Mitsubishi Electric FR-A700 Series, Техническое руководство, Страница: 547 / 550

581
4
P
RACTICAL CIRC
UI
T
S
PRACTICAL CIRCUITS
4.13 Operation using the second acceleration/
deceleration time
(common)
* 1 When the power supply is 400V
class, install a step-down
transformer.
*2 When an inverter with a
regenerative brake resistor is used
for cyclic or heavy duty operation, it
is recommended to install a
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.
*3 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:
Function Name
Parameters
Selected by
RT signal
OFF ON
Acceleration time [ Pr. 7 ] [ Pr. 44 ]
Deceleration time [ Pr. 8 ] [ Pr. 45 ]
Torque boost [ Pr. 0 ] [ Pr. 46 ]
Base frequency [
Pr. 3
] [
Pr. 47
]
common
IM
U
V
W
R
S
T
MCCB
T
F
F
C
B
F
FM
F
FH
F
FH
FM
FH
FM
FH
FM
T
1
T
2
STF(STR)
F
SD
RH
RH
RM
RM
SD
RT
RT
MC
*2
*1
*3
Inverter
Motor
Earth (Ground)
Power
supply
Stop
Ready
Middle
speed High speed
High speed
Middle speed
Second
accel/decel
time
(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
perform high-speed
operation.
3. Press the middle speed
pushbutton to make sudden
deceleration only during the
time set to timer T2 and
perform middle-speed
operation.
4. Provide the stop signal to
decelerate the motor to a
stop.
F
H
R
H
F
M
R
M
T
1
T
2
R
T
[ Pr. 7Acceleration time ] (initial setting 5 seconds)
T
1
T2
[ Pr.8 Deceleration time ]
(initial setting 5 seconds)
O
u
tput fr
equ
enc
y
Relay RT ON
Relay RT OFF
Relay RT ON
Relay RT OFF
Time
Middle-speed
operation
High-speed operation
Using [ Pr. 44 ],
set second acceleration/
deceleration time
to a value between 0.1 second
and 3600 seconds