Alpha MPS48-7M User Manual

Technical Manual

MPS48-7M

Effective: August 2007

Alpha Technologies

Alpha Technologies

Power

®

MPS48-7M

Technical Manual

021-511-B4-002, Rev. B

Effective Date: August 2007

Copyright© 2007

Alpha Technologies, Inc.

member of The Group

NOTE:

Photographs contained in this manual are for illustrative purposes only. These photographs may not match
your installation.

NOTE:

Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If
there are questions regarding the safe operation of this product, please contact Alpha Technologies or your
nearest Alpha representative.

NOTE:

Alpha shall not be held liable for any damage or injury involving its enclosures, power supplies, generators,
batteries, or other hardware if used or operated in any manner or subject to any condition not consistent with
its intended purpose, or is installed or operated in an unapproved manner, or improperly maintained.

Notice of FCC Compliance

Per FCC 47 CFR 15.21:

Changes or modifi cations not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.

Per FCC 47 CFR 15.105:

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.

TM

Contacting Alpha Technologies: www.alpha.com

or

For general product information and customer service (7 AM to 5 PM, Pacifi c Time), call

1-800-863-3930

For complete technical support, call

1-800-863-3364

7 AM to 5 PM, Pacifi c Time or 24/7 emergency support

To report errors in this manual, send email to [e-mail]

3

Contents

Safety Notes .......................................................................................................................... 6

1.0 Introduction ...............................................................................................................10

2.0 Theory of Operation ...................................................................................................11

3.0 Specifi cations............................................................................................................ 12

4.0 Installation.................................................................................................................14

4.1 Unpacking the MPS48-7M ............................................................................. 14

4.2 Enclosure Installation, Wall-mount or Wooden Pole-mount ........................... 14

4.3 Enclosure Installation, Steel or Concrete Pole...............................................16

4.4 AC Input (120/240Vac) Connection Procedure .............................................. 17

4.5 AC Connection with High Voltage Transformer..............................................18

4.5.1 Installing the Transformer....................................................................18

4.5.2 Installing the Streetlight AC Power Tap Cable ..................................... 19

4.6 Network Cable Connection Procedure........................................................... 20

4.7 Battery Connection Procedure .......................................................................21

4.8 Network Connections .....................................................................................21

5.0 Operation ..................................................................................................................22

5.1 Start-up .......................................................................................................... 22

5.2 Normal Operation........................................................................................... 22

5.3 Battery Backup Mode..................................................................................... 23

5.4 Charging Mode .............................................................................................. 23

6.0 Troubleshooting ........................................................................................................ 24

6.1 Troubleshooting Table .................................................................................... 24

6.2 Connecting to the Local Craft Port .................................................................24

7.0 Maintenance ............................................................................................................. 25

7.1 Battery Replacement ..................................................................................... 25

7.2 Replacing the Power Module ......................................................................... 25

7.3 Battery Management...................................................................................... 26

4 021-511-B4-002, Rev. B

List of Figures and Tables

Fig. 1-1, MPS48-7M Overview ............................................................................................ 10

Fig. 3-1, MPS48-7M Enclosure Dimensions........................................................................ 13

Fig. 4-1, AC Connections.....................................................................................................17

Fig. 4-2, Input Voltage Select Switch ................................................................................... 17

Fig. 4-3, Streetlight AC Power Tap Cable Stripped .............................................................. 19

Fig. 4-4, Streetlight AC Power Tap Cable Installed .............................................................. 19

Fig. 4-5, Strain Relief Fitting ................................................................................................20

Fig. 4-6, Customer Connections ..........................................................................................20

Fig. 5-1, Status LEDs ..........................................................................................................22

Fig. 5-2, Battery Capacity Versus Temperature ................................................................... 23

Fig. 7-1, Battery Capacity Characteristics ........................................................................... 26

Table 2-1, Network Connections...........................................................................................11

Table 5-1, Status LED Indications .......................................................................................22

Table 5-2, Battery Runtime and Recharge Times ................................................................ 23

5021-511-B4-002, Rev. B

Safety Notes

Review the drawings and illustrations in this manual before proceeding. If there are any questions
regarding the safe installation or operation of this product, contact Alpha Technologies or the nearest Alpha
representative. Save this document for future reference.

To reduce the risk of injury or death, and to ensure the continued safe operation of this product, the following
symbols have been placed throughout this manual. Where these symbols appear, use extra care and
attention.

ATTENTION:

The use of ATTENTION indicates specifi c regulatory/code requirements that may affect the placement of
equipment and /or installation procedures.

NOTE:

A NOTE provide additional information to help complete a specifi c task or procedure.

CAUTION!

