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3.4.4
Type CPCR-MR[-]CL
and Type JESP-PT[-]L
(3)
Types
CPCR-
MR55C
to -MR99C:
JL<2JM
Application
If load inertiaexceeds the above values, contact
For
continuous
running
of Servopack,
the load
your
Yaskawa
representatives
for types
CPCR-
MR-08C
the available
range
of load inertia is
conditions
must
be checked
thoroughly.
Special
max
five times of motor
inertia by
using
regene-
care is needed
for application
to an operation
mode
rative unit.
(Refer
to Par.
3.8.2.)
in which
the load varies
and the Servopack
continr
uous
output
current
is exceeded
(except
for
overload
due to start and stop) , or where
the motor
locking
current
may
continue
for 1 second
or longer
3.4.7
Motor
Overload
Protection
when
the motor
is locked
due
to machine
trouble.
In such an application, use Servopack
type CPCR-
If a motor runs continuously under overload, motor
MR[_]CL
or type JESP-PT
[_-] L with the overload
coilmay burn
out.
To protect the motor, use a
detecting
function
to prevent
trouble
made
by
thermal
overload
relay
that matches
the thermal
exceeding
Servopack
overload
capability,
characteristic
of the motor.
Make
sure to connect
The protective circuit detecting level is set
the specified thermal overload relay as shown
in
under
condition
of a motor
locked
during
motor
Figs.
2.1 to 2.5.
Make
a sequence
circuit so that
running,
and therefore
the safety factors and
the main
circuit power
is turned
off when
the
allowable
conduction
times are different
for each
thermal
overload
relay operates.
Servopack.
See Fig. 1.2 (a) to (h).
For Minertia
Motor
J series,
the thermoguard
Servopack
operates
at an early time for frequent
may
be contained
in the motor
as an optional.
In
start and
stop
application
in this set level•
In
this case,
the contact
of the thermal
overload
re-
application,
thorough
consideration
is necessary
lay is connected
in series to the contact
of the
for the value
to be set.
Note
that the thermal
thermoguard
(Fig. 3.19).
Note
that the thermal
overload
relay
for motor
overload
protection
does
overcurrent
relay is not attached
to the motor
not protect
all the overload
characteristics
of Ser-
and
must
be procured
separately.
vopack.
3.4.5
Special
Power
Voltage
THERMAL OVERLOAD R ELAY
Where
the supply voltage is 400 or 440V,
it is
lit
necessary to charge power supply
transformer,
i_
Ac_--°le
The transformer is available on order.
SERV0PACK
( r'l
THERMOGUARD
(2) Types
CPCR-MR08C
to
-MR99C
Bk_(CO2TBACT CAPACITY: 2 00V. IA)
For
power
voltage
of 400 V
class,
a transformer
must
be added.
In such
a case,
contact
the
Fig. 3.19
Minertia
Motor J Series
Overload
Protection
company•
Single-phase
power
of i00 V class cannot
be used.
3.4.6
Load Inertia
Type
CPCR-MR_-]C
has
a limit in its regenerative
control
capability
and
therefore
the
load
inertia
is restricted.
When
the motor
speed
is constant,
the regenerative
energy
of the motor
is propor-
tional
to inertia.
The
allowable load inertia converted
to the
motor shaft isas follows:
(i) Types
CPCR-MR01C
to -MR07C
• Print Motor
standard
series (PM)
Minertia
Motor
standard
series (MM)J _ JL < 3JM
• Cup
Motor
• Hi-Cup Motor
JL < 2JM
• Minertia
Motor
J series
(2) Types
CPCR-MR08C
to -MR22C:
JL < 3JM
32
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