Lambda LDS-P-150, LDS-P-120, LDS-P-100, LDS-P-03, LDS-P-02 Instruction Manual

...

ALAMBDA

LAMBDA ELECTRONICS

MELVILLE.

L. I.. N. Y.

INSTRUCTION MANUAL

FOR

REGULATED POWER SUPPLIES

LDS-P-SERIES

inis 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-P models unless otherwise specified.

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

MAIN PLANT TELEPHONE: (516) 694-4200

IM-LDS-P

TABLE OF CONTENTS

Section Page

SPECIFICATIONS AND FEATURES 1

OPERATING INSTRUCTIONS 4

Basic Mode of Operation 4 Connections for Operation 4 Supply Load Connections 4 Mounting of Optional Overvoltage Protector Accessories 6 Operation After Protective Device Shutdown 6

MAINTENANCE 6

General 6 Trouble Analysis 6 Checking Transistors and Capacitors 7 Printed Circuit Board Maintenance Techniques 7 Performance Checks 8 Adjustment of Calibration CoAtrol R105 8

SERVICE 9

PARTS ORDERING 9

ii IM-LDS-P

SPECIFICATIONS AND FEATURES

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

TABLE 1

MAXIMUM CURRENT (AMPS)* AT AMBIENT TEMPERATURE

VOLTAGE

MODEL

RANGE

40° C

50°

60°C

(WATTS)**

INPUT POWER

LDS-P-5-0V LDS-P-12 LDS-P-15 LDS-P-20 LDS-P-24

LDS-P-28 LDS-P-48 LDS-P-01 LDS-P-02 LDS-P-03 LDS-P-100 LDS-P-120

LDS-P-150

Current range must be chosen to suit the appropriate maximum ambient temperature. Cunent ratings apply for entire 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 cunent rating and input voltage 127 volts AC, 60 Hz.

fWith or without cover.

5± 5% 12 ± 5% 15 + 5%

20 ± 5% 24 ± 5% 28 ± 5% 48 ± 5%

0-7 0-18

0-32 100 ± 5% 120 ± 5% 150 ± 5%

22.0(20.9)

14.0(13.3)

12.0(11.4)

10.0(9.5)

9.0(8.5)

8.0(7.6)

4.5 (4.28)

9.5 (9.0)

4.5(4.3)

2.7 (2.5)

1.6t

1.4t

l.lt

18.8(18.0)

12.4(11.8)

10.6 (10.0)

8.9(8.5)

8.0 (7.6)

7.1 (6.7)

4.0(3.8)

8.5 (8.0)

4.0(3.8)

2.5 (2.4)

1.4t

1.2t

0.9t

15.6 (14.8)

10.0(9.5)

8.5(8.1)

7.0(6.6)

6.0(5.7)

5.2 (4.9)

3.4(3.2)

7.5(7.1)

3.3 (3.1)

2.3 (2.2)

1.2t

i.ot

0.8t

345 380 395 405 410 425 420 175 170 160 270 270 270

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

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

IM-LDS-P

V rms, 1 mV peak to peak for LDS-P-5-OV thru -48-OV and LDS-P-01, 120,

with external programming resistors; 01,

02, 03 with intemal programming resistors and on 5V thm

150V units.

02, 03; 250

150 with either positive or negative terminal grounded.

V rms, 1 mV peak-to-peak for LDS-P-100,

±(0.01%

+10 /iV)/°C on

Remote Programming

Extemal Resistor Nominal 1000 ohms/volt output. Downward programming

to voltages less than 1.0 volt must be accomplished in two steps; first, from original voltage value to 1.0 volt, and then from

1.0 volt to final desired value less than 1.0 volt.

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 conditions of power tum-on, AC INPUT — 105-127 or 210-254 volts ACat 47-440 Hz. Standard LDS-P 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 input, derate 40°C rating by 10%. For 63-440 Hz input consult factory. Use an 8A, 250V, Norm-Blo fuse in AC line (not supplied in uni^for 110 VAC input. Use a 4A, 250V Norm-Blo fuse in AC input line for 220VAC input. Where applicable, regulatory agency approval applies only for input voltages up to 250VAC.

