Mitsubishi Electric FR-A700 Technical Manual page 547

4.13 Operation using the second acceleration/
deceleration time
MCCB
Power
supply
Ready
Stop
F
Middle
speed High speed
FM
FH
F FH
FM
FH
FM
T
1
FH
T
2
FM
(Operation circuit explanation)
1. Using ready, turn ON the
start signal.
2. Press the high speed
pushbutton to make sudden
acceleration only during the
time set to timer T1 and
High speed
perform high-speed
operation.
Middle speed
3. Press the middle speed
pushbutton to make sudden
deceleration only during the
time set to timer T2 and
perform middle-speed
operation.
accel/decel
4. Provide the stop signal to
decelerate the motor to a
stop.
[Pr. 7Acceleration time] (initial setting 5 seconds)
T
1
Relay RT ON
common
(common)
Inverter
MC
*2
R
S
T
T *1
F
C
B
F
F
F
H
R
H
F
M
R
M
T
1
T
2
R
T
F
STF(STR)
SD
RH
RH
RM
RM
SD
RT
Second
RT
*3
time
High-speed operation
Using [Pr. 44],
set second acceleration/
deceleration time
to a value between 0.1 second
and 3600 seconds
Relay RT OFF
Relay RT ON
* 1
U Motor
*2
V IM
W
Earth (Ground)
*3
Function Name
Acceleration time
Deceleration time
Torque boost
Base frequency
[Pr.8 Deceleration time]
Middle-speed
(initial setting 5 seconds)
operation
T2 Relay RT OFF
581
PRACTICAL CIRCUITS
When the power supply is 400V
class, install a step-down
transformer.
When an inverter with
regenerative brake resistor is used
for cyclic or heavy duty operation, it
is recommended to install
magnetic contactor in the primary
side to prevent the brake discharge
resistor from overheat/burnout if
the regenerative brake transistor is
damaged due to the thermal
capacity shortage of the discharge
resistor, and excessive
regenerative brake duty, etc.
Turning ON-OFF the RT signal
changes the manual torque boost
and base frequency to the second
function, in addition to acceleration
and deceleration, as listed below:
Parameters
Selected by
RT signal
OFF
[Pr. 7] [Pr. 44]
[Pr. 8] [Pr. 45]
[Pr. 0] [Pr. 46]
[Pr. 3] [Pr. 47]
Time
a
a
ON
4