Brake Sequence Function - Mitsubishi Electric 800 Series Instruction Manual

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
278
Brake opening frequency
A100
279
Brake opening current
A101
280 Brake opening current
A102 detection time
281 Brake operation time at
A103 start
282
Brake operation frequency
A104
283 Brake operation time at
A105 stop
284 Deceleration detection
A106 function selection
285 Overspeed detection
A107 frequency

292 Automatic acceleration/
F500 deceleration
639 Brake opening current
A108 selection
640 Brake operation frequency
A109 selection
641 Second brake sequence
A130 operation selection
Initial Setting
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 brake.
6 Hz 0 to 30 Hz
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.
0
The protective function activates when the deceleration
1
speed of the deceleration operation is not normal.
The brake sequence fault (E.MB1) activates when the
difference between the detection frequency and output
0 to 30 Hz
frequency is equal to or greater than the setting value under
9999
encoder feedback control.
9999 Overspeed detection disabled.
0 Normal operation
Operation with the shortest acceleration/deceleration time.
1, 11
(Refer to
Operation with the optimum acceleration/deceleration time.
3
0
(Refer to
5, 6 Lift operation 1, 2. (Refer to
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 speed
1
(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
9999 First brake sequence 1 is valid when the RT signal is ON
(A) Application parameters
V/F V/F V/F Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Vector Sensorless Vector Vector
Description
page 285.)
page 285.)
page 288.)
PARAMETERS
5
GROUP
A
457