Mitsubishi Electric FR-A800, Instruction Manual

Page: 664 / 1042

(A) Application parameters Parameters
5 - 484
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. Name
Initial
value
Setting
range
Description
278
A100
Brake opening frequency 3 Hz 0 to 30 Hz
Set the rated slip frequency of the motor + approx.
1.0 Hz.
This can be set only when Pr. 278
≤
Pr. 282.
279
A101
Brake opening current 130% 0 to 400%
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%.
The inverter rated current is regarded as 100%, or
the rated motor torque is regarded as 100%.
(According to Pr. 639 setting)
280
A102
Brake opening current
detection time
0.3 s 0 to 2 s Generally set between 0.1 and 0.3 s.
281
A103
Brake operation time at start 0.3 s 0 to 5 s
Set the mechanical delay time until braking eases.
When Pr. 292 = "8" set the mechanical delay time
until braking eases + approx. 0.1 to 0.2 s.
282
A104
Brake operation frequency 6 Hz 0 to 30 Hz
Turn OFF the brake opening request signal (BOF) and
set the frequency for operating the electromagnetic
brake. Generally, set the setting value of Pr. 278 + 3
to 4 Hz.
This can be set only when Pr. 282
≥
Pr. 278.
283
A105
Brake operation time at stop 0.3 s 0 to 5 s
When Pr. 292 = "7" set the mechanical delay time
until the brake 0.1 s.
When Pr. 292 = "8" set the mechanical delay time
until the brake approx. 0.2 to 0.3 s.
284
A106
Deceleration detection
function selection
0
0 The deceleration detection function disabled.
1
The protective function activates when the
deceleration speed of the deceleration operation is
not normal.
285
A107
Overspeed detection
frequency
9999
0 to 30 Hz
The brake sequence fault (E.MB1) activates when the
difference between the detection frequency and
output frequency is equal to or greater than the
setting value under encoder feedback control.
9999 Overspeed detection disabled.
292
F500
Automatic acceleration/
deceleration
0
0 Normal operation
1, 11
Operation with the shortest acceleration/
deceleration time.(Refer to page 5-255.)
3
Operation with the optimum acceleration/
deceleration time.(Refer to page 5-255.)
5, 6 Lift operation 1, 2. (Refer to page 5-260.)
7 Brake sequence mode 1
8 Brake sequence mode 2
639
A108
Brake opening current
selection
0
0 Brake opening by output current
1 Brake opening by motor torque
640
A109
Brake operation frequency
selection
0
0 Brake closing operation by frequency command
1
Brake closing operation by the actual motor rotation
speed (estimated value)
641
A130
Second brake sequence
operation selection
0
0 Normal operation when the RT signal is ON
7 Second brake sequence 1 when the RT signal is ON
8 Second brake sequence 2 when the RT signal is ON
9999
First brake sequence 1 is valid when the RT signal is
ON
Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector PM PM PM