Lambda LDS-X-48, LDS-X-01, LDS-X-02, LDS-X-03, LDS-X-28 Instruction Manual

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ALAMBDA

LAMBDA ELECTRONICS MELVILLE, L. I., N. Y.

INSTRUCTION MANUAL

FOR

REGULATED POWER SUPPUES

LDS-X-SERIES

This manual provides instructions intended for the operation of Lambda power supplies, and is not to be reproduced without the written consent of Lambda Electronics. All information contained herein applies to all LDS-X models unless otherwise specified.

'•• LAMBDA ELECTRONICS MELVILLE, L.I., N.Y. ;» MAIN PLANT TELEPHONE: 516 MYrtle 4-4200

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o»

TABLE OF CONTENTS

Section Page

SPECIFICATIONS AND FEATURES 1

OPERATING INSTRUCTIONS 3

Basic Mode of Operation 3 Connections for Operation 3 Supply Load Connections 3

Mounting of L-12-0V Overvoltage Protector Accessory 5 Mounting of LH OV Overvoltage Protector Accessory 5 Operation After Protective Device Shutdown 5

MAINTENANCE 5

General ^ Trouble Analysis 6

Checking Transistors and Capacitors 6 Printed Circuit Board Maintenance Techniques 6 Performance Checks '^ Adjustment of Calibration Control R105 '^

SERVICE 8 PARTS ORDERING 8

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SPECIFICATIONS AND FEATURES

D.C. OUTPUT — Voltage regulated for line and load. See table I for voltage and current ratings.

TABLE I

MAXIMUM CURRENT AMPS)*

MODEL

VOLTAGE

RANGE

AT AMBIENT TEMPERATURE

40° C

50° C

60° C

INPUT

POWER

(WATTS)**

LDS-X-5-0V LDS-X-6 LDS-X-12 LDS-X-15 LDS-X-20 LDS-X-24 LDS-X-28 LDS-X-48 LDS-X-01 LDS-X-02 LDS-X-03

Current range must be chosen to suit the appropriate maximum ambient temperature. Current ratings apply for entier voltage range.

•Ratings apply for use with cover removed. Use ratings in parentheses when unit is used with cover. Refer to figure 12 for cover removal.

**With output loaded to full current rating and input voltage 127 volts AC, 60 Hz.

5± 5%

6 ± 5% 12 ± 5% 15 ± 5% 20 ± 5% 24 ± 5% 28 ± 5% 48 ± 5% 0-7 0-18 0-32

10.0(8.5)

9.5 (8.1)

6.5 (5.5)

5.5(4.7)

4.4 (3.7)

3.8(3.2)

3.4 (2.9)

2.1 (1.9)

4.8(4.1)

2.3(1.95)

1.5(1.25)

8.6 (7.3)

7.9(6.7)

5.5 (4.7)

4.6 (3.9)

3.6(3.1)

3.2(2.7)

2.9(2.5)

1.8(1.6)

4.0(3.4)

1.9(1.6)

1.3(1.1)

7.0 (6.0)

6.4 (5.4)

4.5 (3.8)

3.6(3.1)

2.6 (2.2)

2.4 (2.0)

2.2(1.9)

1.4(1.2)

3.1 (2.6)

1.5(1.3)

1.1 (0.95)

180 180 220 200 200 200 200 230 110 100 100

REGULATED VOLTAGE OUTPUT

Regulation (Line) 0.005% +0.5 mV for input variations from 105-127, 127-105,

210-254, or 254-210 volts AC.

Regulation (Load) 0.005% +0.5 mV for load variations from no load to full load or

full load to no load.

Ripple and Noise 150 ju V rms, 1 mV peak-to-peak with either positive or negative

terminal grounded.

Temperature Coefficient Output change in voltage ±(0.005% +10 tiV)/°C on 01, 02, 03

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with extemal programming resistors. 02,

03 with intemal programming resistors and on 5V thru 48V

units.

±(0.01%

+10 iiV)/°C on 01,

Remote Programming

Extemal Resistor Nominal 1000 ohms/volt output. Downward programming to

voltages less than 1 volt must be accomplished in two steps; first, from original voltage value to 1 volt, and then from 1 volt to final desired value.

Programming Voltage One-to-one voltage change.

Remote Sensing Provision is made for remote sensing to eliminate effect of power

output lead resistance on DC regulation.

