Related Manuals for Samlexpower PST-30S-12A
Summary of Contents for Samlexpower PST-30S-12A
- Page 1 A C P O W E R S O U R C E PURE SINE WAVE DC-AC I N V E R T E R MODEL: PST-30S-12A OWNER'S MANUAL Please read this manual before operating your inverter.
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Page 2: Table Of Contents
INDEX INDEX Safety Instructions ..................... 2,3 Inverters - General Information ..............4,5,6 Characteristics of Sinusoidal AC Power ............... 7 Advantages of Sine Wave Inverters ..............8 AC Power Distribution and Grounding ............. 9,10,11 Limiting Electromagnetic Interference (EMI) ............ 11 Power direct/embedded SMPS ................12 Principle of Operation .................. -
Page 3: Safety Instructions
SAFETY INSTRUCTIONS Please read these instructions before installing or operating the inverter to prevent personal injury or damage to the inverter. GENERAL Installation and wiring compliance - Installation and wiring must comply with the local and national electrical codes and must be done by a certified electrician Preventing electrical shock - Always connect the grounding connection on the inverter to the appropriate grounding... - Page 4 INVERTER RELATED Preventing paralleling of the AC output The AC output of this inverter cannot be synchronised with another AC source and hence, it is not suitable for paralleling. The AC output of the inverter should never be connected directly to an electrical breaker panel / load center which is also fed from the utility power / generator.
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Page 5: Inverters - General Information
INVERTERS - GENERAL INFORMATION Why an inverter is needed The utility grid supplies you with alternating current (AC) electricity. AC is the standard form of electricity for anything that “plugs in” to the utility power. Direct current (DC) electricity flows in a single direction. Batteries provide DC electricity. AC alternates its direction many times per second. - Page 6 Loads that require “surge power” to start Resistive types of loads (like incandescent lamps, toaster, coffee maker, electric range, iron etc) do not require extra power to start. Their starting power is the same as their running power. Some loads like induction motors and high inertia motor driven devices will initially require a very large starting or “surge”...
- Page 7 Power rating of Microwaves The power rating of the microwave generally refers to the cooking power. The electrical power consumed by the microwave will be approximately 2 times the cooking power. The “surge power” of the inverter should be 2 times the electrical power (i.e., 4 times the cooking power).
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Page 8: Characteristics Of Sinusoidal Ac Power
CHARACTERISTICS OF SINUSOIDAL AC POWER Voltage, current, power factor, types of loads The voltage waveform of 120 VAC, 60 Hz mains / utility power is like a sine wave. In a voltage with a sine wave-form, the instantaneous value and polarity of the voltage varies with respect to time and the wave-form is like a sine wave. -
Page 9: Advantages Of Sine Wave Inverters
ADVANTAGES OF A PURE SINE-WAVE INVERTER OVER A MODIFIED SINE-WAVE INVERTER The output voltage of a sine-wave inverter has a sine wave-form like the sine wave-form of the mains / utility voltage. In a sine wave, the voltage rises and falls smoothly with a smoothly changing phase angle and also changes its polarity instantly when it crosses 0 Volts. -
Page 10: Ac Power Distribution And Grounding
AC POWER DISTRIBUTION AND GROUNDING CAUTION! PLEASE NOTE THAT THE AC OUTPUT CONNECTIONS AND THE DC INPUT CONNECTIONS ON THESE INVERTERS ARE NOT CONNECTED (BONDED) TO THE METAL CHASSIS OF THE INVERTER. BOTH THE INPUT AND OUTPUT CONNECTIONS ARE ISOLATED FROM THE METAL CHASSIS AND FROM EACH OTHER. SYSTEM GROUNDING, AS REQUIRED BY NATIONAL / LOCAL ELECTRICAL CODES / STANDARDS, IS THE RESPONSIBILITY OF THE USER / SYSTEM INSTALLER. - Page 11 Grounded Electrical Power Distribution System The National Electrical Code (NEC) requires the use of a “grounded electrical distribu- tion system”. As per this system, one of the two current-carrying conductors is required to be grounded. This grounded conductor is called the “Neutral / Cold / Return”. As this conductor is bonded to earth ground, it will be at near zero voltage or potential.
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Page 12: Limiting Electromagnetic Interference (Emi)
Grounding to earth or to other designated ground For safety, the metal chassis of the inverter is required to be grounded to the earth ground or to the other designated ground (For example, in a mobile RV, the metal frame of the RV is normally designated as the negative DC ground). -
Page 13: Power Direct/Embedded Smps
POWERING DIRECT / EMBEDDED SWITCHED MODE POWER SUPPLY (SMPS) Non-linear nature of current drawn by Switched Mode Power Supplies Power supplies are used to convert AC voltages like 120 VAC to various DC voltages like 3.3 V, 5 V, 12 V, 24 V, 48 V etc. Majority of modern day electronic devices use embedded general purpose Switch Mode type of Power Supplies (SMPS) to drive the electronic circuitry. -
Page 14: Principle Of Operation
PRINCIPLE OF OPERATION The inverter converts the 12 V (nominal) DC voltage of the battery to 120 V, 60 Hz. AC voltage. The voltage conversion takes place in two stages. In the first stage, the 12 V (nominal) DC voltage of the battery is converted to a high voltage DC using high frequency switching and Pulse Width Modulation (PWM) technique. -
Page 15: Specifying Batteries, Chargers And Alternators
SPECIFYING BATTERIES, CHARGERS & ALTERNATORS The inverter will require Deep Cycle Lead Acid Batteries of appropriate capacity. Lead-acid batteries can be categorized by the type of application: automotive service - Starting/Lighting/Ignition (SLI, a.k.a. cranking) and deep cycle service SLI Batteries Everybody is familiar with the SLI batteries that are used for automotive starting and powering vehicular accessories. - Page 16 Typical battery sizes Below is a chart of some battery sizes applicable for powering inverters: BCI * Group Battery Voltage, V Battery AH 27 / 31 GC2** * Battery Council International ** Golf Cart Reduction in usable capacity at higher discharge rates. As stated above, the rated capacity of the battery in AH is applicable at a discharge rate of 20 Hours.
