EMD12 (1)
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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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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
An insulation spot-test
identifies a problem as
either with the conductors
to a motor or the motor
windings.
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Chapter 12Electric Motor Drive Start-up Procedures
An ESD-safe vacuum with accessories is used to
safely remove debris from an electric motor drive.
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Chapter 12Electric Motor Drive Start-up Procedures
A DMM set to measure
resistance is used to
check for grounds in an
electric motor drive.
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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
Power supply voltage to
an electric motor drive is
measured on the line
side of the disconnect
with a DMM.
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Chapter 12Electric Motor Drive Start-up Procedures
The line conductors, grounds, and control wiring mustbe tight and must terminate at the correct positionson an electric motor drive.
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Chapter 12Electric Motor Drive Start-up Procedures
DIP switches or jumpers are used on electric motor
drives to select various functions for a specific
application.
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Chapter 12Electric Motor Drive Start-up Procedures
Overload relays must be sized for the nameplate
current of a motor and are available in a variety of
configurations.
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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
The functionality of an
electric motor drive is
tested by running the
drive without the motor
conductors connected.
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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
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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Chapter 12Electric Motor Drive Start-up Procedures
The operation of a
bypass contactor must
be tested before the
start-up of an electric
motor drive is complete.
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