Mitsubishi Electric FR-A700 Technical Manual page 366

(1) Setting of brake sequence function
For , select one of Real sensorless vector
A700
control, vector control (speed control), and Advanced
magnetic flux vector control. For
Advanced magnetic flux vector control or General-
purpose magnetic flux control. This function is invalid
during V/F control.
The brake sequence function is valid only when the
External operation mode, External/PU combined
operation mode 1 or Network operation mode is
selected. When brake sequence mode is selected,
automatic restart after instantaneous power failure is
invalid. In addition, set acceleration/deceleration time
to 1s or more.
Set [Pr. 292 = 7 or 8] (brake sequence mode). To
ensure more complete sequence control, it is
recommended to set [Pr. 292 = 7] (brake opening
completion signal input) .
Set [Pr. 178 to Pr. 189 (input terminal function selection =
15] and assign the brake opening completion signal
(BRI) to the input terminal.
Set "20 (positive logic) or 120 (negative logic)" in any
of [Pr. 190 to Pr. 196 Output terminal function selection]
and assign the brake opening request signal (BOF)
to the output terminal.
Even if brake sequence function is selected, inputting
the JOG signal (JOG operation), RT signal (second
function selection) or X9 signal (third function
selection) during an inverter stop will switch to the
normal operation and give priority to JOG operation
or second and third function selection. Note that JOG
and RT signal input is invalid even if JOG signal and
RT signal are input during operation by brake
sequence function.
When PID control or load torque high speed
frequency control is selected, brake sequence
function is invalid.
Sink logic
[Pr.184 = 15]
[Pr.190 = 20]
MCCB
Power
supply
Start signal
Multi-speed signal
Brake opening completion signal
(BRI)
*1 The input signal terminal used differs according to
the [Pr. 178 to Pr. 189] settings.
*2 The output signal terminal used differs according
to the [Pr. 190 to Pr. 196] settings.
*3 The current should be within the permissible
current of transistor in the inverter. (24V 0.1ADC)
, select
E700
MC
Mechanical
brake
R/L1 U
S/L2 V Motor
T/L3 W
24VDC
Brake opening
STF
request signal
RH (BOF)
MC
*2
*3
RUN(BOF)
RL(BRI) *
1
SD SE
400
(2) With brake opening completion signal
input [Pr. 278 to Pr. 283, Pr. 292 = 7]
When the start signal is input to the inverter, the
inverter starts running. When the output frequency
reaches the value set in [Pr. 278] and the output
current is more than the value set in [Pr. 279] , the
inverter outputs the brake opening request signal
(BOF) after the time set in [Pr. 280] has elapsed.
When the time set in [Pr. 281] elapses after the brake
opening completion signal (BRI) was activated, the
inverter increases the output frequency to the set
speed.
When the speed has decreased to the frequency set
in [Pr. 282] during deceleration, the BOF signal is
turned OFF. When the time set in [Pr. 283] elapses
after the electromagnetic brake operation was
completed and the BRI signal was turned OFF, the
inverter output is switched OFF.
Output frequency(Hz)
Target frequency
[Pr.280]
[Pr.282]
[Pr.278]
[Pr.13]
STF
Output I
Brake opening request
(BOF signal)
Brake opening completion
(BRI signal)
Closed
Electromagnetic brake
operation
PARAMETER
[Pr.281]
[Pr.283]
ON
[Pr.279]
ON
ON
Opened Closed
Time