Cobra CPI 2575 Support Question

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Question posted by brubaker2new on October 9th, 2013

High Pitch Whine

i'm a general electronics tech. a friends inverter has a high pitch whine with 12vdc connected/ switch off/ no load plugged in. ? any ideas please? wiring is correct and 12vdc measures ok. disconnecting dc and reconn makes no diff.

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Answer #1: Posted by ikonerg on November 6th, 2013 3:51 PM

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ikonerg

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If there is still warranty on devive - then probably would be worth exchanging it.

If warranty is already gone, then I suggest opening device and testing components within. One that makes noise is the Inverting Transformer - it way even be that some of it's windings are loose - they will make that noise or the core is cracked/or on it's half connections makes that noise.

To repair it you possibly would be good with epoxy glueing the core tightly together, or even getting some lacker - name for which I do not know being foreign, which will go deep into winding and solidify it still.

That is assuming that the device is working well functionally, despite the noise.

If it makes this noise and does not give out any power, then most likely there is a short in the windings of transformer or on its circuitry on output.

Let me know if this helps.

Related Cobra CPI 2575 Manual Pages

CPI2575_MANL - Page 1

...Power Inverter Works The Cobra power inInvsetarlltaetiorn is an electronic pNortoesduct that has been designed and built to take low voltage DC (Direct CurreSnecto)ndparoy wIcoensr from your automobile or other low voltage power..., RVs, boats, tractors, trucks and virtually anywhere else. 2500 WATT POWER INVERTER CPI 2575 Nothing Comes Close To A Cobra™ Intro Secondary Icons Printed in ...

CPI2575_MANL - Page 2

...C. a.rn.in.g. . . . . . 7 Installation Connecting CabNloetess 8 Jack SMeacionnIdcaornysIcons Power Consumption 12 Ground Wiring 13 Notice Caution Warning USB Power Remote On/Off Main Icons Output End Operation Notice TurnCianugtionYour InWvaerrntinegr On or Off 14 Remote On/Off Switch 15 Intro Operation Customer Warranty OpeArsasitsitanngce Indicators 16 Operating Limits...

CPI2575_MANL - Page 3

... the inverter in negative ground applications only. on Customer Warranty charged after all power is disconnected. Special...inverter should be installed and uSseceodndapryrIocopnserly. Notice Intro Caution Warning General Precautions 1. Do not Installation open the inverter; on Customer Warranty Assistance Caution and WarnInsitnallgatioSn tatements Notes To make...

CPI2575_MANL - Page 4

... WARNING Power inverteArsssisctaoncnetain components that is suitable for most AC loads (including linear and switching power suppliers used in electronic equipment,...electronic equipment may not operate satisfactory on the AC adapter or charger states that it produces a low voltage AC or DC output (less than 30 volts), the inverter will have a WARNING label stating that can be plugged...

CPI2575_MANL - Page 5

... inverter and how to power source Main Icons Intro Connect Power SMaoinuIrccones (see page 8 for testing low power level test loads only. Turn the inverter off Main Icons as possible in the test load. Connect cables to check its insulation stripped off for short term testing at the inverter dropped below 10 volts. #4 AWG stranded copper cable is a DC power supply, switch...

CPI2575_MANL - Page 6

...Make sure that is corrosion resistant (not included). Safe Do not install the inverter in the same compartment as a battery or in the same compartment) to minimize the length of 12 volts. Mounting • To mount your inverter: 1. The inverter... battery, and will be connected to batteries with the mounting...wires than longer DC wires (cables). Do not install e Caution Warning inverter...

CPI2575_MANL - Page 7

... volts. The red terminal is positive (+) and the black terminal is a DC power supply, switch it can become loose by vibrations or thermal cycling. Connect the cable from time to the load. Because the inverter has a low voltage, high current input, low resistance wiring is a good idea to check and tighten these screws from the Negative (Black) Terminal of...

CPI2575_MANL - Page 8

.... Working on AC wiring when it is connected to the inverter (even if it is switched off ) unless the DC power source is not covered by a qualified electrician. Do not work on Customer Warranty Assistance Installation Secondary Icons You might observe a spark when you are performed before making a permanent AC connection to the AC wiring at the same time...

CPI2575_MANL - Page 9

... ampere) or ampere-hour capacity (a measure of how many watts each piece of equipment consumes. Laptop TV/VCR (up to 25") Blender Warranty Warning Main Icons Intro Operation Customer Assistance Warranty Installation Ground Wiring GroundInsWtallaitironing Notes • There Secondary Icons is given, multiply the current draw by connecting to get the watt consumption...

CPI2575_MANL - Page 10

If Secondary Icons a DC power supIpntrloy is beOpienragtionused Causstomthere powWaerrranty source, switch it 's in the inverter on . NOTE The Power Button turns the control circuit in the on or off position, the inverter draws no power is low current draw. This is being supplied to a load, the inverter draws less than a week to discharge a 100 amperehour battery at once. On...

CPI2575_MANL - Page 11

... inverter is in and the three digits indicate the voltage or power value. The three LEDs indicate the mode the meter is shortcircuited for conditions that could cause it to shut down to protect itself . To restore normal operation, disconnect the excessive load and turn the unit Off and On again using the Power Button. High...

CPI2575_MANL - Page 12

... restart when the input voltage exceeds 12V+/- 0.3V. Input Voltage The inverter will occur when the voltage is within its power rating. It will operate most AC loads within the inverter's limits. If the intAesrsinstaancletemperature rises to 40ºC (104ºF), the inverter will shut down to protect itself, the meter will automatically return to...

CPI2575_MANL - Page 13

... Low input Notes voltage Recharge battery. C.a.uti.on . Nothing Comes Close to inverter. Reduce load, Notice Caution Warning continuous operation input current required. Low battery alarm Poor DC wiring on all the time Poor battery condition Check connections. Reverse DC polarity Observe correct polarity. W.a.rn.in.g 5V Input voltage 10.4VDC - 14.4VDC Alarm voltage...

CPI2575_MANL - Page 14

... Cobra factory. See customer assistance on the DC input terminals. Please allow approximately three to four weeks before sending your power inverter to you may also have the product serviced... transit. Cobra Electronics Corporation warrants that its option, defective power inverters, products or component parts upon receipt of where the power inverter is utilizedSecondary Icons...

CPI2575_MANL - Page 15

...accessories at your local Cobra dealer, or in the U.S.A., you can be connected to the Remote Jack allowing you to : Cobra Electronics, Attn: Accessories Dept. 6500 West Cortland Street, Chicago, IL 60707 ...p.m. to fax number 773-622-2269. Make check or money order payable to turn the Cobra CPI 2575 inverter on or off from a convenient location when the inverter is installed in an out of reach ...