# Brake Sequence Function (pr. 278 To Pr. 283, Pr. 292) - Mitsubishi Electric FR-E700 Instruction Manual

Frequency inverter.

Parameter
6.9.5

## 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.
Pr.
Name
No.
278
Brake opening frequency
279
Brake opening current
Brake opening current
280
detection time
Brake operation time at
281
start
282
Brake operation 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.
FR-E700 EC
Initial
Setting
Description
Value
Range
Set to the rated slip frequency of the
3Hz
0–30Hz
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
130%
0–200%
start.
Suppose that the rated inverter current
is 100%.
Generally, set this parameter to about
0.3s
0–2s
0.1 to 0.3s.
When Pr. 292 = 7, set the mechanical
delay time until the brake is loosened.
0.3s
0–5s
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).
6Hz
0–30Hz
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.
0.3s
0–5s
Sets the mechanical delay time until the
brake is closed + 0.2 to 0.3s when
Pr. 292 = 8.
0
Normal operation mode
Shortest acceleration/deceleration mode
1/11
(Refer to page 6-78.)
0
7
Brake sequence mode 1
8
Brake sequence mode 2
Motor brake and stop operation
GP MFVC
GP MFVC
GP MFVC
Parameters referred to
80
Motor capacity
81
Number of motor
poles
180–184
Input terminal
function selection
190–192
Output terminal
function selection
800
Control method
selection
Refer to
Section
6.2.1
6.2.1
6.10.1
6.10.5
6.3.2
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