Ericsson 19A149978P1, 19A149978P2 Maintenance Manual

LBI-38550A

ericssonz

Maintenance Manual
BASE STATION

POWER SUPPLY

19A149978P1 - 120 VOLT/60 Hz
19A149978P2 - 230 VOLT/50 Hz

CAUTION

THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED
PERSONNE L ONLY. TO AVOID ELECTRIC SHOC K DO NOT PERFORM A NY
SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER ALL
SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK HAZARD.
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE.

CAUTION:
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLARIZED)
PLUG WITH AN E XTE NS ION CORD, RECE PTACLE OR OTHER OUTLET
UNLESS T HE BLADE S CAN BE FULLY INSERTED TO PREVENT BLADE
EXPOSURE.

LBI-38550

TABLE OF CONTENTS

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

IMPOR TANT SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CIRCUIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ASSEMBLY DIAGRAMS

60 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

50 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

SCHEMATIC DIAGRAMS

60 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

50 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

PART LISTS

60 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

50 Hz Power Suppl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Page

NOTICE!

This manual cover s Ericsson a nd Ge ne ral Ele ctr ic prod uc ts manu fa cture d and sol d by Ericsson Inc .

NOTICE!

Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier.
Any repairs, alterations or substitution of recommended parts made by the user to this equipment not approved by the
manuf act ure r c oul d voi d the use r’ s authority to ope ra te the equi pment in add ition to the manufac tu rer’s warranty.

NOTICE!

The software contained in this device is copyrighted by the Ericsson Inc. Unpublished rights are reserved under the
copyright laws of the United States.

This manual is publ ished by Er ic sson I nc ., without any warranty. Imp rovements a n d change s to this manual ne ce ssitated
by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be
made by Ericsson Inc., at any time and without notice. Such changes will be incorporated into new editions of this
manual. No part of this man ua l may be re produced or t ra nsmitted in a ny fo rm or by any mea ns, electro nic or me chanica l,
includin g phot oc opy ing and recording, for any pur pose , wi tho ut the exp ress wri tt en permi s sion of E ri csson Inc.

Copyright© November 1990, Ericsson GE Mobile Communications Inc.

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SPECIFICATIONS*

OUTPUT VOLTAGE

Transm it and Receive Simult a neously 13.2 Vdc ±0. 6 Vdc @ 29 Amps (F801B)

13.2 Vdc ±0. 6 Vdc @ 4 Amps (J801)

Receive only < 16.0 Vdc @ 3 Amps (J801)

Transmit only
(For 225 watt PA option)

13.2 Vdc ±0. 6 Vdc @ 33 Amps (F801B)

INPUT VOLT AGE 121 Vac ±20% (60 Hz version)

230 Vac ±15% (50 Hz version)

INPUT FREQUENCY 60 Hz ±2 Hz (60 Hz version)

50 Hz ±2 Hz (50 Hz version)

Note: For every + 1.0% change in the input frequency, the output voltage will not vary more than + 1.6% from the
output vol tage mea sure d at th e nomi na l input line fre que nc y.

INPUT LINE SURGE PROTECTION 150 V rated MO V (60 Hz version)

275 V ra te d M OV (50 Hz version)

DUTY CYCLE

For 0-33 Amp output 100% (Continuous Duty)

OUTPUT VOLTAGE RIPPLE < 100 mV p-p @ 25°C

< 200 mV p-p @ -30°C

OUTPUT TRANSIENT RESPONSE

Overshoot
Undershoot

Not to exceed 18 Volts
Not less than 11 Volts

EFFICIENCY > 70% @ rated TX/RX load current and nominal line volt-

age

FUSE CAPABILITY

Input 10 Amp (60 Hz version)

(2) 5 Amp (50 Hz version)

Output 5 Amp (Low Cu rre nt Port)

40 Amp (High Current Port)

DIMENSIONS (HxWxD) 5.25" x 19" x 10.35"

WEIGHT 45 lbs.
OPERATING ENVIRONMENT -30°C To +60°C

* These specifications are intended primarily for the use of the service personnel. Refer to the appropriate Specification

Sheet for the complet e spec ific atio nsl

LBI-38550

3

NOTE

LBI-38550

IMPORTANT SAFETY INFORMATION

1. SAV E THIS MANUAL - It contains important safety
and operat ing instruc tions.

2. Before using the product, please follow and adhere to
all warnings, safety and operating instructions located
on the product and in the manua l .