The use of CAUTION indicates safety information intended to PREVENT DAMAGE to material or
equipment.

WARNING!

WARNING presents safety information to PREVENT INJURY OR DEATH to the technician
or user.

6 021-511-B4-002, Rev. B

General Safety Precautions

To avoid injury:

• This enclosure and its hardware must only be serviced by authorized personnel.

• The enclosure must remain locked at all times, except when authorized service personnel are present.

• Remove all conductive jewelry or personal equipment prior to servicing equipment, parts, connectors,
wiring, or batteries.

• Read and follow all installation, equipment grounding, usage, and service instructions included in this
manual.

• Use proper lifting techniques whenever handling enclosure, equipment, parts, or batteries.

• Batteries contain dangerous voltages, currents and corrosive material. Battery installation, maintenance,
service and replacement must only be performed by authorized personnel.

• Never use uninsulated tools or other conductive materials when installing, maintaining, servicing or
replacing batteries.

• Use special caution when connecting or adjusting battery cabling. An improperly connected battery cable
or an unconnected battery cable can result in arcing, fi re, or possible explosion.

• Avoid any contact with gelled or liquid emissions from valve-regulated lead-acid (VRLA) batteries.
Emissions contain dilute sulfuric acid that is harmful to the skin and eyes. Emissions are electrolytic, and
are electrically conductive and are corrosive. Follow the Chemical Hazards notes if contact occurs.

• Do not smoke or introduce sparks in the vicinity of a battery.

• Under certain overcharging conditions, lead-acid batteries can vent a mixture of hydrogen gas that is
explosive. Proper venting of the enclosure is required.

• Follow the battery manufacturer’s approved transportation and storage instructions.

To avoid damage:

• Prior to installation, verify the AC input voltage and frequency matches the rating of to the enclosure and
its equipment.

• Prior to installation, verify that the output voltage from the enclosure or its equipment match the voltage
requirements of the connected equipment (load).

• Prior to installation, verify that the enclosure’s utility service panel is equipped with a properly rated circuit
breaker for use with the equipment inside. Refer to manufacturer’s recommendations.

• Review and upgrade utility service panel circuit breaker requirements whenever equipment is changed.

• Prior to installation, contact local utilities, building maintenance departments, and cable/piping locator
services to ensure that installation does not interfere with existing utility cables or piping.

• Do not exceed the output rating of equipment. Verify load requirements prior and during connection
process.

• Prior to handling the batteries, touch a grounded metal object to dissipate any static charge that may have
developed in your body.

7021-511-B4-002, Rev. B

Battery Safety Notes

WARNING!

Lead-acid batteries contain dangerous voltages, currents, and corrosive material. Battery
installation, maintenance, service, and replacement must be performed only by authorized
personnel.

Chemical Hazards

Any gelled or liquid emissions from a valve-regulated lead-acid (VRLA) battery contain dilute sulfuric
acid, which is harmful to the skin and eyes. Emissions are electrolytic, and are electrically conductive and
corrosive.

To avoid injury:

• Servicing and connection of batteries shall be performed by, or under the direct supervision of, personnel
knowledgeable of batteries and the required safety precautions.

• Always wear eye protection, rubber gloves, and a protective vest when working near batteries. Remove
all metallic objects from hands and neck.

• Batteries can produce explosive gases. Keep all open fl ames and sparks away from batteries.

• Use tools with insulated handles. Do not rest tools on top of batteries.

• Batteries contain or emit chemicals known to the State of California to cause cancer and birth defects
or other reproductive harm. Battery post terminals and related accessories contain lead and lead
compounds. Wash hands after handling (California Proposition 65).

• Wear protective clothing (insulated gloves, eye protection, etc.) whenever installing, maintaining,
servicing, or replacing batteries.

• If any battery emission contacts the skin, wash immediately and thoroughly with water. Follow your
company’s approved chemical exposure procedures.

• Neutralize any spilled battery emission with the solution contained in an approved spill kit, or with a

solution of one pound Bicarbonate of soda to one gallon of water. Report chemical spill using your
company’s spill reporting structure and seek medical attention if necessary.

• All battery compartments must have adequate ventilation to prevent an accumulation of potentially

dangerous gas.

• Prior to handling the batteries, touch a grounded metal object to dissipate any static charge that may have

developed on your body.

• Never use uninsulated tools or other conductive materials when installing, maintaining, servicing or

replacing batteries.

• Use special caution when connecting or adjusting battery cabling. An improperly connected battery cable

or an unconnected battery cable can make contact with an unintended surface that can result in arcing,
fi re, or possible explosion.

