582
PRACTICAL CIRCUITS
4.14 Start signal (three-wire) holding
(common)
*1
Set [
Pr. 75
= 1] "Reset can be made only when a fault occurs" to disable resetting the inverter during normal operation.
(If the inverter is reset during normal operation, the motor coasts to a stop. This setting is made to prevent the inverter from
resulting in an alarm if the motor is still coasting when the inverter has returned from the reset status.)
*2
The inverter will stop when both terminals STF and STR are closed simultaneously.
*3
During operation, switch-over from "forward rotation" to "reverse rotation" may be made.
In this case, when the reverse rotation signal is turned ON, the regenerative brake is applied down to the forward rotation
frequency of 0.5Hz, the opposite-phase brake is applied at or less than 0.5Hz and acceleration in reverse rotation is started at
that frequency. (DC injection brake is not applied.)
*4
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.
common
Motor
IM
U
V
W
R
S
T
Earth (Ground)
MCCB
Hz
10
2
5
(2)
PB4
RES
STOP
STF
STR
SD
FM
(1)
(3)
MC
*4
*1
Power
supply
(Reset)
Stop
PB3
Forward
rotation
PB1
Reverse
rotation
PB2
Frequency meter
Moving-coil type 1mA
Frequency setting
potentiometer
2W1k
Ω
Related parameter
Reset selection/disconnected PU detection
/PU stop selection [
Pr. 75
]
Inverter
Sp
e
e
d
Change-over from forward
rotation to reverse rotation
Forward
rotation
Deceleration
Acceleration
Reverse
rotation
Time
Opposite-phase brake
Summary of Contents for FR-A700 Series
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Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...
