Motech LPS 305 User Manual

LPS 305

Linear Programmable Power Supply

User’s Manual

CONTENTS

1. GENERAL INFORMATION........................................................................................................... 1

1.1 Introduction ................................................................................................................................. 1

1.2 Safety Considerations ................................................................................................................ 1

1.3 Options ........................................................................................................................................ 3

1.4 Accessories ................................................................................................................................. 3

1.5 Output Isolation .......................................................................................................................... 3

1.6 Specifications .............................................................................................................................. 3

2. INSTALLATION ............................................................................................................................ 5

2.1 Introduction ................................................................................................................................. 5

2.2 Initial inspection .......................................................................................................................... 5

2.3 Location and cooling .................................................................................................................. 5

2.4 Input power requirements .......................................................................................................... 5

2.5 Line fuse ..................................................................................................................................... 5

3. GETTING STARTED ..................................................................................................................... 6

3.1 Front panel controls and output terminals............................................................................... 6

3.2 LCD display message ................................................................................................................ 8

REFER TO THE FIGURE B. ................................................................................................................... 8

3.3 Rear panel .................................................................................................................................. 9

4. OPERATION ............................................................................................................................... 10

4.1 Initial conditions ........................................................................................................................ 10

4.2 Control of output functions ...................................................................................................... 10

4.3 Enabling/Disabling the output .................................................................................................. 11

4.4 Overload protection of 5V or 3.3V output ............................................................................. 11

5. CALIBRATION ............................................................................................................................ 12

6. USER MAINTENANCE/SERVICE .............................................................................................. 15

6.1 Fuse Replacement ................................................................................................................... 15

6.2 In Case of Difficulties .............................................................................................................. 15

6.3 If the ERROR#2 shows on LCD ............................................................................................ 15

6.4 Using the RS-232-C Serial Interface ..................................................................................... 15

1

1. GENERAL INFORMATION

1.1 Introduction

This section contains a general description of your power supply as well as its performance
specifications. Information about options and accessories are also provided.

The TPS-3025 series has been designed and tested according to EN-61010-1, Safety requirement for
Electronic Measuring Apparatus.

1.2 Safety Considerations

SAFETY PRECAUTIONS

SAFETY NOTES
The following general safety precautions must be observed during all phases of operation, service,
and repair of this instrument. Failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards of design, manufacture, and intended use of the
instrument. The manufacturer assumes no liability for the customer’s failure to comply with these
requirements.

BEFORE APPLYING POWER

Verify that the power supply is set to match the available line voltage and the correct fuse is installed.

GROUND THE INSTRUMENT

This product is provided with a protective earth terminal. To minimize shock hazard, the instrument
chassis and cabinet must be connected to an electrical ground. The instrument must be connected to
the AC power supply mains through a three-conductor power cable, with the third wire firmly
connected to an electrical ground (safety ground) at the power outlet. For instruments designed to be
hard-wired to the AC power lines (supply mains), connect the protective earth terminal to a protective
conductor before any other connection is made. Any interruption of the protective (grounding)
conductor or disconnection of the protective earth terminal will cause a potential shock hazard that
could result in personal injury. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransformer common terminal is connected to the neutral
(earthed pole) of the AC power lines (supply mains).

The RS232 (option) Ground is connected with chassis ground, and therefore the operator must take
care if the computer is also connected with other measuring devices prevent a short cut.

FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.)
should be used. Do not use repaired fuses or shout circuited fuseholders. To do so could cause a
shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by qualified service personnel. Do not replace components with power
cable connected.

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2

Under certain conditions, dangerous voltages may exist even with power cable removed. To avoid
injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and
resuscitation, is present.

DO NOT EXCEED INPUT RATINGS

This instrument must be connected to a properly grounded receptacle to minimize electric shock
hazard. Operate at line voltages or frequencies in excess of those stated on the data plate may cause
leakage currents in excess of 5.0mA peak.

SAFETY SYMBOLS

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,

practice, or the like, which, if not correctly performed or adhered to, could
result in personal injury. Do not proceed beyond a WARNING sign until the
indicated conditions are fully understood and met.