• A battery showing signs of cracking, leaking, or swelling should be replaced immediately by authorized
personnel using a battery of identical type and rating.

8 021-511-B4-002, Rev. B

Battery Maintenance Guidelines

The battery maintenance instructions listed below are for reference only. Battery manufacturer’s instructions
for transportation, installation, storage or maintenance take precedence over these instructions.

• Inspect batteries every 6 months for:
Signs of battery cracking, leaking or swelling. The battery should be replaced immediately by

authorized personnel using a battery of the identical type and rating.

• Apply battery manufacturer’s specifi ed antioxidant compound on all exposed connections.

• Clean up any electrolyte (battery emission) in accordance with all federal, state, and local regulations or

codes.

• Always replace batteries with those of an identical type and rating. Never install old or untested batteries.

• All battery compartments must have adequate ventilation to prevent an accumulation of potentially

dangerous gas.

Recycling and Disposal Instructions

Spent or damaged batteries are considered environmentally unsafe. Always recycle used batteries or dispose
of the batteries in accordance with all federal, state and local regulations.

Electrical Safety

• Lethal voltages are present within the power supply and electrical boxes. Never assume that an electrical

connection or conductor is not energized. Check the circuit with a voltmeter with respect to the grounded
portion of the enclosure (both AC and DC) prior to any installation or removal procedure.

• Always use the buddy system when working under hazardous conditions.

• A licensed electrician is required to install permanently wired equipment.

• Input voltages can range up to 347Vac. Ensure that utility power is disabled before beginning installation

or removal.

• Ensure no liquids or wet clothes contact internal components.

• Hazardous electrically live parts inside this unit are energized from batteries even when the AC input

power is disconnected.

Mechanical Safety

• Power supplies can reach extreme temperatures under load.

• Use caution around sheet metal components and sharp edges.

9021-511-B4-002, Rev. B

1.0 Introduction

Alpha’s FlexNet MPS48-7M multipurpose power supply provides primary and standby power to
Wi-Fi radios in wall-mount and pole-mount applications. The MPS48-7M interface module includes
connections for radio, Ethernet backhaul, local Craft port, and 48Vdc auxiliary connection.

The MPS48-7M is supported by a full complement of options including batteries, 120Vac or 240Vac
battery heater mat, 120Vac line cord, and a step-down transformer for high voltage streetlight
applications.

Key Features:

• Rugged 48Vdc indoor or outdoor UPS

• Multi-use mounting bracket for wall-mount and pole-mount applications

• Temperature compensated battery charging for optimum battery life

• Local and remote status monitoring and reporting

• Battery heater provides extended runtimes in cold conditions

• Preconnectorized cables minimize installation time and eliminate errors

Input Power

Voltage Select

Customer-supplied

Cables

Status LEDs

Power Module

AC Input Connector

Battery Heater Mat

Connector

Battery Shelf

Input Power

Terminal Block

Internal Ground Stud

Power Interface

Module

Battery Temperature

Sensor

Battery Cable

Battery Retaining

Bracket

Network Connections

(3/4" EMT Knockout)

1/2" EMT Knockout

(optional use)

AC Input

(1/2" EMT Knockout)

Fig. 1-1, MPS48-7M Overview

10 021-511-B4-002, Rev. B

2.0 Theory of Operation

The FlexNet MPS48-7M multipurpose power supply provides fi ltered 50W output power for a typical
48V telecom bus during normal line operation. During line disruptions, the MPS48-7M supplies
uninterrupted output power of 50W directly from a string of four 12V batteries.

Metal oxide varistor (MOV) technology provides line voltage surge suppression in the event of line
cross or power spikes. An electromagnetic fi lter conditions line voltage, enabling the power supply
to operate in compliance with FCC Class A standards. The AC-to-DC converter feeds power to the
primary winding of a high-frequency isolation transformer. The resulting DC output, at the secondary
of the transformer, provides power to the load and charges the 48V string batteries, keeping them
fully charged in preparation for a line disruption. MPS48-7M battery temperature compensation range
is from -0ºC to 40ºC. A battery heater mat option extends battery life in cold environments. Maximum
output voltage of 56Vdc.

The power module provides over-current, over-voltage, and short-circuit protection. After the fault
is cleared, the power module automatically resumes power to the load. The control logic circuitry
provides a LVD (low battery voltage disconnect), detects the presence (or absence) of batteries,
performs periodic battery testing, and communicates status locally with LED status indicators.

Preconnectorized cables of varying lengths provide reliable and effi cient fi eld installation. Ethernet,
48Vdc power (with return), and RS232 interface are supported on the preconnectorized cables.

The MPS housing is constructed of weather resistant powder coated aluminum. The enclosure can be
pole or wall-mounted.

