Summary of Contents for SEC 1024 MS
- Page 1 A C P O W E R S O U R C E D C - A C I N V E R T E R S 1024 MS MODELS: 1624 MS 2724 MS OWNER'S MANUAL Please read this manual before operating your charger.
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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 AC Power Distribution and Grounding ............8,9,10 Principle of Operation ..................11 Devices that may not Operate Correctly with Modified Sine Wave Inverters ...................... -
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 system... - 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
- Vpeak =170 V and then slowly drops back to 0 V. There are 60 such cycles in 1 sec. Cycles per second is called the “frequency” and is also termed “Hertz (Hz.). If a linear load is connected to this type of voltage, the load will draw current which will also have the same sine wave-form. -
Page 9: 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. - Page 10 CAUTION! : For the 120 VAC, 60 Hz NEMA 5-15R receptacles in 1024 MS and 1624 MS, the current carrying conductor connected to the longer rectangular slot is isolated from the metal chassis of the inverter.
- Page 11 15R receptacle and breaker to their front panel, these should be grounded as in the case of 1024 MS and 1624 MS i.e. connect a # 8 AWG insulated stranded copper wire from the equipment grounding bolt to the earth ground connection ( a connection that connects to the ground rod or to the water pipe or to another connection that is solidly bonded to the earth ground ).
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Page 12: Principle Of Operation
+155 to 170V, Peak It crosses 0 V immediately. Has RMS value of 120V Modified Sinewave: Shoots straight up, /60 sec levels off at peak & drops straight down. Also, it sits at 0 V for some time. -155 to -170V, Peak... -
Page 13: Inverters
DEVICES THAT MAY NOT OPERATE ON MODIFIED SINE WAVE The output wave form of these inverters is a modified sine wave. See the diagram under “Principle of Operation” on page 11. 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 14: Limiting Electromagnetic Interference
LIMITING ELECTRO-MAGNETIC INTERFERENCE (EMI) The inverter contains internal switching devices which generate conducted and radiated electromagnetic interference (EMI). The EMI is more pronounced in inverters whose output voltage has modified sine wave form as modified sine wave form is composed of odd harmonics of the fundamental frequency. -
Page 15: Layout
LAYOUT 1024 MS, 1624 MS Bottom View Rear View 2724 MS Front View Rear View Page 14... -
Page 16: Features, Controls And Indications
FEATURES, CONTROLS & INDICATIONS Important : Each of the following operating procedures and safety features must be carefully reviewed and thoroughly understood prior to using the inverter. Failure to do so may result in damage to the inverter or equipment or serious personal injury ON/OFF Switch. - Page 17 When the reading rises to the RED zone, the inverter may automatically shut down. Two Standard North American NEMA 5-15R Receptacles are provided on models 1024 MS and 1624 MS. On 2724 MS, the output is available from unconnected, Line (BLACK), Neutral (WHITE) and chassis/equipment ground (GREEN) wires for connection to an external breaker panel.
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Page 18: 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 19 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 20 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 21 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 22 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 23: Installation
INSTALLATION The success of a DC to AC power inverter installation depends mainly on the methods and materials used for installation. Please read and comply with instructions given below 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 24 Cooling by forced air fan ventilation The inverters produce heat when operating. The amount of heat produced is proportional to the amount of power supplied by the inverter. DC fans are used to provide forced air cooling of these inverters. The fans are thermostatically controlled and will be switched on only if the temperature of certain hot spot inside the inverter rises above a certain temperature.
- Page 25 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’ Ampere rating of fuse 1024 MS # 4 AWG #2 AWG 125 A 1624 MS...
- Page 26 DC input terminals on 1024 MS and 1624 MS The DC input terminals on 1024 MS and 1624 MS have a tubular hole with a set screw. A suitable pin type of copper terminal should, therefore, be used on the cable end.
- Page 27 / load centre. AC output connections - 1024 MS / 1624 MS These inverters use NEMA 5-15R receptacles for connecting the AC output to devices and appliances fitted with a NEMA 5-15P plug. In these NEMA 5-15 R receptacles, two rectangular slots are connected to the current-carrying conductors of the AC power source inside the inverter.
- Page 28 15R receptacle and breaker to their front panel, it should be grounded as in the case of 1024 MS and 1624 MS i.e. connect a # 8 AWG insulated stranded copper wire from the equipment grounding bolt to the earth ground connection ( a connection that connects to the ground rod or to the water pipe or to another connection that is solidly bonded to the earth ground ).
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Page 29: 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 30: 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 31 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. A reversal of polarity (the positive of the battery to the negative DC input wrongly connected...
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Page 32: Troubleshooting Guide
TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE CAUSE REMEDY On switching on, the input voltage bar There is no voltage at the DC input 1. Check the continuity of the battery graph indicator does not light. There is terminals input circuit. no AC voltage 2. - Page 33 SYMPTOM POSSIBLE CAUSE REMEDY The AC output shuts down sometimes Temporary shut-down of the AC output 1. Reduce the load and resumes automatically. Overload due to instantaneous overload beyond 2. The load is not suitable as it requires LED is not lighted ( might happen the surge power rating of the inverter higher power to operate.
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Page 34: Specifications
SPECIFICATIONS 1024 MS 1624 MS 2724 MS Input Voltage, Volts DC 20-33 V 20-33V 20-33 V Output voltage, Volts RMS 120 V +5% / -10% 120 V + 5% / -10% 120 V + 5% / -10% Output frequency, Hz... -
Page 35: Warranty
2 YEAR Limited Warranty 1024 MS, 1624 MS & 2724 MS's sold by SEC America, LLC (the “Warrantor") are warranted to be free from defects in workmanship and materials under normal use and ser- vice. 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 36 P.O. Box 2266 81 Ethan Allen Drive South Burlington, VT 05407 e-mail: sales@secamerica.com website: www.secamerica.com January 2007...
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