OVERLOAD PROTECTION

Thermal Thermostat, resets automatically when over temperature con-

dition is eliminated.

Electrical Automatic electronic cunent limiting circuit, limits output cur-

rent to a SEife value. Automatic cunent limiting protects the load and power supply when direct shorts occur.

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

circuit which prevents damage to the load caused by excessive power supply output voltage. Over-

voltage protection range varies between 6.3 and 6.9 volts DC.

ISOLATION RATING — 10 megohm isolation minimum from DC to ground at 1000 VDC.

turn-off,

or power failure.

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

AC input Screw terminals on printed circuit board Ground Terminal on transformer DC output Screw terminals on printed circuit board; solder tunet pro-

vided for remote programming operation.

Sensing Screw terminals on printed circuit board

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

60° C

ambient with conesponding load cunent rating for all modes of operation. STORAGE TEMPERATURE (non-operating) - -55°C to +85°C

TRANSFORMER - MIL-T-27C, Grade 6; electrostatic shield; 4,000 VAC input/output isolation. FUNGUS — All LDS-P power supplies are fungus inert.

IM-LDS-P

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 adjustment range of 1% to

max is provided by the intemal programming potentiometer; programming over the full 0 to

max range can be accomplished by remote programming.

PHYSICAL DATA

Size 11" X 4-7/8" x 4-13/32" with or without cover in place

Weight 14 lbs. net., 15-1/2 lbs. shipping

Finish Gray, FED. STD. 595 No. 26081

MOUNTING — One surface, with tapped mounting holes, can be utilized for mounting this unit. The

supply must be mounted with top side facing up, in horizontal plane.

ACCESSORIES

Overvoltage Protector Internally mounted L-35-OV-5 series overvoltage protector,

standard on 5V unit. Intemally mounted L-20-OV series over-

voltage protectors optional on LDS-P-12 thm LDS-P-28; overvoltage protector L-35-OV-6 optional on LDS-P-6 smd overvoltage protector LMOV-3 optional on model LDS-P-48. LHOV series adjustable overvoltage protector accessory optional for models LDS-P-01 through LDS-P-03.

max

IM-LDS-P

OPERATING INSTRUCTIONS

BASIC MODE OF OPERATION

This power supply operates as a constant voltage source provided the load cunent does not exceed the rated value at 40°C. For continuous operation, load current must not exceed the rating for each Eunbient temperature. When load exceeds 105% of voltage reaches zero and the cunent at short circuit equals approximately 20 percent or less of the rated current. (For wide range models, 01, 02 and 03 short circuit current equals the rated cunent).

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 tenninal grounded. Both positive and negative ground cormections Eire shown 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 terminals; 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.

40° C

rating, both voltage and current decrease until

SUPPLY LOAD CONNECTIONS Connections for Operation as a Constant Voltage Source

The output impedance and regulation of the power supply at the load may chemge 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 with local or remote sensing are described in the following paragraphs.

Refer to figure 1 to determine voltage drop for particular cable length, wire size and cunent condi-

tions.

Lead lengths must be measured from supply terminals to load terminals as shown in figure 2.

Local Sensing Connection, Figure 3. Local sensing is the connection suitable for application with relatively constant load or for applications with short power output leads.

Remote Sensing Connection, Figure 4. Remote sensing provides complete compensation for the DC

voltage drops in the connecting cables. Sensing leads should be a twisted pair to minimize AC pick-up. A

2.5 mf, elect., capacitor may be required between output terminals and sense tenninals to reduce noise

pick-up.

Programmed Voltage Connections, Using External Resistor, Figure 5. Discrete voltage steps can be programmed with a resistance voltage divider valued at 1000 ohms/volt change and shorting-type switch as

shown in figure 5. When continuous voltage variations axe required, use a variable resistor with the same 1000 ohms/volt ratio in place of the resistive voltage divider and shorting-type switch. Use a low temperature coefficient resistor to assure most stable operation. On wide range models, downward

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