-
,
_.
,.l.l
._
.
..-
..
-
.
.
.
.
.
.
.I.
..
..
..
.
,..”..
.
,
,
22.
PARAMETERS
Pr.70
-
Pr.72
0
When a Mitsubishi constant torque motor is used,
set ‘1” for Pr.71 independent of the control type
(V/F control, general-purpose magnetic flux vec-
tor control). The thermal characteristics of the
electronic thermal relay are set for the constant
torque motor.
Note 1. Select the inverter capacity carefully as the constant torque motor output current is
larger than
of
the standard motor.
2. When
two
or more constant toque motors are run synchronously, they are liable to
cause torque imbalance because of their smaller slip than the standard motors.
__
d
CAUTION
A
Set this parameter correctly according to the motor used. Incorrect setting may cause the
motor to burn due to overtteat.
Chmglng
th.
PWY
=niW
hWUlCY
It is possible to charge the noise level
of
the motor b
Factory-setting
...
1kHz (not low-noise opera
0
By changing the setting
of
Pr.72, operation nolse
is influenced as indicated in the table at the right.
0
During the operation of the inverter, the change
or writing
of
the set values is restricted to either
of
the following ranges.
(1) 0.7kHZ to l.lkHz
f2)
1.2kHz to 14.5kJ-k
the setting
of
Pr.72.
possible.
The chanae or writing of the set values
beyond
the individual ranges is not permitted.
\,
Notes:
1.
If
the inverler is operated by setting a value larger than 2kHz for Pr.72 while am-
bient temperature
is
higher than
WC
(104‘F),
it is necessary to reduce
the
rated
output
current
of
the inverter (Refer to page 11 7).
2.
If
PWM carrier frequency is increasd, noise and leak current will increase. There-
fore, proper measures must
be
taken (Refer
to
page 110.)
0
If
the mechanical system vibrates abnormally due to resonance, vibration might be reduced by
changing the setting
of
Pr.72.
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