3. DO NOT expose product to rain, snow or other type of
moisture.

4. Care should be taken so obje ct s do not fal l or liq uid s do
not spill into the produ ct.

5. DO NOT expose produc t to extrem e tempe rat ure s.

6. DO NOT use auxiliary equi pment not recommended or
sold by the manufacturer. To do so may result in a risk
of fire, elect ric shoc k or inju ry to per sons.

7. To reduce risk of damage to electrical cord, pull by
plug rath er than cord when di sco nnecting uni t.

8. Make sure the cord is located so it will not be stepped
on, tripped over or otherwise subjected to damage or
stress.

9. An extension cord should not be used unless absolutely
necessary. Use of an improper extension cord could re­sult in a risk of fire and electric shock. If an extension
cord must be used, make sure:

a. That pins on the plug of the extension cord are the

same number, size and shape as those of the plug on
the power supply.

b. That the extension cord is properly wired in good

condition, and

11. DO NOT operate this product in an explosive atmos­phere unless it has been specifically certified for such
operation.

12. To reduce risk of ele ct ri c shock, unpl ug uni t fro m outl et
before attempting any maintenance or cleaning.

13. DO NOT operate this product with covers or panels re­moved.This unit does not contain any user serviceable
components.

14. Use only fuses of the correct type, voltage rating and
current rating as specified in the parts list. Failure to do
so can re sult in fire ha z ard.

15. GROUNDING AND AC POWER CORD CON-
NECTION - To reduce risk of ele ctri ca l shoc k use only
a properly grounded outlet. The unit is equipped with
an electric cord having an equipment - grounding con­ductor and a grounding plug. Be sure the outlet is prop­erly installed and grounded in accorda nce with all local
codes and ordinances.

16. DANGER - Never alter the AC cord or plug. Plug into
an outlet properly wired by a qualified electrician. Im­proper connection or loss of ground connection can re­sult in risk of an elect ri cal shock .

17. The Model 19A149978P2 is for use on a circuit having
a nominal rating of 230 Vac and is factory equipped
with a specific electric cord to permit connection to an
accepta ble el ec tric circui t. A plug meeting local ele ct ri ­cal codes must be supplied by the customer. Make sure
the unit is connected to an outlet having the same con­figuration as the plug. No adapter should be used with
this unit.

c. That the wire size is large enough for AC ampere rat -

ing of unit.

10. DO NOT operate unit with a dama ged cord or plug - re­place them immediately.

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A ferroresonant power supply is designed to work spe­cifically at a given frequency. The 60 and 50 Hz sup­plies should be used at their nominal frequenc y ±2 Hz.

LBI-38550

Figure 1 - 60 Hz Power Supply (19A149978P1 , Rev. B)

Figure 2 - 50 Hz Power Supply (19A149978P2, Rev. A)

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LBI-38550

DESCRIPTION

The ERICSSON GE MASTR II Base Station Power

Supply provides up to 435 watts to power the base station
receiver, systems circuitry, and transmitter. The power sup­ply normally will be used to provide power to a MASTR II
Base Station with a maxim um of 29 Amp s to the power am­plifier and 4 Amps for the Receiver/systems circuitry. The
supply can also optionally be used to power a 225 watt
power amplifier. In this case the supply is conne cte d only t o
the power amplifier and will provide a maximum of 33
Amps.

The 60 Hz Model (19A149978P1) operates from a
nominal 121 Vac, 60 Hz source. If a 208/220/ 240 Vac 60 Hz
Source is to be used, an external step-down transformer
(similar to 19C307148P1) must be used with the 978P 1
supply. The 50 Hz Model (19A149978P2) provides the
same outputs as the ’978P1 supply but operates from a
nominal 230 Vac, 50 Hz source. The output voltage will
change a maximum of + 1.6% for each + 1.0% change in
the input li ne fre que ncy .