AC service is routed into the bottom of the enclosure through a 1/2" Electrical Metallic Tubing (EMT)
knockout located in the bottom center of the enclosure. The data and power cables are routed
through a provided 3-hole strain relief fi tting. Additional 1/2" and 3/4" knockouts are provided at the
back, bottom, and sides of the enclosure.

The MPS48-7M interface module includes:

• An RJ11/RJ45 pair of connections support a mesh router. The RJ11 includes the RS232
connection to the router. The RJ45 provides an Ethernet connection between the router and
48VDC power (and return).

• An RJ45 for connection to a remote router or modem (Ethernet backhaul).

• An RJ11 Craft Port connection providing an RS232 connection to the mesh router for network
management information.

• A 48Vdc terminal block for an auxiliary piece of equipment (e.g. a camera).

Aux Radio,

Power

Terminal Block RJ45 RJ45 RJ11 RJ11
Pin Pin Pin Pin Pin

1 +48Vdc 1 Data

Pair 1

2 Return 2 Data

Pair 1
3 Data
Pair 2
4 +Vdc 4 NC 4 Radio RX 4 Local TX
5 +Vdc 5 NC 5 NC 5 NC
6 Data
Pair 2
7 - Vdc 7 NC
8 - Vdc 8 NC

Ethernet

Backhaul

1 Data Pair 1 1 NC 1 NC
2 Data Pair 1 2 Radio TX 2 Local RX
3 Data Pair 2 3 Return 3 Return

6 Data Pair 2 6 NC 6 NC

Radio, Serial Local Craft

Table 2-1, Network Connections

11021-511-B4-002, Rev. B

3.0 Specifi cations

Input

Voltage Range (switch selectable)
Frequency 47Hz or 63Hz
Surge Protection

Output

Operating Output Power 50W continuous, 70W max (10 seconds)
Output Voltage 42 to 56Vdc
Ripple <250mVrms
Noise <2Vp-p
Transfer Characteristics Uninterrupted output

Battery

Type
Temperature Storage:-4ºF to 104ºF (-20ºC to 40ºC), Charge:-10ºF to 140ºF (-23ºC to 60ºC)*

Capacity 7.2Ah @ 20 hour rate to 1.75Vdc (per cell)**
Weight (lb/kg) 5.95 / 2.7
Dimensions (in/mm) 5.94H x 2.56W x 3.86D / 151H x 65W x 98D
Runtime:

LED Indicators

Output Okay Green, Solid
Standby Operation Green, Blinking
Low/Missing Battery Red, Blinking
Replace Battery Red, Solid
Overload Red and Green, Blinking

Mechanical

Dimensions (in/mm) 17.5H x 12.75W x 5.25D / 445H x 324W x 133D
Weight, without batteries (lb/kg) 11 / 4.9

Environmental

Operating Temperature (with heater) -40ºF to 131ºF (-40ºC to 55°C)
Operating Temperature (without heater) -4ºF to 131ºF (-20ºC to 55ºC)
Storage Temperature -58ºF to 158ºF (-50°C to 70°C)
Humidity 0 to 95% non condensing
* Length of storage will determine the need for supplemental charge, especially if stored at higher temperatures.

** Extended exposure to temperatures > 104ºF (40°C) may shorten battery life.

Mounting Confi guration

Wall-mount or pole-mount

Agency Compliance

FCC part 15 Class A
CSA-NRTL\C (UL/CSA 60950-1:2007)
CE (IEC 60950-1:2001, EN 61204-3:2000-11)
RoHS compliant, per European Union’s Directive 2002/95/EC, Restrictions of Hazardous Substances
Zone 4, per GR-63 (requires suitable mounting surface)
NEMA 3R, designed to meet IPX5 Water Intrusion Criteria, per IEC 60529

Standard Features

No audible noise
Reverse battery polarity protection

90-132Vac (low range) or 180-264Vac (high range), 250 to 347Vac with optional
step-down transformer

ANSI/IEEE Std. C62.41 to Category A, B, or C requirements, using a “Ring W ave”
or “Combination” waveform, at a level of 6kV

Four sealed 12Vdc valve-regulated lead-acid, maintenance free, immobilized
electrolyte (sold separately)

See Table 5-2

12 021-511-B4-002, Rev. B

3.0 Specifi cations, continued

12.4" (315mm)

3.5" (89mm)

12.8" (325mm)

0.380" (10mm) dia.

0.395" (10mm) dia.

