Mitsubishi Electric FR-A700 Technical Manual page 365

2.20.3 Brake sequence function [Pr. 278 to 283, 284*, 285*, 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
[Pr.] Name
278 Brake opening frequency
279 Brake opening current
Brake opening current
280
detection time
Brake operation time at a
281
start
282 Brake operation frequency
283 Brake operation time at stop
Deceleration detection
284
function selection
Overspeed detection
285
*
frequency
Automatic acceleration/
292
deceleration
* When performing vector control with the FR-A7AP or FR-A7AL, this parameter changes to speed deviation excess detection
frequency. (For details, refer to page 294.)
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.
Initial
Setting Range
Value
Set to the rated slip frequency of the motor +
about 1.0Hz.
3Hz 0 to 30Hz
Setting is enabled only when [Pr. 278]
282].
Generally, set this parameter to about 50 to
90%. If the setting is too low, the load is
0 to 220%
A700
130% liable to drop due to gravity at start.
0 to 200% Suppose that the rated inverter current is
E700
100%.
Generally, set this parameter to about 0.1 to
0.3s 0 to 2s
0.3s.
Set the mechanical delay time until the
brake is loosened when [Pr. 292=7].
0.3s 0 to 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). Generally, set this
6Hz 0 to 30Hz
parameter to the [Pr. 278] setting + 3 to 4Hz.
Setting is enabled only when [Pr. 282]
278].
Set the mechanical delay time until the
brake is closed + 0.1s when [Pr. 292 = 7].
0.3s 0 to 5s Set the mechanical delay time until the
brake is closed + 0.2 to 0.3s when [Pr. 292 =
8].
0 Deceleration is not detected.
If deceleration is not normal during
0
1 deceleration operation, the inverter alarm is
provided.
If (detected frequency) - (output frequency)
≥
0 to 30Hz
Pr. 285 during encoder feedback control,
9999
the inverter fault (E.MBI) is provided.
9999 Overspeed is not detected.
0 Normal operation mode
Shortest acceleration/deceleration mode
1, 11
(refer to page 242)
Optimum acceleration/deceleration mode
3
0
(refer to page 243)
5, 6 Elevator mode (refer to page 249)
7 Brake sequence mode 1
8 Brake sequence mode 2
399
A700 E700
(A700)
(*[Pr. 284, 285] are not available for
Description
≤
[Pr.
≥
[Pr.
PARAMETER
.)
E700
Available Inverters
A700 E700
2
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