Brake Sequence Function - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.14.3

Brake sequence function

This function outputs operation timing signals of the mechanical brake from the inverter, such as for
lift applications.
This function is useful in preventing load slippage at a start due to poor mechanical brake timing and
overcurrent alarm in stop status and enable secure operation.
Pr.
278
A100
279
A101
280
A102
281
A103
282
A104
283
A105
284
A106
285
A107
292
F500
639
A108
640
A109
641
A130
FR-A800
Name
Brake opening frequency
Brake opening current
Brake opening current
detection time
Brake operation time at start
Brake operation frequency
Brake operation time at stop
Deceleration detection
function selection
Overspeed detection
frequency
Automatic acceleration/
deceleration
Brake opening current
selection
Brake operation frequency
selection
Second brake sequence
operation selection
Initial Setting
Description
value range
Set the rated slip frequency of the motor + approx.
1.0 Hz.
3 Hz 0 to 30 Hz
This can be set only when Pr. 278 ≤ Pr. 282.
If the setting is too low, dropping of the load is more
likely to occur at a start, and generally, it is set
between 50 and 90%.
130% 0 to 400%
The inverter rated current is regarded as 100%, or
the rated motor torque is regarded as 100%.
(According to Pr. 639 setting)
0.3 s 0 to 2 s Generally set between 0.1 and 0.3 s.
Set the mechanical delay time until braking eases.
0.3 s 0 to 5 s When Pr. 292 = "8" set the mechanical delay time
until braking eases + approx. 0.1 to 0.2 s.
Turn OFF the brake opening request signal (BOF) and
set the frequency for operating the electromagnetic
6 Hz 0 to 30 Hz brake. Generally, set the setting value of Pr. 278 + 3
to 4 Hz.
This can be set only when Pr. 282 ≥ Pr. 278.
When Pr. 292 = "7" set the mechanical delay time
until the brake closes + 0.1 s.
0.3 s 0 to 5 s
When Pr. 292 = "8" set the mechanical delay time
until the brake closes + approx. 0.2 to 0.3 s.
0 The deceleration detection function disabled.
The protective function activates when the
0
1 deceleration speed of the deceleration operation is
not normal.
The brake sequence fault (E.MB1) activates when the
difference between the detection frequency and
0 to 30 Hz
output frequency is equal to or greater than the
9999
setting value under encoder feedback control.
9999 Overspeed detection disabled.
0 Normal operation
Operation with the shortest acceleration/
1, 11
deceleration time.(Refer to page 5-263.)
Operation with the optimum acceleration/
3
0
deceleration time.(Refer to page 5-263.)
5, 6 Lift operation 1, 2. (Refer to page 5-268.)
7 Brake sequence mode 1
8 Brake sequence mode 2
0 Brake opening by output current
0
1 Brake opening by motor torque
0 Brake closing operation by frequency command
0
Brake closing operation by the actual motor rotation
1
speed (estimated value)
0 Normal operation when the RT signal is ON
7 Second brake sequence 1 when the RT signal is ON
0
8 Second brake sequence 2 when the RT signal is ON
First brake sequence 1 is valid when the RT signal is
9999
ON
(A) Application parameters
5 - 501