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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
h W U l C Y
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 . l k H z
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 W C (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.
-03-
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