17.4" (442mm)

6.7" (170mm)

5.2" (132mm)

2.0" (51mm)

14.0" (356mm)

17.0" (432mm)

10.0" (254mm)

Fig. 3-1, MPS48-7M Enclosure Dimensions

Spare Parts and Options

Part Number Product Name

189-078-20 Battery Heater for the MPS48-7M, 240Vac
189-078-21 Battery Heater for the MPS48-7M, 120Vac
745-866-20 Mounting Bracket with Hardware (included)
745-863-20 AC Line Cord, 5-15P, 8'
745-850-22 Transformer Kit, 277Vac Step-Down to 240Vac
243-119-19 Transformer Kit, 347Vac Step-down to 240Vac
875-580-10 Cable, UPS, Streetlight AC PWR Tap Cable, 2-Con w/GND Lug and Wire, 25'
650-264-10 3/4" 3-hole Strain Relief Fitting
650-225-10 1/2" Strain Relief Fitting
181-036-10 7.2Ah AGM Battery with 1-year warranty
181-063-10 7.2Ah AGM Battery with 3-year warranty

13021-511-B4-002, Rev. B

4.0 Installation

4.1 Unpacking the MPS48-7M

Remove the mounting bracket and enclosure from the
shipping carton. Inspect the MPS48-7M for shipping
damage.

Verify each carton contains:

• MPS48-7M enclosure

• Mounting bracket and hardware

• 3/4" 3-hole strain relief fi tting

• 1/2" strain relief fi tting

• Cable ties

• Quick Start Guide

4.2 Enclosure Installation, Wall-mount or Wooden Pole-mount

Most codes require the base of the enclosure to be located a minimum height from the
ground. Always verify height restrictions before installation.

ATTENTION:

Before installing an enclosure, the location and method of mounting must be approved by the property owner.

Recommended Tools and Materials:

• Ratchet with 7/16" socket

• Level

• Phillips screwdriver

• Two user-supplied 1/4" x 2-1/2" (7mm x 60mm) lag bolts with fl at washers

• Stud fi nder (optional)

Installation Procedure:

1. Remove the mounting hardware from the inside of the bracket

and position the bracket on a wall or wooden pole capable of
supporting 35 lb. (16kg). Use a backing plate if necessary.

2. Level the bracket vertically with the tab facing up.

Tab

Lag Bolt

3. Secure the bracket to the wall or pole using two user-supplied

1/4" x 2-1/2" lag bolts. The hardware must sit fl ush inside the
bracket dimples for proper installation.

Lag Bolt

14 021-511-B4-002, Rev. B

4.0 Installation, continued

4.2 Enclosure Installation, Wall-mount or Wooden Pole Mount, continued

4. Hang the enclosure on the bracket.

5. Secure the enclosure to the bracket using the
four self-tapping screws with washers (supplied).

Proceed to Section 4.4.

15021-511-B4-002, Rev. B

4.0 Installation, continued

4.3 Enclosure Installation, Steel or Concrete Pole

To mount the MPS48-7M on concrete or steel poles, two user-supplied mounting straps
are required (straps must be stainless, galvanized, or equivalent). Most codes require the
base of the enclosure to be located a minimum height from the ground. Always verify height
restrictions before installation.

ATTENTION:

Before installing an enclosure, the location and method of mounting must be approved by the property owner.

Required Tools and Materials:

• #2 Phillips screwdriver

• Two user-supplied pole straps to fi t pole (straps must be
stainless, galvanized or equivalent)

Installation Procedure:

1. Position the bracket at the appropriate height with the tab
facing up. Secure it to the pole using the pole straps.

Tab

2. Hang the enclosure on the bracket.

3. Secure the enclosure to the bracket using the four self­tapping screws with washers (supplied).

16 021-511-B4-002, Rev. B

4.0 Installation, continued

4.4 AC Input (120/240Vac) Connection Procedure

Required Tools and Materials:

• Hammer with punch or screwdriver

• 1" Open-end wrench

• Channellock pliers

• 11/32" (9mm) torque wrench or nut driver

• #1 fl athead torque screwdriver

ATTENTION:

The user or installer must provide an accessible system disconnect device located near the power supply
enclosure as required by local electrical codes, and an over-current protection device with a maximum rating
of 20A, or as required by local electrical codes.

1. Verify utility power is OFF. Tag and lock utility power switch.

2. Remove the 1/2" EMT knockout (7/8" dia.)

and the 3/4" EMT knockout (1 1/8" dia.),
located in the center bottom of the enclosure.
For alternate installation, remove knockouts
from the right side, left side, or back left of the
enclosure as needed.

3. Install the provided 1/2" strain relief fi tting, or

user-supplied 1/2" Electrical Metallic Tubing
(EMT), in the front 1/2" knockout. Route the
line cord, or #18AWG wire for line, neutral,
and ground, between the enclosure and utility power connection. When installing the
strain relief fi tting, run the line cord or AC wiring through the outer nut before installing the
rest of the fi tting. See Fig. 4-1.

