. Except as specifically
authorized in writing by Positron Inc., the holder of this document: 1) shall keep all information
contained herein confidential and shall protect same in whole or in part from the disclosure and
dissemination to all third parties, and 2) shall use same for operating and maintenance purposes only.
DISCLAIMER NOTICE
Although Positron Inc. has made every effort to ensure the accuracy of the information contained
herein, this document is subject to change without notice.
TECHNICAL CUSTOMER SUPPORT
Should a problem arise, contact your customer support department. If the problem cannot be resolved
by your support department or if you have any questions, contact Positron’s Technical Customer
Support department at 1-888-577-5254.
© 2003 Positron Inc.
Teleline Isolator is a registered trademark of Positron Inc.
Product names, other than Positron’s, mentioned herein may be trademarks and/or registered trademarks
of their respective companies.
Contents i
o01j1000TOC.fm
1. The Standalone Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Hardware Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Mechanical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.1 Wall Mount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.2 Teleline Shelf Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Service and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
(16 pages) Standalone Power Supply Unit, 48 Vdc to -24 Vdc 1
7715-3
o01j1001.fm
1. The Standalone Power Supply Unit
The Standalone Power Supply Unit, model 7715-3 converts floating 48 V dc
from a station battery to -24 V dc referenced to station ground. This large
capacity standalone power supply, can be used to power a fully loaded Three,
Five or Eight-card Shelf. For a view of the Standalone Power Supply Unit, refer
to Figure 1.
The installation kit consists of the Standalone Power Supply Unit, in a durable,
metal enclosure. The kit contains a Description and Installation document,
mounting platform, connecting cables, and mounting hardware.
Attention
This unit cannot be used in conjunction with any other -24 V dc power
supply of the Teleline product line, whether of the standalone or plug-in
variety. For a complete list of incompatible equipment, refer to Table 3.
7715-3
2 Standalone Power Supply Unit, 48 Vdc to -24 Vdc
Figure 1 Model 7715-3
3-7/8"
MOUNTING TRAY
RIGHT SIDE VIEW
16-1/4"
FRONT VIEW
POSITRON # 7715-3 POWER
FAST-BLO
1.5 AMP
MOUNTING
TRAY
INPUT CABLE
9-2/3"
INPUT FUSE
ANCHORING BRACKET
OUTPUT CONNECTOR
Standalone Power Supply Unit, 48 Vdc to -24 Vdc 3
7715-3
Its features include the following:
•The unit may be used with both the old and new generation multi-card
Teleline shelf.
•The unit supplies continuous -24 V dc at up to 2 A from a 48 V dc floating
station battery, without compromising its floating nature.
•The supply uses high-reliability solid state switching technology to perform
the DC to DC conversion.
•The unit’s input is protected against overvoltage transients.
•Two 1½amp input fast-blow fuses protect the power supply against ground
faults and the station battery against a malfunction of the supply. The fuse on
the line input wire is also accessible from the front panel.
•The unit is equipped with a current limiting circuit at its input to prevent an
excessive current surge upon connection of the station battery.
•The unit is equipped with a current limiter at the output for short circuit
protection.
•A green “Power On”LED located on the front panel indicates the presence
of -24 V dc output.
7715-3
4 Standalone Power Supply Unit, 48 Vdc to -24 Vdc
2. Hardware Description
For the unit’s block diagram, refer to Figure 2.
Figure 2 Block Diagram
Overvoltage
Protection
RF Filter Rectifier/
Filter
Smooth
Charge
Circuit
Transformer
Solid
State
Switch
Voltage
Regulator
Timing
48 V dc in
-24 V dc out
(referenced to station ground)
Standalone Power Supply Unit, 48 Vdc to -24 Vdc 5
7715-3
The following is a description of the elements of the Standalone Power Supply
Unit block diagram.
Overvoltage Protection
The Overvoltage Protection is supplied by metal oxide varistors (MOVs) in
metallic and longitudinal configuration that will blow the input fuses in case of
sustained overvoltage at the input.
Smooth Charge Circuit
The Smooth Charge Circuit is a current limiter which limits the charging current
on initial connection to the batteries.
RF Filter
The RF Filter prevents switching noise from the power supply being introduced
onto the power leads.
Solid State Switch
The Solid State Switch is the switching circuit of the switch mode power supply.
Transformer
The Transformer provides 1500 V isolation while stepping down the voltage for
the regulator.
Rectifier/Filter
The Rectifier/Filter circuit rectifies the switching current coming out of the
transformer and charges the capacitor of the filter to produce a DC voltage.
Voltage Regulator
The Voltage Regulator steps down the voltage out of the power supply to a
precise and steady -24 V dc.
Timing
Timing is handled by a timing feedback circuit that monitors the output voltage
and increases or decreases the pulse width of the switch to maintain a controlled
voltage before the regulator.
7715-3
6 Standalone Power Supply Unit, 48 Vdc to -24 Vdc
3. Technical Specifications
For a listing of the unit’s electrical specifications, refer to Table 1. For a listing of
the unit’s physical specifications, refer to Table 2.
Table 1 Electrical Specifications (measured at 77°F or 25°C,
50% R.H.))
Table 2 Physical Specifications
Parameter Specifications
Input station voltage 42 to 56 V dc
Input power at full load 58 W
Nominal output voltage -24 V dc
Maximum output current 2.0 A
Maximum output power 48 W
Output ripple voltage 100 mVpp
Regulation, line <1.0%
Regulation, load <5.0%
Input/output isolation 1500 V @ 60 Hz for 1 minute
Parameter Specifications
Operating temperature range +32°F to +122°F (0°C to + 50°C)
Height 3.9”(9.9 cm)
Width 16.3”(41.4 cm)
Depth 9.7”(24.6 cm)
Weight 6.8 lbs (3.1 kg)
Tabla de contenidos
Otros manuales de Fuente de alimentación de Positron