CAUTION The CAUTION sign denotes a hazard. It calls attention to a procedure,

practice, or the like, which, if not correctly performed or adhered to, could
result in damage to or destruction of part or all of the product. Do not proceed
beyond a CAUTION sign until the indicated conditions are fully understood
and met.

Chassis ground symbol

Protective Conductor terminal

Caution, risk of electric shock

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT

Because of the danger of introducing additional hazards, do not install substitute parts or perform any
unauthorized modification to the instrument. Return the instrument to a qualified dealers for service
and repair to ensure that safety features are maintained.

INSTRUMENTS WHICH APPEAR DAMAGED OR DEFECTIVE SHOULD BE MADE INOPERATIVE
AND SECURED AGAINST UNINTENDED OPERATION UNTIL THEY CAN BE REPAIRED BY
QUALIFIED SERVICE PERSONNEL.

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3

1.3 Options

Options 01 determine which line voltage is set at the factory. This information is on the rear panel
label.

Option 01: RS-232 Interface
Option 02: Rack mount Shelf

1.4 Accessories

Power cable
Operation manual
Fuse

1.5 Output Isolation

The output of the power supply is isolated from earth ground. Either output terminal may be grounded
or the output may floated up to +/- 240 Vdc (including output voltage) from chassis ground

1.6 Specifications

TRIPLE OUTPUT LINEAR POWER SUPPLY UP TO 165 WATTS

Model

LPS 305

MAX. OUTPUT POWER

165 WATTS

OUTPUT VOLTAGE

Output Voltage

0 to +30V / 0 to -30V

Fixed 3.3V / 5V

Setting Resolution

10mV

Max. output voltage

+32V / -32V

Dual tracking

0 to 30V

Tracking deviation

20mV

OUTPUT CURRENT

Output Current

0 to +2.5A / 0 to -2.5A

3A

Setting Resolution

1mA

Max. output current

+3A / -3A

Current limited approx. 3.3A

Dual tracking

0 to 2.5A

Tracking deviation

5mA

CONSTANT VOLTAGE CHARACTERISTICS (at rated output : 2.5A )

Line regulation(for change of AC 10%)

1mV

5mV

Load regulation(for load change 0 100%)

2mV

10mV

Ripple/Noise rms

1.5mVrms

2mVrms

4

Ripple/Noise (p-p)

10mVp-p

20mVp-p

Transient Response

200s Typical

Temperature Coefficient

100ppm / ℃ Typical

CONSTANT CURRENT CHARACTERISTICS (at rated output : 2.5A )

Line regulation (for change of AC 10% )

15mA Typical

Load regulation (for change from short to
full load )

10mA Typical

Ripple/Noise rms

1mArms Typical

Ripple/Noise (p-p)

5mAp-p Typical

Temperature Coefficient

200 ppm / ℃ Typical

Display

2×16 LCD with backlit; Front Panel Status

Announciators with beeper

Voltage Accuracy*

( 0.2% of rdg +2 digits )

Current Accuracy*

( 0.5% of rdg +5 digits )

Common Mode Voltage

±240Vdc

Temperature ranges

Operating: 0℃ to 40℃, less than 80% RH;

Storage: -40℃ to 70℃, less than 80% RH

Dimensions (W × H × L)

8.4" × 5.2" × 15.7"

Weight

Approx. 18 lbs

Cooling

Fan Cooled

Power Source

AC 115V  10% OR 230V  10%, 47 to 63Hz

Current Consumption

2.88A / AC 115V or 1.48A / AC 230V

Fuse Rating

5AT / 250V for AC 115V, 2.5AT / 250V for AC 230V

Options

RS-232

Accessories

User’s manual, power cord, fuse

*For output less than 5% of rated output, add 5 digits to the accuracy specification

RS232 Interface capabilities:

1. RS232C DCE interface: 9-pin D-SUB connector.

2. Port configuration: asynchronous 2400 baud, 8 data bits, 1 stop bits, no parity.