4. For 120V applications: connect the line and neutral wires to the AC input block. Torque

to 4.5 in-lbs (.5 N m).

For 240V applications: connect L1 and L2 wires to the AC input block. Torque to 4.5

in-lbs (.5 N m).

5. Connect the ground wire (green) to the #10 ground stud. Torque to 36 in-lbs (4.1 N m).

6. Tighten the strain relief fi tting using Channellock pliers and a 1" wrench.

7. For 120V applications, remove the protective label on the input voltage select switch, and

move the switch to the 120V position. See Fig. 4-2.

Up for

120V

3/4" Knockout
1/2" Knockout

Fig. 4-1, AC Connections

Outer Nut

Fig. 4-2, Input Voltage Select Switch

17021-511-B4-002, Rev. B

4.0 Installation, continued

4.5 AC Connection with High Voltage Transformer

The transformer converts high voltage to 240Vac. The transformer is required for powering
the MPS48-7M from high voltage light pole applications. Use the following connection
procedures for installing the transformer kit.

Required Tools and Materials:

• #2 Phillips screwdriver

• #1 fl athead screwdriver (torque drive)

• Diagonal cutters

CAUTION!
Never apply high voltage to a unit without using a step-down transformer. Applying high voltage to

the unit without the transformer will damage the unit and void the warranty.

4.5.1 Installing the Transformer

1. Verify power is OFF at utility. Tag and lock
utility power switch.

2. Cut the plastic ties securing standard AC
input wire kit that connects the AC input
block to the AC input connector on the
power module. Remove the standard wire
kit.

3. Locate the two countersunk holes located
on the battery shelf. Mount the transformer
onto the shelf using the supplied fl athead
screws (2) and Keps nuts (2).

4. Connect the short red wire from the
transformer to the L1 terminal on the AC
input block. Torque to 4.5 in-lbs (.5 N m).

5. Connect the short white wire from the
transformer to the L2 terminal on the AC
input block. Torque to 4.5 in-lbs (.5 N m).

6. Connect the green 3-pin connector from the
transformer to the AC input connector on
the power module.

7. Secure the new wiring with cable ties.

AC Input

Connector

Cable

Tie

Cable

Tie

18 021-511-B4-002, Rev. B

4.0 Installation, continued

4.5 AC Connection with High Voltage Transformer, continued

4.5.2 Installing the Streetlight AC Power Tap Cable

1. Remove the 1/2" EMT knockout (7/8" dia.) and the 3/4" EMT knockout (1 1/8" dia.),
located in the center bottom of the enclosure. For alternate installation, remove
knockouts from the right side, left side or back left of the enclosure as needed.

2. Install the provided 1/2" strain relief fi tting
in the 1/2" knockout. Route the Streetlight
AC Power Tap Cable and separate
12AWG safety ground wire between the
enclosure and utility power connection.
Connect the terminal end of the safety
ground.

3. Remove two inches of the outer insulation
from the Streetlight AC Power Tap Cable,
and strip the white and black wires 1/4". See Fig. 4-3.

4. Connect the black wire to the L1 terminal on the AC input block. See Fig. 4-4.

5. Connect the white wire to the L2/N terminal on the AC input block.

3/4" Knockout

1/2" Knockout

6. Connect a safety ground using a #10 ring lug (for #18AWG wire) to the #10 ground stud
located on the back wall of the enclosure. Torque to 36 in-lbs (4.1 N m).

Do not connect AC power at this time; continue to Section 4.6.

Strip 1/4"

Strip 2"

(outer insulation)

Fig. 4-3, Streetlight AC Power Tap Cable Stripped Fig. 4-4, Streetlight AC Power Tap Cable Installed

19021-511-B4-002, Rev. B

4.0 Installation, continued

4.6 Network Cable Connection Procedure

Required Tools and Materials:

Channellock pliers

1. Remove the white seal from the 3-hole strain relief
fi tting, and install the base of the fi tting into the 3/4"
knockout. Secure the top inside nut.

2. Route the customer-supplied connection cables into the enclosure
through the outer nut and base.

3. Route the Ethernet cable and auxiliary wiring (if applicable) from inside the enclosure,
down through the 3-hole strain relief fi tting.

4. Insert the cables into the splits in the seal, leaving about 20" for routing into the
enclosure. The seal is split in three places to accommodate the cabling. See Fig. 4-5.

