34
When setting parameters, refer to the instruction manual (applied) and understand instructions.
Used to set motor acceleration/deceleration time.
Set a larger value for a slower speed increase/decrease or a
smaller value for a faster speed increase/decrease.
Use
Pr. 7 Acceleration time
to set the acceleration time required to
reach
Pr. 20 Acceleration/deceleration reference frequency
from 0Hz.
Use
Pr. 8 Deceleration time
to set the deceleration time required to
stop from the
Pr. 20 Acceleration/deceleration reference frequency
.
If torque is required in the low-speed range (rated motor frequency/
10) under IPM motor control, set the
Pr.791 Acceleration time in low-
speed range
and
Pr.792 Deceleration time in low-speed range
settings
higher than the
Pr.7 Acceleration time
and
Pr.8 Deceleration time
settings so that the slow acceleration/deceleration is performed in
the low-speed range. (Refer to
page 81
for the rated motor
frequency.)
Set the current of the electronic overcurrent protection to protect
the motor from overheat. This feature provides the optimum
protective characteristics, including reduced motor cooling
capability, at low speed.
This function detects the overload (overheat) of the motor, stops the
operation of the inverter's output transistor, and stops the output.
Set the rated current [A] of the motor in
Pr.9
.
(If the General-purpose motor has both 50Hz and 60Hz ratings and
the
Pr.3 Base frequency
is set to 60Hz, set the 1.1 times of the 60Hz
rated motor current.)
When using a motor with an external thermal relay, etc., set “0” in
Pr.9
to make the electronic thermal relay function invalid. (Note that
the output transistor protection of the inverter (E.THT) functions.)
When using a Mitsubishi constant-torque motor
1) Set "1" or "13", "50", "53" in any of
Pr. 71
. (This provides a 100%
continuous torque characteristic in the low-speed range.
2) Set the rated current of the motor in
Pr. 9
.
When the RT signal is ON in a General-purpose motor operation, thermal
protection is provided based on the
Pr. 51
setting.
Use this function when rotating two motors of different rated currents
individually by a single inverter. (When rotating two motors together, use
external thermal relays.)
When the motor has a built-in PTC thermistor, the output can be
input to the terminal 2 and terminal 10. When the input from the PTC
thermistor reaches the resistance setting in
Pr.561 PTC thermistor
protection level
, the PTC thermal error signal (E.PTC) is output and
the inverter trips.
The DC injection brake can be operated at a motor stop to adjust the
stop timing and braking torque.
At a motor stop, DC injection brake operates to apply braking
torque to the motor.
You can set the starting frequency and hold the set starting
frequency for a certain period of time.
Set these functions when you need the starting torque or want
smooth motor drive at a start.
7, 8,
20, 44, 45, 791, 792
Acceleration/deceleration time setting
Pr.7 Acceleration time
Pr.8 Deceleration time
Pr.20 Acceleration/deceleration reference frequency
Pr.44 Second acceleration/deceleration time
Pr.45 Second deceleration time
Pr.791 Acceleration time in low-speed range
Pr.792 Deceleration time in low-speed range
9, 51,
561
Motor protection from overheat
(electronic thermal relay function,
PTC thermistor protection)
Pr.9 Electronic thermal O/L relay
Pr.51 Second electronic thermal O/L relay
Pr.561 PTC thermistor protection level
IPM
IPM
IPM
IPM
IPM
IPM
Running
frequency
Acceleration time
Pr. 7, Pr. 44
Deceleration time
Pr. 8, Pr. 45
Time
Pr. 20
(60Hz)
(Hz)
Output
frequency
Low-speed range
(rated motor frequency/10)
Acceleration time
Slope set by
Pr.7
Deceleration time
Slope set by
Pr.8
Deceleration time
in low-speed range
Slope set by
Pr.792
Acceleration time
in low-speed range
Slope set by
Pr. 791
Time
Output
frequency
(Hz)
V/F
V/F
V/F
GP
MFVC
GP
MFVC
GP
MFVC
10 to 12
DC injection brake of General-purpose
motor control
Pr.10 DC injection brake operation frequency
Pr.11 DC injection brake operation time
Pr.12 DC injection brake operation voltage
10, 11
DC injection brake of IPM motor control
Pr.10 DC injection brake operation frequency
Pr.11 DC injection brake operation time
13, 571
Starting frequency
Pr.13 Starting frequency
Pr.571 Holding time at a start
V/F
V/F
V/F
GP
MFVC
GP
MFVC
GP
MFVC
Operation frequency
Time
Pr. 10
Time
Operation
voltage
Pr. 12
DC injection
brake voltage
Operation time
Pr. 11
(Hz)
Output frequency
Pr.12
Initial
Value
When
Using the
Mitsubishi
Constant
Torque
Motor
3.7K or
lower
4%
5.5K, 7.5K
4%
2%
11K, 15K
2%
If the
Pr. 71
initial value is
changed to the setting for use
with a constant-torque motor, the
Pr. 12
setting changes to the
corresponding value in the above
table.
IPM
IPM
IPM
Pr. 11
Operation time
DC injection brake
is exercised at 0Hz.
Time
Time
DC injection
brake
DC injection
brake
Operation example when DC injection
brake is exercised (
Pr. 11
0)
Motor coasting
Time
Time
Output
frequency
(Hz)
Output
frequency
(Hz)
Operation example when DC injection
brake is not exercised (
Pr. 11
= 0)
Pr. 10
Coasting frequency time
V/F
V/F
V/F
GP
MFVC
GP
MFVC
GP
MFVC
Output
frequency (Hz)
Time
Pr. 13
Pr. 571
setting time
STF
ON
0
60
Setting
range
Содержание F720PJ-11KF
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