OVERSHOOT — No overshoot under conditons of power tum-on,

AC INPUT - 105-127 or 210-254 volts AC at 47-440 Hz. Standard LDS-X power supplies are factory

wired for 105-127 volt input, but can be rewired for 210-254 volt input. See figure 8 and schematic diagram for rewiring of AC input. For input power see table I. Ratings apply for 57-63 Hz input. For 47-53 Hz or 63-440 Hz input consult factory.

OVERLOAD PROTECTION

Thermal Thennostat, resets automatically when over temperature condi-

tion is eliminated.

Electrical Automatic electronic current limiting circuit, limits output cur-

rent to a safe value. Automatic current limiting protects the load and power supply when extemal overloads and direct shorts occur.

OVERVOLTAGE PROTECTION - Model LDS-X-5-OV includes a fixed built-in overvoltage protection

circuit which prevents damage to the load caused by excessive power supply output voltage. Overvoltage protection range varies between 6.3 and 6.9 volts D.C.

INPUT AND OUTPUT CONNECTIONS - Refer to figure 12 for location.

AC input Screw terminals on printed circuit board Ground Terminal on transformer

turn-off,

or power failure.

DC output Screw terminals on a printed circuit board

Sensing Screw terminals on printed circuit board

OPERATING AMBIENT TEMPERATURE RANGE AND DUTY CYCLE - Continuous duty firom 0°C to

60° C

ambient with corresponding load current rating for all modes of operation. STORAGE TEMPERATURE (non operating) - -55°C to +85°C FUNGUS — All LDS-X power supplies are fungus inert. DC OUTPUT CONTROL — Screwdriver voltage adjust control permits adjustment of DC output voltage.

Refer to figure 12 for location of control. On wide range models, an adjustable range of 1% Vo max to Vo max is provided by the intemtd programming potentiometer; programming over the full 0 to Vo max range c£m be accomplished by remote programming.

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PHYSICAL DATA

Size 7" X 4-7/8" x 2-7/8" with cover in place

x 4-7/8" X 2-3/4" with cover removed

Weight 7-3/4 lbs. net., 8-1/4 lbs. shipping

Finish Gray, FED. STD. 595 No. 26081

MOUNTING — Three surfaces, two with tapped mounting holes and one with clearance mounting holes,

can be utilized for mounting this unit. Two mounting surfaces on LDS-X-01 thru 03 and LDS-X-48

when used with optional LH OV series overvoltage protectors. Air circulation is required when unit is mounted in confined areas. Refer to figure 12 for mounting details.

OVERVOLTAGE PROTECTOR — Intemally mounted L-12-OV series overvoltage protector, standard on

5V unit. Intemally mtd L-12-OV series overvoltage protectors optional on LDS-X-6 thru LDS-X-28. LH OV series extemally mounted, adjustable overvoltage protector accessory for LDS-X-01 through LDS-X-03 and LDS-X-48 are available.

OPERATING INSTRUCTIONS

BASIC MODE OF OPERATION

This power supply operates as a constant voltage source provided the load current does not exceed the rated value at temperature. When load exceeds 105% of 40°C rating, both voltage and current decrease until voltage

reaches zero and the current at short circuit equals approximately 40 percent or less of the rated current.

(For wide range models, short circuit current equals the rated current.)

40°

For continuous operation, load current must not exceed the rating for each ambient

CONNECTIONS FOR OPERATION

NOTE: Make all connections to the unit before applying AC input power.

Ground Connections. The Lambda power supply can be operated either with negative or positive output terminal grounded. Both positive and negative ground connections aie shovm for all suggested output

connections illustrated in this manual.

Connection Terminals. Make all connections to the supply at the terminals provided. Apply input power to AC tenninals; always connect the ungrounded (hot) lead to terminal indicated in figures 3 through 9.

The supply positive terminal is brought out to terminal +V. The supply negative terminal is brought out to terminal -V. Recommended wiring of the power supply to the load and selection of wiring is shown in figures 1 through 9. Selection of proper wiring is made on the basis of load requirements. Make all performance checks as shown in figure 11. Connect measuring devices directly to terminals or use the shortest leads possible.

SUPPLY LOAD CONNECTIONS

Connections for Operation as a Constant Voltage Source

The output impedance £md regulation of the power supply at the load may change when using the supply as a constant voltage source and connecting leads of practical length are used. To minimize the effect of the output leads on these characteristics, remote sensing is used. Recommended types of supplyload connections vsrith loc£il or remote sensing are described in the following paragraphs.

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