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...
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...
