PEWA EPM3, User Manual

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3
Introduction
The tester provides three functions in one unit, including open phase, phase
sequence and motor rotation indication. This tester is ideal for installing conveyor
lines, pump systems and interconnected drivers.
The EPM3 is two measurement devices. One half measures the phase sequence of
a 3-wire system using the power of the system under test. Using lamp indicators, it
will indicate the 3-phase sequence or it will indicate an open phase situation. The
other half of the EPM3 measures 3-phase motor rotation on an unpowered motor
using the EPM3's internal 9 volt battery. The unit will indicate whether the motor
shaft has clockwise or counter-clockwise rotation.
Features:
•
Identifies 3-phase sequence and open phase check
•
Motor shaft rotation
•
Battery operated
•
Meets EN61010 safety requirements
•
Supplied with three CAT III rated large alligator clips and color coded test leads
XW
Caution
Read all Safety Information before using this tester.
Making Measurements
3-Phase Rotation Test
XW
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.
1. Connect the three color coded test leads to the 3-phase input terminals, L1
(Red) - L2 (Green) - L3 (Blue) also know as A-B-C or R-S-T. See Figure 1.
2. 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.
3. Confirm that all three lights below the test lead inputs on the EPM3 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 EPM3 is defective. Repair or
replace the EPM3 before proceeding.
4. If all three lamps are ON, check the phase rotation indication for the rotation
direction, clockwise (
w
) or counter-clockwise (
x
) indicator.
5. 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.
6 The phase sequence is correct for clockwise (
w
) rotation when the
clockwise lamp is ON and the power source terminals are connected by the
RED, GREEN, and BLUE alligator clips to L1, L2, and L3. Remove power and
label the power source wires.