Mitsubishi Electric FR-A700 Technical Manual page 543

4.9.2 Use of brake sequence circuit function
MCCB
Power
supply
T
F
Ready
"ON"
"OFF"
PB
PB
MC
RA
Forward rotation
Reverse rotation
High speed
Low speed
Brake operation signal
• At start: When the start signal is input to the inverter, the output is provided at the starting frequency, and when the
given frequency [Pr. 278] is reached and the output current exceeds the current set in [Pr. 279], the brake
opening request signal BOF is output.
When the given time set in [Pr. 281] has elapsed after the brake opening completion signal BRI has been input,
the output frequency is raised to the preset speed.
• At stop: When the speed is reduced to the brake operation frequency [Pr. 282], the brake opening request signal BOF is
turned OFF. When the given time set in [Pr. 283] has elapsed after the brake opening completion signal BRI
had been turned OFF, the output frequency is switched OFF.
*1 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, e.g. in orientation. Also, as there
is a limit to the braking capacity, run the motor at no more than 60Hz.
*2 When the power supply is 400V class, install a step-down transformer.
Inverter
MC
R
S
T
*2
C
M
B
C
B
R
STF
STR
RH
RL
BR
BRI
RES
Reset
SD
A700 E700
(A700)
BR
Brake
B
U
V IM
W
Earth (Ground)
24VDC
power supply
+24 V 0V
R
BOF
A
SD
Related parameters
Automatic acceleration/deceleration
Brake opening frequency
Brake opening current
Brake opening current detection time
Brake operation time at a start
Brake operation frequency
Brake operation time at stop
Deceleration detection function selection
Overspeed detection frequency
577
PRACTICAL CIRCUITS
Motor
[Pr.292]
[Pr.278]
[Pr.279]
[Pr.280]
[Pr.281]
[Pr.282]
[Pr.283]
[Pr.284]
[Pr.285]
4