Recent content by MKSJ

You want to replace the motor with the same type "1750 RPM, 4 pole," a 3600 RPM wouldn't make any sense and will be noisier. The motor starter contactor should have a current rating indicated on the model information, given that the overload relay range is listed as 9-27A, the contactor must be...

Yes and no, a VFD parameters and motor tuning are specific to an individual motor, most lower cost (cheap) VFDs only can be setup for one motor/machine. Some more expensive VFDs allow two sets of motor parameters to be used, and a programmed input is used to switch the motor parameters (but not...

Yes the aPower 2 batteries and inverter are weatherproof, completely sealed units with back fins on the inverters. The batteries face east and are shaded most of the day. This is an AC coupled system with no central DC to AC inverter as in the Sol-Ark. The battery units are modular 15 kWh usable...

So having looked and installed battery backup system recently and also a friend with who went with the Sol-Ark system and EG4 battery cabinet, there are a few things to consider. I am not outlining this as an installer but a knowledgeable homeowner who has reviewed some of the power backup...

If you have a 3 phase input VFD, it is not well defined what the input current rating is when running on single phase in derated mode. You still need to comply with the NEC input wiring requirements if there isn't a plug to attached to the VFD but what input current are you using. An example in...

Last person I know bought HY VFDs for his compressor, the first two failed and one actually caught fire. Piston compressors are a very hard start, so you need some headroom in the VFD running capacity (output amps in constant torque in HD mode as well as short term overload). When also asking...

Derating for a 3-phase input VFD's is specific to the manufacture’s specifications, not just a simple formula or number. It also needs to take into account the machine load (variable torque, vs fixed torque, ND or HD, etc.). Derating is also affected if there is an input reactor and/or buss...

One feature that I have used on my Fluke is the LoZ for eliminating phantom AC readings, haven't seen that on the other multi-meters listed. Temperature probe is too inaccurate for air-conditioner work. If you do not need the LoZ then might look at the AstroAI Digital Multimeter 10000, at $39...

I just purchased the TEKTON 1/4" Drive Dual-Direction Click Torque Wrench (10-150 in.-lb.) TRQ21101, mostly for electrical fittings and small fasteners. Seems to be very good quality for the price ($50), it is made in Taiwan, all metal construction and a fine pitch ratchet. It is calibrated and...

It depends on many factors, piston vs. scroll/rotary, splash vs. pressure/filter lubrication, ambient temperature/humidity, run time, etc. A standard reciprocating using mineral oil, the typical change interval oil is around 200 hours. Switch that to a full synthetic and the interval is in the...

So you need to look at the schematic for the Ironworker, some can be wired for 230/460V, so you may be able to rewire it for the lower voltage. Also how it operates, I did look at Piranha P65 as an example, the control system operates off of a single phase transformer, so you could pass through...

Rated extension cords have plugs to match their wire ratings, I use a 50A welding extension cord with a molded plug. The wall receptacle is rated at 50A and it is wired with #6 Romex to a 50A breaker. A 5 Hp single phase motor FLA is between 22-27A, a SF is 1.25 and is only a short term load so...

I have a Champion HR5-8 compressor, it came with a magnetic starter. The starter carries the motor carrying current, the pressure switch just connects the power to the pressure switch which operates only the contactor. A magnetic starter with a thermal overload like in the eBay link takes care...

Mitutoyo Quantumike Micromters and Mitutoyo 500 Calipers, as well as others. Resolution wise I have seen older micrometers that have similar accuracy, but were very expensive in their time and probably not as robust in a harsh work environment. I also have Igaging Absolutes in both and also had...

If you have it on a dedicated breaker, then you would not need fusing. Technically NEC specifies that the breaker wiring minimum is 125% of the input current of the VFD, as I mentioned I have not seen anything to how this applies to a 3 phase input VFD being run on single phase. Per Fuji the...