Amprobe PRM-4 Manuale d'uso - Pagina 8

Sfoglia online o scarica il pdf Manuale d'uso per Strumenti di misura Amprobe PRM-4. Amprobe PRM-4 14. Phase sequence and motor rotation tester

MAkINg MEASUREMENTS

�� Caution

This instrument only indicates that voltage is present, not the

voltage level. Verify the actual voltage with a multimeter. Using the

wrong voltage can damage a motor.

Connect the three color coded test leads to the 3-phase input

terminals, l1-l2-l3 also know as A-B-C or R-S-T. See figure 1.

Connect the three color coded alligator clips to the terminals of

a 3-phase power source. The connection order is optional. Use

extreme caution in this high voltage situation.

Confirm that all three lights below the test lead inputs on the

PRM-4 are on. if one or more of the three lights is off, there is an

open phase condition. Correct the power source problems before

proceeding (See open Phase Test later in this manual). if the open

Phase tests are good, the PRM-4 is defective. Repair or replace the

PRM-4 before proceeding.

if all three lamps are on, check the phase rotation indication for

the rotation direction, clockwise (�) or counter-clockwise (�)

indicator.

if the counter clockwise lamp is on, reverse the connections of any

two of the three alligator clips for clockwise rotation. Use extreme

caution in this high voltage situation.

The phase sequence is correct for clockwise (

the clockwise lamp is on and the power source terminals are

connected by the alligator clips to l1, l2, and l3. Remove power

and label the power source wires.

�� Caution

The multimeter used for this test should be properly rated for the

circuit under test.

Connect a multimeter (set to VAC and the voltage range expected)

V input to the phase wire in question and the CoM input to

neutral or ground to check the phase voltage. Use extreme

caution in this high voltage situation.

Verify that the two other phases are working properly and that

the 3-phase to phase voltages are correct. if a problem is found,

�) rotation when