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Muthu As long as an external blower is operating, the motor should not overheat with rated field current. Does the blower operate 24/7? The overheating will happen if there is full field current and no air flowing through the motor.

Was field economizing on in the DC Drive? Many DC motors will over heat if the motor is stopped for an extended time with the full field current applied to it. Most DC Drives have a field economizing function which reduces the field current when the motor is stopped. It can usually be enabled...

If the cable has a J in the type, it is only rated for 300 volts.

Bill The two speeds shown on the nameplate are for 60/50 Hz operation.

Gunnar Thanks for doing this. Out of curiosity, was the microwave clock keeping the correct time with this waveform?

Thanks for the replies. I wasn't looking for a fix for the problem, he doesn't use the generator that often so he just adjusts the run time to compensate for the fast clock. I was more interested in the reason why this was happening. I think it is probably a combination of the distorted...

My son bought a cheap, 5kw no name brand Chinese made generator to power his RV when not connected to utility power. The generator is a true AC generator, not an inverter. If he runs only the microwave from the generator, the clock/timer on the microwave runs too fast, about twice normal...

The catalog I was referring to is the 2014 ATV61 e-catalog. The diagram showing the motor choke between the drive and motor is on page 1/83. Here is a link to the catalog Link

You are getting bad information from Tech support. There is no confusion in the Schneider documents. Any reference to line chokes in the Installation Manual clearly shows the choke installed in the incoming line before the drive and states the choke is required if the available short current...

If you look in the ATV61 Installation Manual in the Wiring Recommendation Section, you will see a table showing recommendations for different motor cable lengths. For your drive, a "Motor Choke" is recommended for cable lengths more than 100m (328 ft.). Do as jraef recommended and install a...

The DPDT switch cannot be used for starting and stopping the motor, only for selecting the direction. You will need a separate switch (Footswitch) to start and stop it. The reversing switch should be a 2 position, maintained, DPDT switch.

jraef I would be interested in seeing the specification which prohibits using a MCP with a VFD. I am particularly interested in the CSA specification. Can you provide me with any references? Thanks

What is the setting of the Motor Control Type parameter. The default setting in a ATV61 is Energy Saving which is not good for your type of load. I have seen high currents when using this setting on certain types of loads. Set Motor Control Type to SVC V (open loop voltage flux-vector) and run...

This is commonly known as a regeneration (regen) fault. When the motor is regenerating (braking), DC current is flowing from the motor into the power lines. The AC line voltage reverse biases the SCRs at the appropriate time to turn them off. When the AC voltage is suddenly removed, there is...

Be careful when selecting a UPS for a PLC. Many cheap UPS's will not give any protection against voltage dips. Allen-Bradley's PLC-5 power supplies are rated at 97-132 Volts. The PLC processor will stop at 95-96 volts. I have verified this by connecting a Variac to the PLC and turning down the...

You didn't say if you had a 8 or 16 Amp power supply for the rack but a 250 VA transformer should be more than enough for either power supply.

Install a Constant Voltage Transformer on the 120 Volt supply to the PLC. We install a Sola CSV Series transformer on every PLC we install in a sawmill. Only the PLC power supply needs the transformer, not the power to the I/O. More information is available at...

Could someone please post a link to a complete list of different types of protective relays and the applicable ANSI codes. A brief description of the function of the relay would also be helpful. A search with Google did not produce what I am looking for. Thanks

I have always specified Delta/Wye connected transformers for DC Drive Isolation applications. All transformer manufacturers, that I am aware of, also specify Delta/Wye connected transformers for this application. I recall hearing that this connection cancels some of the harmonics generated by...

What is your single phase voltage? Assuming you have 230 volts single phase, a phase converter would convert 230 volts single phase to 230 volts 3 phase. This would run your 230 volt motor. A 230/575 volt, 3 phase transformer would give you the 575 volt, 3 phase you need. Check this website...