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Before proceeding read Section 1 1 on Electrical Safety. Failure to
follow the instructions in Section 1 1 could result in serious personal
injury, death and/or property damage
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Check power supply to make certain that voltage, frequency and
current carrying capacity are in accordance with the motor
nameplate. Failure to match motor nameplate values could result in
serious personal injury, death and/or property damage
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Motor and control wiring, fusing, overload protection, disconnects,
accessories and grounding must always conform to the applicable
electrical codes as well as local codes and sound practices.
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to a motor should include a
disconnect switch, short circuit current fuse or breaker protection,
motor starter (controller) and correctly sized thermal elements or
overload relay protection.
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Short Circuit Current Fuses or Breakers are for the protection of the
branch circuit. Starter or motor controller overload relays are for the
protection of the motor. Each of these should be properly sized and
installed per the applicable electrical codes as well as local codes
and practices.
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DO NOT bypass or disable protective devices. Protection removal
could result in serious personal injury, death and/or property
damage
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Motors are designed to operate within the following limits at the
motor terminals:
1
AC power is /
10 % of rated voltage with rated
frequency applied. (Verify with nameplate ratings)
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AC power is / 5% of rated frequency with rated voltage
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3
A combined variation in voltage and frequency of +/ 10% (sum
of absolute values) of rated values, provided the frequency variation
does not / 5% of rated frequency.
4
For 3 phase motors the line to line full load voltage must be
balanced within 1%.
5
If the motor is rated 208 230V, the voltage deviations must be
calculated from 230V.
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Operation outside of these limits will degrade motor performance
and increase operating temperature.
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For ease of connections,
motors are typically provided with large terminal boxes. Most motors
have conduit access in 90 degree increments, the terminal box
conduit opening is typically provided via knockouts, holes with
covers, or the terminal box is rotate able. Fabricated conduit boxes
may have a removable plate for the installer to provide correctly
sized hole(s).
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: If a
pipe nipple mounted terminal box is removed or rotated it must be
reassembled with a minimum of five full threads of engagement.
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its machined surfaces. Prior to component reassembly wipe clean
all machined surfaces.
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The gap between mating surfaces with the machined
terminal box MUST BE LESS THAN 0.002 inches. This gap must
be checked with a feeler gage along the entire perimeter. If there is
visible damage to the mating surfaces, or if the gap between these
surfaces exceeds 0.002 inches, DO NOT complete the installation
and contact the motor manufacturer.
Failure to follow these
instructions could result in serious personal injury, death and/or
property damage
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Electrical connections to be made per nameplate connection diagram
or separate connection plate. In making connections follow the
applicable electrical code as well as local codes and practices.
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Failure to correctly connect the motor leads and grounding
conductor can result in injury or death. Motor lead connections can
short and cause damage or injury if not well secured and insulated.
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The minimum wire size for Single Phase, 115 & 230 Volt Circuits
must meet table 3 8 for a given distance between motor and
either Fuse or Meter Box.
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Where an extension cord(s) is utilized to provide power to the
motor the extension cord(s) must be…(1) the proper gauge size
per table 3 8, (2) in good working condition (3) properly
grounded.
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For general information on grounding (USA) refer to NEC Article 250.
Improper grounding of an inverter fed motor may result in frame
voltages in excess of 500 Volts. In making the ground connection,
the installer must make certain that a good electrical connection is
obtained between motor and grounding lead. Failure to properly
ground motors, per the applicable national code (such as NEC Article
430) and local codes may cause serious injury or death to personnel.
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A grounding conductor must be
connected to the grounding terminal provided in the terminal housing.
This grounding terminal is either a ground screw, ground lug, or a
tapped hole to be used with a separately provided ground screw. The
internal grounding feature is accessible inside the terminal housing
and must be used as the primary grounding connection.
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Some motors are provided with a
supplemental grounding terminal located on the external surface of
the motor frame or feet. This external terminal is for supplemental
bonding connections where local codes permit or require such
connection
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Be certain that all connections are secure and the conduit box cover
is fastened in place before electrical power is connected. Failure to
follow these instructions could result in serious personal injury, death,
and/or property damage.
