testing motor direction
testing motor direction
(OP)
I have been asked a question on motor rotation dose anyone know of a test the can tell the direction a motor will rotate when it is conected to a 3 phase supply with a known phase rotation (motor leads not marked)the question was asked to aviod starting large drive the wrong direction when connected to gear boxes with roll back protection





RE: testing motor direction
RE: testing motor direction
RE: testing motor direction
RE: testing motor direction
Quoting from the website data :
"....Phase Rotation Tester permits the electrical contractor or industrial maintenance electrician to permanently connect and tape the terminals of the motor being installed, without having to first energize the motor by a temporary hookup from a power source, if available, to determine motor rotation. Therefore, the test set eliminates the need for temporary connections that can be time consuming, costly and quite hazardous, particularly where many large, high-voltage motors are involved.
"Also, certain types of drives should never be rotated in the wrong direction. In such cases, the temporary hookup or trial method, having a fifty-fifty chance of being wrong, can do serious harm."
RE: testing motor direction
RE: testing motor direction
If the supply phase sequence is required, it is determined by using the meter up to 600V. If the circuit voltage exceeds this value, then voltage transformers are needed to utilise the meter - note that this is a standard practical test used for determining phase sequence at any voltage. If the circuit does not include VTs, then a temporary installation is needed.
RE: testing motor direction
And are they available for d.c motors.
RE: testing motor direction
http://www.avointl.com/products/rotating/rotate.html
for AVO International product by clicking on Motor and Phase Rotation Tester and accessing *.pdf file containing Specs