The phrase OCV means for Start Routine Volts. It is the unloaded DC voltage that existing at the Weld outcome gadgets of a Welder. This voltage normally earnings between 60-90 VDC in STICK (SMAW) method of operate. The one exemption to this (where an AC voltage is present), it happens when working with a transformer centered STICK Welder (commonly known as a Hype box), which has no DC rectification of the transformers additional voltage. In other ways of operate (Weld processes) such as MIG (GMAW), or TIG (GTAW), the OCV will be different to that specified in STICK method. The weld process that is selected is in accordance with the performance of the welder. Not all welders are able of numerous techniques. For example, easier welders have STICK method of operate only.

When Issues capturing an SCR (Silicon Controlled Rectifier) centered Welder, an OCV statistic provides a useful system towards an efficient fixation. The first thing in this process is to seek advice from the Welders Support Guide. The requirements web page will display the highest possible OCV for the selected weld process and history of this voltage.

Next, seek advice from the plan to expose the variety of SCR’s in the style, and the competent variety of turned existing routes. There is a history of the selection of existing paths! In this scenario, an existing direction is a division from the transformers additional twisting, through an SCR (Anode to Cathode), and concluding into an existing node before filtration by the outcome Inductor (Reactor). The existing node usually has several divisions providing into it with one devoted outcome.

While using a DVM (Digital Voltage Meter) evaluate the OCV of the welder. If it‘s near to the highest possible OCV, so then this indicates that all SCR’s that are shooting (triggered from an used gating voltage) and would be a perfect scenario. If not, split the highest possible OCV by the selection of turned existing routes. This variety symbolizes the volts that each SCR or existing direction provides as part of the style. Deduct this value from the highest possible OCV. If the value (Voltage) is equal to the welders calculated voltage then one SCR or existing direction is defective. If not, so precede this process for the selection of existing routes that are being used.

An example of this is a welder with a highest possible OCV of 60V created by synchronously shooting three SCR’s. The calculated OCV from this welder is only 40V.

60-(60/3) = 40. This would indicate an issue with one of the SCR’s or a leading to issue. As you can see, this process is able of directing the repair specialist, also for Electric Gate Repair, towards a rapid mistake high quality.

Up until this point, the dimensions that have been taken (namely, OCV) happened without starting the welders scenario. The following sections make referrals to element stage and Efficient Analyze techniques. To progress with this, the elements (SCR’s, IGBT’s or MOSFET’s) must be eliminated from the suspicious welder before undertaking these techniques of Electric Gate Repair. For protection factors, under no conditions should the elements being examined be electronically linked with any other gadgets or Energy Provides apart from the Analyze Devices being used to recognize element problems. If you are not knowledgeable in Electric Gate Repair, and don’t have a strong electric qualifications do not effort any kind of electric fix on this kind of apparatus. Within a welder, there are great currents existing that also be can destroy. This caution is not to be taken lightly in other terms, if you are not a certified Electronic devices Specialist, Electric Gate Repairer/Electronics Professional, or Electrical engineer then cure this information as referrals content only. Relate your fix to certified employees.

The SCR’s should then be independently examined out of circuit using an SCR Specialist or Component Analyzer. This kind of Analyzed Devices is able of leading to the Device-Under-Test, but A DVM will not. Another important issue is ESD security of the SCR during this examining stage. Choose Analyze Devices that factors (or connects) all SCR gadgets to the same prospective while finishing Efficient Analyze. If there is no prospective distinction (voltage as an operate of charge) between the SCR’s gadgets, there is no prospective for ESD damage!

When Issues are capturing an Inverter centered welder, a low OCV usually indicates a changing issue with the welders IGBT’s (Insulated Gate The illness Transistor), or MOSFET’s (Metal Oxide Semiconductor Area Impact Transistor). This is normally due to a defective gate car owner or Management Panel. Both of these issues are fixed through board alternative, or element stage fix.

When the calculated OCV is at 0 VDC (and the welder isn’t ruining combines or routine breakers) the changing components should be examined for performance (Out-Of Circuit).

An IGBT & MOSFET Specialist or Component Analyzer should be used to execute these assessments. With the SCR Efficient Analyze Procedure, a DVM cannot gate these gadgets. There are however some exclusions with MOSFET examining due to the top gate feedback capacitance in some gadgets. Also, as formerly stated; a DVM does not offer any stage of ESD security for the element while going through efficient analyze. If a durable, high quality fix is tried, ESD security through Good Analyze devices choice should be a significant issue.