5. Replace the seal into the base.

6. Secure the outer nut.

7. Make connections to the RADIO, POWER and RADIO, SERIAL connectors. Connect
Ethernet cable to the ETHERNET BACKHAUL connector. Connect auxiliary equipment to
AUX connector (if applicable). See Fig. 4-6.

Network Cable

(optional)

8. Plug any unused ports in the seal (use a short section of wire, or other available

9. Proceed to battery connection procedure. Do Not connect AC power at this time.

Splits indicated

by dashed lines

Fig. 4-5, 3-hole Strain Relief Fitting

material).

Base

Seal

Outer Nut

Fig. 4-6, Network Connections

20 021-511-B4-002, Rev. B

4.0 Installation, continued

4.7 Battery Connection Procedure

Required Tools and Materials:

• #2 fl athead screwdriver

• Electrical tape

1. Loosen the retaining screw on the battery retaining bracket and move the bracket clear of

the battery shelf.

2. If using the battery heater mat option, verify the input voltage printed on the battery

heater mat label corresponds to the selected input voltage (default 240V). Place the
battery heater mat on the shelf. Connect the 3-pin connector to the Battery Heater
connection on the power module.

CAUTION!
Connecting 240Vac to a battery heater mat rated 120Vac will damage the heater mat.

3. Place two 7.2Ah batteries on the battery shelf and

tape the battery temperature sensor to the side of the
second battery. Place the remaining two batteries on
the battery shelf.

4. Replace the battery retaining bracket and secure.

5. Connect the batteries, leaving the far left negative

terminal unconnected. The positive battery connections
are fi tted with a safety tab to prevent misconnection.

4.8 Network Connections

Tape Sensor to Battery

Leave Disconnected

Make network connections and complete any other connections on the customer and service
AC side at this time. When all connections are verifi ed proceed to Section 5.0, Operation.

21021-511-B4-002, Rev. B

5.0 Operation

5.1 Start-up

1. Verify the input voltage select switch on the power module is set for the correct input
voltage. The factory default setting is 240Vac.

CAUTION!

Incorrect voltage selection can damage the unit and void the warranty. Verify the input
voltage select switch matches applied AC input power. Never apply 240Vac to a unit with
the input voltage select switch in the 120Vac position.

2. Verify customer-end connections and apply AC power to the unit.

3. Connect the battery terminal left unplugged in Section 4.7.

5.2 Normal Operation

The green status LED will be ON solid after the battery connection is made. If any other
indication is present, see Section 6.0 for troubleshooting. Operating status of the MPS48-7M
is indicated by two status LEDs located on the power module. Refer to Table 5-1 to determine
operational status and possible faults.

Status LEDs

Fig. 5-1, Status LEDs

LED Color State Indication

Green Solid Output OK
Green Blinking Standby Operation

Red Blinking Battery Low/Missing
Red Solid Replace Battery

Red & Green Blinking Overload

Table 5-1, Status LED Indications

NOTE:

When an Overload alarm and Battery Low/Missing alarm are present simultaneously, the Overload alarm will
take precedence.

22 021-511-B4-002, Rev. B

5.0 Operation

0

20

40

60

80

100

120

-40°F
(-40°C)

-20°F
(-29°C)

0°F
(-18°C)

20°F
(-7°C)

40°F
(4°C)

60°F
(16°C)

80°F
(27°C)

100°F
(38°C)

Ambient Air Temperature

Battery Capacity (%)

5.3 Battery Backup Mode

In the event of an AC power outage, the MPS48-7M switches to battery backup mode to
power the load. The green status LED begins to blink, indicating the load is being powered
from the battery string. The MPS48-7M runs in battery backup mode until AC power is
restored, or until the battery string reach a low-voltage shutdown level of 42V. On resumption
of AC power, the MPS48-7M recharges the batteries at a maximum current of 1.8A.

5.4 Charging Mode

Under normal conditions, a fl oat charge maintains the batteries at 100% capacity. In the
event of line failure, battery charging resumes automatically when primary power is restored.
Charging continues until one of the following occurs:

• Battery has reached 100% of capacity.

• Another power failure occurs requiring battery support. Charging ceases until primary

• Additional power is required by the load, in which case power is diverted from the battery

power is restored.

charger and sent to the load. When demand for additional power ceases, normal battery
charging resumes.

