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Rockwell Automation RELIANCE ELECTRIC SP500 - Multiple-Motor Applications 2.0.0

Rockwell Automation RELIANCE ELECTRIC SP500
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3.5.2
If
the
motor
will
be
operated
below
one-half
of
its
rated
speed,
the
motor
overload
relay
may
not
protect
the
motor
because
of
reduced
cooling
action
due
to
the
reduced
speed.
A
motor
thermostat,
internal
to
the
motor,
should
be
installed
to
monitor
the
actual
temperature
of
the
windings.
Multiple-Motor
Applications
One
drive
can
run
two
or
more
motors.
Adhere
to
the
following
requirements
to
assure
correct
drive
operation
in
this
case:
*
When
starting
and
stopping
all
the
motors
at
the
same
time
(using
the
drive
for
starting
and
stopping),
the
sum
of
the
full-load
sine
wave
currents
of
all
the
motors
must
be
equal
to
or
less
than
the
maximum
sine
wave
output
current
at
the
selected
carrier
frequency
for
the
drive.
For
example:
IFLA
+
IFLA
+
IFLA
=
ITLA
(Motor
1)
(Motor
2)
(Motor
3)
(Total
Load)
Where:
lq_a
<100%
rated
drive
output
at
the
selected
carrier
frequency
*
When
one
or
more
of
the
motors
connected
to
the
output
of
the
drive
are
to
start
independently
(using
a
secondary
switching
device
to
add
or
remove
the
motor
from
the
circuit):
Any
motor
that
starts
or
stops
while
the
drive
is
running
must
have
a
current
rating
less
than
10%
of
the
maximum
sine
wave
current
rating
of
the
drive
at
the
selected
carrier
frequency.
The
sum
of
the
maximum
full-load
sine
wave
currents
of
all
the
motors
connected
continuously
to
the
drive
must
be
less
than
the
maximum
output
current
rating
under
all
conditions.
Note
that
each
motor
requires
separate
thermal
overload
protection
(for
example,
a
motor
relay
or
a
motor
thermostat).
3-10
SP500
AC
Drive
Installation
and
Operation
Manual
Version
3.1

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