Mitsubishi Electric Freqrol-A100 Instruction Manual page 85

Pr. 8
-
Pr. 12
(2) Setting of deceleration time
In deceleration time (Pr.
8),
set a period of time required
Running
to reach OHz from the accel-
frequency
erationldeceleration refer-
ence frequency (Pr.'20). Set
.-
a longer time to decelerate
more slowly, and a shorter
time to decelerate more rap-
idly. (Note)
Motor overheat protection
I
4
Time
D e c e l e r a t ~ o n m
Note: When the set value of Pr.
8
is "0" the deceleration time is set to 0.04
seconds.
Model
7.5K
and down
1 1 K
and
up
0
Pr. 9 "electronic overcurrent protection"
The set value for motor overheat protection may be set as a
current value (A). Normally set the rated current value of the
motor at 50Hz. This function provides an optimum protective
characteristic including a reduction in motor cooling capability
in low-speed operation.
Setting of "0" makes the motor protective function invalid. (The
inverter output transistor protective function is valid.)
When Mitsubishi's constant-torque motor is used, set "1" in Pr.
71 "applied motor" to select the 100% continuous torque char-
Factory Setting
5
seconds
15 seconds
acterktic in the low speed range, and set the rated motor current
in Pr. 9 "electronic overcurrent protection".
Setting Range
0 to 3600 seconds 1 0 to 360 seconds
0 to 3600 seconds 1 0 to 360 seconds
Factory setting of Pr. 9 ...... [rated output current of the inverter]
Note: When two or more motors are run simultaneously, provide a thermal
relay for each motor.
Pr. 10 "DC injection brake operation frequency", Pr. 11
0
"DC'injection brake operation time", Pr. 12 "DC injection
brake voltage"
X
Setting the stopping DC injection
!
brake voltage (torque), operation
time and operation starting fre-
quency allows the stoppi t i g accu-
ration
racy of positioning operation, etc.
.
.-
0
1
Tb
frequency
to be adjusted according to the
.ST
%' ; ."?
Time
load.
o x
0
2
<When load is large>
Operation Time
Set a short time in Pr. 11 "DC injection brake operation time".
Set a large value in Pr. 12 "DC injection brake voltage".
<When load is small>
Set a long time in Pr. 11 "DC injection brake operation time".
Set a small value in Pr. 12 "DC injection brake voltage".