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Chapter 12Electric Motor Drive Start-up Procedures
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PowerPoint Presentation

Chapter 12

Electric Motor Drive Start-up

Procedures

Initial Checks Secondary Checks

Final Checks

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Electric motor drive voltage is tested at the line power

terminal strip, load power terminal strip, DC bus termin-

al strip, and the control terminal strips.

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A motor and load must be secured in place and

correctly aligned, and the shafts must be rotated to

detect mechanical problems.

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A conductor and motor

winding insulation spot-

test connects a megohm-

meter between a load

conductor and groundand stresses the insula-

tion with a voltage.

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An insulation spot-test

identifies a problem as

either with the conductors

to a motor or the motor

windings.

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An ESD-safe vacuum with accessories is used to

safely remove debris from an electric motor drive.

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A DMM set to measure

resistance is used to

check for grounds in an

electric motor drive.

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A DMM set to the diode

check mode is used to

test the diodes in the

converter section of an

electric motor drive.

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A DMM set to the diode

check function is used to

test the transistors and

fly-back diodes in the

inverter section of anelectric motor drive.

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Power supply voltage to

an electric motor drive is

measured on the line

side of the disconnect

with a DMM.

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The line conductors, grounds, and control wiring mustbe tight and must terminate at the correct positionson an electric motor drive.

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DIP switches or jumpers are used on electric motor

drives to select various functions for a specific

application.

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Overload relays must be sized for the nameplate

current of a motor and are available in a variety of

configurations.

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Power is applied to an electric motor drive after DIP

switches, jumpers, wiring, and overload protection

are set or configured correctly.

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The functionality of an

electric motor drive is

tested by running the

drive without the motor

conductors connected.

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To compare the measured

current reading with the

nameplate current rating

of a motor, the motor must

be operated at a speed of60 Hz.

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The electric motor drive,

motor, and driven load

test verifies that a 4 mA

20 mA signal from a

mixing process providesproper speed reference to

the electric motor drive.

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The operation of a

bypass contactor must

be tested before the

start-up of an electric

motor drive is complete.

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