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Brake Sequence Function (pr. 278 To Pr. 283, Pr. 292) - Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual

Fr-e700 series.
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4.10.5 Brake sequence function (Pr. 278 to Pr. 283, Pr. 292)

This function is used to output from the inverter the mechanical brake operation timing signal in vertical lift and other
applications.
This function prevents the load from dropping with gravity at a start due to the operation timing error of the mechanical
brake or an overcurrent alarm from occurring at a stop, ensuring secure operation.
Parameter
Name
Number
Brake opening
278
frequency
279
Brake opening current
Brake opening current
280
detection time
Brake operation time at
281
start
Brake operation
282
frequency
Brake operation time at
283
stop
Automatic acceleration/
292
deceleration
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 188)
<Connection diagram>
Sink logic
Pr. 184 = 15
Pr. 190 = 20
MCCB
Power supply
Start signal
Multi-speed signal
Brake opening
completion signal (BRI)
NOTE
When brake sequence function is selected, automatic restart after instantaneous power failure is invalid.
When using this function, set the acceleration time to 1s or longer.
Changing the terminal function using any of Pr. 178 to Pr. 184 and Pr. 190 to Pr. 192 may affect the other functions.
Set parameters after confirming the function of each terminal.
Initial
Setting
Value
Range
3Hz
0 to 30Hz
130%
0 to 200%
0.3s
0 to 2s
0.3s
0 to 5s
6Hz
0 to 30Hz
0.3s
0 to 5s
0
1, 11
0
7
8
MC
Mechanical
brake
R/L1
U
S/L2
V
Motor
T/L3
W
24VDC
STF
RH
*3
*2
MC
Brake opening
RUN (BOF)
request signal
RL(BRI)
*1
(BOF)
SD
SE
Motor brake and stop operation
AD MFVC
AD MFVC
AD MFVC
GP MFVC
GP MFVC
GP MFVC
Description
Set to the rated slip frequency of the motor + about 1.0Hz.
This parameter may be set only if Pr. 278 ≤ Pr. 282.
Generally, set this parameter to about 50 to 90%. If the setting
is too low, the load is liable to drop due to gravity at start.
Suppose that the rated inverter current is 100%.
Generally, set this parameter to about 0.1 to 0.3s.
When Pr. 292 = "7", set the mechanical delay time until the
brake is loosened.
Set the mechanical delay time until the brake is loosened +
about 0.1 to 0.2s when Pr. 292 = "8".
Set the frequency to activate the mechanical brake by turning
OFF the brake opening request signal (BOF). Generally, set
this parameter to the Pr. 278 setting + 3 to 4Hz.
This parameter may be set only if Pr. 278 ≤ Pr. 282.
Set the mechanical delay time until the brake is closed + 0.1s
when Pr. 292 = 7.
Sets the mechanical delay time until the brake is closed + 0.2
to 0.3s when Pr. 292 = 8.
Normal operation mode
Shortest acceleration/deceleration mode (Refer to page 114)
Brake sequence mode 1
Brake sequence mode 2
∗1
The input signal terminal used differs according to the
Pr. 178 to Pr. 184 settings.
∗2
The output signal terminal used differs according to the
Pr. 190 to Pr. 192 settings.
∗3
The current should be within the permissible current of
transistor in the inverter. (24V 0.1ADC)
4
135

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