- Page 17 Depth of discharge and battery life The more deeply a battery is discharged on each cycle, the shorter the battery life. Using more batteries than the minimum required will result in longer life for the battery bank. A typical cycle life chart is given at Table 2 below: TABLE 2.
- Page 18 Sizing the Inverter Battery Bank One of the most frequently asked question is, “how long will the batteries last?’. This question cannot be answered without knowing the size of the battery system and the load on the inverter. Usually this question is turned around to ask “How long do you want your load to run?”, and then specific calculation can be done to determine the proper battery bank size.
- Page 19 Charging Batteries The batteries can be charged by using good quality AC powered battery charger or from alternative energy sources like solar panels, wind or hydro systems. Make sure an appropriate battery charge controller is used. It is recommended that the batteries may be charged at 10% to 13 % of the Ampere Hour capacity (20 hour discharge rate).
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Page 20: Installation
INSTALLATION GENERAL Installation and wiring compliance - Installation and wiring must comply with the local and the national electrical codes and must be done by a certified electrician - In building / residential applications, electrical codes do not allow permanent connection of AC distribution wiring to the inverter’s AC output receptacles. - Page 21 Precautions when working with batteries. - Batteries contain very corrosive diluted sulphuric acid as electrolyte. Precautions should be taken to prevent contact with skin, eyes or clothing - Batteries generate hydrogen and oxygen during charging resulting in evolution of explosive gas mixture. Care should be taken to ventilate the battery area and follow the battery manufacturer’s recommendations.
- Page 22 2 times the distance between the inverter and the battery assuming that two ( one positive and one negative)cables are used for the connection ) Distance up to 4’ Distance up to 6’ Battery fuse PST-30S-12A # 6 AWG # 4 AWG 50 A (ANN 50) CAUTION! The input section of the inverter has large value capacitors connected across the input terminals.
- Page 23 Battery cable set provided For convenience, a 3' battery cable set with battery clips and a 3' battery cable set with cigar plug have been provided. These can be used if it is possible to install the inverter close to the battery. NOTE: When using cable with cigar plug, limit the power to less than 100 watts as the cigarette lighter receptacle wiring in a vehicle is normally fused for 4 to 5A Reducing RF interference...
- Page 24 AC output connections The inverter uses NEMA 5-15R receptacle for connecting the AC output to devices and appliances fitted with a NEMA 5-15P plug. In this NEMA 5-15 R receptacle, two rectangular slots are connected to the current-carrying conductors of the AC power source inside the inverter.
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Page 25: Operation
OPERATION Powering on the loads After the inverter is switched on, it takes a finite time for it to become ready to deliver full power. Hence, always switch on the load(s) after a few seconds of switching on the inverter. Avoid switching on the inverter with the load already switched on. This may prematurely trigger the overload protection. -
Page 26: Protection Against Abnormal Conditions
No load draw (idle current) When the on / off switch is turned on, all the circuitry inside the inverter becomes alive and the AC output is made available. In this condition, even when no load is being supplied (or, if a load is connected but has been switched off), the inverter draws a small amount of current from the batteries to keep the circuitry alive and ready to deliver the required power on demand. - Page 27 Shut-down due to reversal of polarity at the DC input terminals. The positive of the battery should be connected to the positive DC input terminal of the inverter and the negative of the battery should be connected to the negative DC input terminal of the inverter.
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Page 28: Troubleshooting Guide
TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE CAUSE REMEDY On switching on, LED (2) does not light. There is no voltage at the DC input 1. Check the continuity of the battery Buzzer is off. There is no AC voltage terminals input circuit. 2. - Page 29 SYMPTOM POSSIBLE CAUSE REMEDY Buzzer alarm is sounded. Shut-down due to over temperature 1. Check that the fan is working. If not, LED (2) is orange. because of fan failure or inadequate the fan / fan control circuit may be There is no AC output.
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Page 30: Specifications
SPECIFICATIONS Input Voltage ................10.5 to 16.5 V DC Input Current at No Load................700 mA Output Voltage ................120 V AC +/- 3% Output Frequency ..................60 Hz Output Voltage Waveform ..............Sine Wave Total Harmonic distortion ................< 3% Output Power -Continuous.................. -
Page 31: Warranty
2 YEAR Limited Warranty The PST-30S-12A manufactured by Samlex America, Inc. ( the “ Warrantor “ ) is warranted to be free from defects in workmanship and materials under normal use and service. This warranty is in effect for 2 years from the date of purchase by the user ( the “ Purchaser “) For a warranty claim, the Purchaser should contact the place of purchase to obtain a Return Authoriza- tion Number. - Page 32 110-17 Fawcett Road, Coquitlam B.C., Canada V3K 6V2 e-mail: samlex@samlexamerica.com website: www.samlexamerica.com Version PST-30S-12A (July2005)