NOTE

A ferroresonant power supply is designed to work spe­cifically at a given frequency. The 60 and 50 Hz sup­plies should be used at their nominal frequenc y ±2 Hz.

The power supply’s step-down ferroresonant trans­former provides excellent line voltage regulation. For the
rated input line voltage range (±20% for P1 ±15% for P2),
the output voltage will not vary more than 2 %. A ferroreso­nant power supply provides inherently exce llen t line vol tage
surge prot ection, and reduced p arts count for high reli a bility.
No active semiconductor devices are used which could re­duce reliability.

The output voltage will vary depending on the load cur­rent that the supply is being asked to source. As the load
current rises, the output volta ge wi ll drop. Typically the out ­put voltage will be 13.2 volts for a 33 Amp load, less than

16.0 volts for a 3 Amp load, and less than 16.7 volts for no
load.

The operation and servicing of the power supply are
completely accessible from the front. The ON/OFF switch
and all fuses are located on the front panel. The low profile
slot type fuse holders contain the primary fuse F1 (F1 & F4
for 978P2) and the low current output fuse F3. The high
current output fuse F2 is mounted behind the front panel
fuse cover. The primary fuse F1 (F1 & F4 for 978P2) pro­tects the input wiring to the ferroresonant transformer (10
Amps for P1, 5 Amps each for P2). The output fuses F2 (40

Amps) and F3 (5 Amps) provide external overload protec­tion.

The 60 Hz supply provides a courtesy dual AC recepta­cle. The primary line current fuse (F1) also provides over­current protection for the dual receptacle. The 60 Hz supply
draws 5 Amps under nominal conditions and 7 Amps under
all extremes. Thus, the dual courtesy rece pta c le s a re ra te d t o
provide a line current of 3 Amps.

CIRCUIT ANALYSIS

In the 60 Hz power supply (978P 1), the ON/OFF switch
(S1) provides line voltage to the power supply through the
primary line fuse F1. In the Rev. B version, line voltage
flows through F1 to the courtesy receptacles prior to S1.
This allows line voltage to always be available at the recep­tac les. In previous models (Rev. A and earlier) , S1 app lies
line voltage to F1 and the courtesy receptacles in turn. Cur­rent then flows through the primary of step-down trans­former (T1) via the 200°C thermal fuse. The thermal fuse
would only open in the unlikely event that an internal short
would develop in the transformer. The Varistor (VR1 - 150
V rating) provides addi ti ona l input li ne volt a ge suppre s sion.

In the 50 Hz power supply (978P2), the ON/OFF switch
(S1) is a DPST type switching both pri mary AC lines. In ad­dition, both input lines have 5 Amp fuses (F1 and F4). The
Varistor (VR1 - 275 V rating) provides additional input line
voltage suppression. When power is applied, current flows
through the primary of step-down transformer (T1) via the
200°C thermal fuse. As in the 60 Hz model, the thermal fuse
will open if the transform e r deve lo ps an inte rn al short .

The step-down transform er is a ferro re so nant type which
has inherently good input line voltage regulation - eliminat­ing the need for additional high-current regulators. C1
serves as a resonating capa ci tor ac ro ss the sec onda ry ta ps o f
the transformer.

The transformer steps the input voltage down to ap­proximately 14 volts (for a 33 Amp loa d) a nd 16 volt s (for a
3 Amp load). It then a pp li es t he ste pp ed-down volta ge to t he
full wave rectifier circuitry consisting of D1A,B through
D3A,B and the high current filter. The rectifiers are dual di­ode packages and are mo unted on heat sink HS1.

The high current filter consists of C2-C7 and L1. It is
designed to reduce the out put rip ple to less tha n 1 00 m V p-p
for any current load up to 33 Amps. It also keeps transient
responses greater than 11 and le ss tha n 18 volt s. Resi stor R 1
is a 10 ohm, 50 watt resistor that serves two functions. One,
it acts as a bleeder resistor to discharge the capacitors when
the supply is turned off. Two, it provides a minimum current

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