Phase Sequence/Motor Rotation Tester on 3-Phase Motor [IUEC 394]

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This video is part of a larger future series on electric motors and testing but a co-worker needed this tomorrow so I shot this quick video on how to use 3-ph Motor Rotation Meter. More to come.

Most commonly asked about tools can be found here.
Some links are affiliate links in which you pay the same price yet I receive a small commission which helps support my website and channel.

*Note: these are specific notes for a specific elevator gate motor*
Instructions for Travis to ID wires on 2 Speed 3-Phase Motor.
You have 5 wires
Yellow is Common to both High and Low Speeds
2 Black wires for Low
2 Red wires for High
Although you land any color meter leads to wires so long as you stay consistent from Low to High, for simplicity just do as I list below.
- Put the Green Meter Lead to Yellow Motor wire
- Red (M1) Meter Lead to any Red Motor wire then
- Blue (M3) Meter lead to the other Red Motor wire.
Turn Motor CW and if CW LED lights up label the wires Red and Blue or M1 and M3.
Do the same for the Black wires and that way when powered up and running the motor won’t try to reverse direction when changing speeds. Both speeds will be going the same direction even if direction is wrong.
If directions is wrong swap both Red motor wires with each other and swap both Black motor wires with each other.

—

Phase sequence testing is crucial for many three-phase loads. Improperly connected motors can result in reverse rotation, which can damage the equipment powered by the motor. Ensure electrical equipment is correctly and safely connected with Amprobe’s PRM-4 Phase Sequence and Motor Rotation Tester.

Identifies 3-phase sequence and open phase check
Motor shaft rotation indication protected by CAT III circuitry
3 phase to phase input voltage, 100V ac to 600V ac max
Supplied with three CAT III rated color coded large alligator clips and test leads
45 to 70 Hz frequency

Phase sequence meter (rotation meter) is used for detecting the sequence of the supply in three-phase electric circuits. Since the direction of rotation of three phase electric motors can be changed by changing the phase sequence of the supply. And also the correct operation of measuring instruments like 3 phase energy meter and automatic control of devices also depend on the phase sequence. Different types of phase sequence testers are available in today’s market like contact or non contact, static or rotating, etc., in a wide range of voltage or power ratings. What is phase sequence?
The sequence in which three phase voltages attain their positive maximum values is defined as the phase sequence. It refers to the relation between the voltages or currents in three phase system. Consider the three phases as red-R, yellow-Y and blue-B phases.

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[KTFG]

This video is part of a larger future series on electric motors and testing but a co-worker needed this tomorrow so I shot this quick video on how to use 3-ph Motor Rotation Meter.

Newer Version


Want more tutorials like this? You can help support this channel by Subscribing, hitting Like & Commenting.

Most commonly asked about tools can be found here.
Some links are affiliate links in which you pay the same price yet I receive a small commission which helps support my website and channel.


*Note: these are specific notes for a specific elevator gate motor*
Instructions for Travis to ID wires on 2 Speed 3-Phase Motor.
You have 5 wires
Yellow is Common to both High and Low Speeds
2 Red wires for Low
2 Black wires for High
Although you land any color meter leads to wires so long as you stay consistent from Low to High, for simplicity just do as I list below.
- Put the Green Meter Lead to Yellow Motor wire
- Red (M1) Meter Lead to any Red Motor wire then
- Blue (M3) Meter lead to the other Red Motor wire.
Turn Motor CW and if CW LED lights up label the wires Red and Blue or M1 and M3.
Do the same for the Black wires and that way when powered up and running the motor won’t try to reverse direction when changing speeds. Both speeds will be going the same direction even if direction is wrong.
If directions is wrong swap both Red motor wires with each other and swap both Black motor wires with each other.


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[qzorn]

I wonder if this would work on the larger 2, 300vac 3 phase motors? 😎 Thank you.

[boatbikeandbeyond]

I coming to ATL with the RV and tow car. When you're finished with this video don't put away your testers! :-) I have a few ideas!

[johanburger]

Hey mate, nice video. I'm assuming that you have to test phase sequence of the supply before connecting up to the motor. This is to ensure if the supply is clock wise L1 L2 L3 then connecting L1 L2 L3 to U1 V1 W1 respectively would give you a clockwise rotation? Let me know thanks

[Xxxcappie]

So it matters what lead you clamp to which wire...what if the leads from the motor are not marked and you don't know what they are. How would one go about working blind ?