Battery Capacity (%) vs. Temperature

withoutheatermat

*This chart is an approximation of the effectiveness of a heater verse no heater.

withheatermat

Fig. 5-2, Battery Capacity Versus Temperature

Runtime (hours) vs Temperature Typical Recharge time vs Load

Load -40°C 0°C 25°C 40°C

20Watts 12.5 13.4 16.0 20 13 hr
40Watts 6.0 6.3 7.6 10 25 hr
50Watts 3.3 4.1 5.7 7.2 50 hr

Table 5-2, Battery Runtime and Recharge Times

23021-511-B4-002, Rev. B

6.0 Troubleshooting

6.1 Troubleshooting Table

Fault Corrective Action

Green LED is blinking after
initial startup

Red LED is ON solid Replace batteries.
Red LED is blinking If no batteries are missing, check battery connections. Check

Both red and green LEDs are
blinking

Low battery runtime in cold
weather

Battery heater mat does not
heat

Power module fails to come on
after applying 240V with the
voltage select switch set for
120V

No power to the customer
connections (radio)

Troubleshooting Table

Verify AC power is ON. Check voltage at AC input block. Check
AC input connector on power module.

battery string connector on power module.
Possible overload condition. Verify load does not exceed rated

capacity of power supply.
Verify the battery heater mat is warming. Use compressed air to

lower temperature. Heater should come on at 32°F (0°C). Check
battery heater mat connection. If battery heater mat fails to come
on, replace it.

Verify the ambient temperature is below 32ºF. Verify the voltage
input rating on the battery heater mat matches the input voltage
select switch. Units set to 120V will not heat battery heater mats
rated for 240V. Units set to 240V will damage battery heater mats
rated for 120V input.

Check the input voltage select switch. The power module can be
damaged by applying 240Vac to the unit when the input voltage
select switch is set to 120Vac. If the power module fails to
function after this fault, it must be replaced.

Verify the Radio and Power connector are properly connected.

6.2 Connecting to the Local Craft Port

Connect to the local Craft port using a laptop computer to view alarms sent to the radio from
the MPS48-7M. The MPS48-7M sends data to the radio once every three minutes under
normal conditions, and once every 30 seconds under alarm conditions. The table below lists
the reported alarms. Refer to the radio manufacturer's documentation for interface protocols
and necessary equipment. The serial communications protocol is available from Alpha
Technologies.

Alarms

Input Voltage
Output Voltage
Output Power
Battery Voltage
Battery Temperature
Battery Current
Remaining Battery Capacity

24 021-511-B4-002, Rev. B

7.0 Maintenance

7.1 Battery Replacement

The MPS48-7M batteries are hot-swappable. There is no need to power down the unit when
replacing the batteries.

Required Tools and Materials:

#2 fl athead screwdriver

1. Unplug the battery connections.

2. Loosen the retaining screw on the battery retaining bracket and move the bracket clear of

the battery shelf.

3. Remove the batteries in need of replacement.

4. Replace with 7.2Ah batteries. Re-tape the battery temperature sensor to the side of the

second battery if necessary.

5. Secure the battery retaining bracket.

6. Connect the batteries; the positive battery connections are fi tted with a safety tab to

prevent misconnection.

7.2 Replacing the Power Module

Required Tools and Materials:

11/32" (9mm) wrench or socket

1. Verify utility power is OFF. Tag and lock

utility power switch.

2. Disconnect all connections to the power

module.

3. Loosen the four Keps nuts securing the

power module to the enclosure. There is
no need to remove them completely.

4. Slide the top of the power module forward

and remove the power module.

5. Install a new power module and secure

the four Keps nuts.

6. Reconnect all connections.

7. Restore AC power and verify the status LEDs do not indicate a fault. If any other

indication is present see to Section 6.0 for troubleshooting tips.

Keps Nuts Keps Nuts

25021-511-B4-002, Rev. B

7.0 Maintenance, continued

7.3 Battery Management

Batteries have limited shelf life and must be put into service in a timely manner. The chart
below provides general storage guidelines and illustrates the relationship between capacity
retention and storage temperature over time. Consult battery documentation for product
specifi c information.

100%

80%

60%

Capacity Retention Ratio %

40%

0

02468 16180141210

No supplementary charge required.
(Carry out supplementary battery
charge before use if 100% capacity is
required).

Supplementary charge required before
use. This charge will help recover the
capacity and should be made as early
as possible.

Supplementary charge may often fail
to recover the capacity. The battery
should never be left standing till this
state is reached.

Supplementary charge and storage guidelines

40°C

(104°F)

30°C

(86°F)

25°C

(77°F)

5°C

(41°F)

Storage Period (Months)

Fig. 7-1, Battery Capacity Characteristics

26 021-511-B4-002, Rev. B

Alpha Technologies

Power

®

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Copyright © 2007 Alpha Technologies, Inc. All rights reserved. Alpha is a registered trademark of Alpha Technologies. 021-511-B4-002, Rev. B.

Due to continuing product improvements, Alpha reserves the right to change specifi cations without notice.