Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 530 / 550

564
PRACTICAL CIRCUITS
4.3 Motor equipped with brake
(common)
*1 When stopping the motor equipped with electromagnetic brake, use the output stop terminal signal(MRS) of the inverter. A
failure to do so causes a lock current to flow in the motor when the brake is applied, and OCT may occur.
*2 The above caution must also be taken when using any other mechanical brake.
*3 When the motor equipped with a brake is run at or less than 30Hz continuously, the brake disc may rattle but the motor may be
used without any problem if it is run at low speed for a short period, for example. in orientation. Also, as there is a limit to the
braking capacity, run the motor at no more than 60Hz.
*4 In this circuit, pressing the stop button stops the motor with the electromagnetic brake. For operation of the electromagnetic
brake after the motor is decelerated by the inverter, refer to page 576.
*5 When the power supply is 400V class, install a step-down transformer.
*6 When using an external brake resistor or brake unit, remove the jumper from across PR-PX.
(
7.5K or less only. Not available for .
Do not use PR and PX terminals for the . Do not remove the jumper connected to terminal PR and PX.)
U
V
W
R
S
T
10
2
5
MCCB
T *5
F
BR
B
MC
M
C
F
R
B
R
Hz
FR-BU2 FR-BR
B C TH1 TH2
IM
Reset
PB6
*1 BR
PB2 PB1
MC
MC
PB5
PB3 R
F
PB4
F
R
R
F
R
F
C
B
FM
SD
STF
STR
P
N
P
PX
PR
RES
SD
MRS
*6
P
N
PR PR
P
A
B
C
TH1
TH2
R
*4
THS
Power
supply
Brake
unit
Resistor
unit
Stop
Forward
rotation
Reverse
rotation
Frequency setting
potentiometer
2W1k
Inverter
*3
Brake
Motor
Ground
When FR-BU2 brake unit is used
Brake unit
FR-BU2
Resistor unit
FR-BR
External discharge resistor
for regenerative brake
Frequency meter
Moving-coil type 1mA
A700
When regenerative brake duty is large
(22K or less)
E700
(0.4K to 15K)
"OFF"
"ON"
Ready
D700
common
A700 E700 D700
F700