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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 179

Transistorized inverter, high function & low acoustic noise.
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<Setting>
( 1 ) Parameter setting
1) Select advanced magnetic flux vector control. (Pr. 80, Pr. 81 •"9999")
2) Set "7 or 8" (brake sequence mode) in Pr. 60.
To ensure more complete sequence control, it is recommended to set "7" (brake opening completion signal
input) in Pr. 60. Note that the automatic restart after instantaneous power failure function is not activated
when the brake sequence mode is selected.
3) Refer to the following table and set the parameters:
Parameter
Name
Number
Brake opening
278
frequency
279
Brake opening current
Brake opening current
280
detection time
Brake operation time
281
at start
Brake closing
282
frequency
Brake operation time
283
at stop
Deceleration
284
detection function
selection
Overspeed detection
285
frequency
Note: When using this function, set the acceleration time to 1 second or longer.
( 2 ) Explanations of terminals used
The terminals must be allocated using Pr. 180 to Pr. 186 and Pr. 190 to Pr. 195.
Signal
Terminals Used
BOF
According to Pr. 180 to Pr. 186
BRI
According to Pr. 190 to Pr. 195
Note: 1. The brake opening completion signal (BRI) is a parameter valid when Pr. 60 = 7.
2. When the terminal functions are changed using Pr. 180 to 186 and Pr. 190 to Pr. 195, the other
functions may be affected. Confirm the functions of the corresponding terminals before making
settings.
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Setting
Set to the rated slip frequency of the motor + about 1.0Hz.
0 to 30Hz
This parameter may only be set if Pr. 278 ≤ Pr. 282.
Generally, set this parameter to about 50 to 90%. If the setting is too
0 to 200%
low, the load is liable to drop with gravity at start.
Suppose that the rated inverter current is 100%.
0 to 2 sec
Generally, set this parameter to about 0.1 to 0.3 seconds.
Pr. 60 = 7: Set the mechanical delay time until the brake is loosened.
0 to 5 sec
Pr. 60 = 8: Set the mechanical delay time until the brake is loosened +
about 0.1-0.2 seconds.
At this frequency, the brake opening request signal (BOF) is switched
0 to 30Hz
off. Generally, set this parameter to the Pr. 278 setting + 3-4Hz.
This parameter may only be set if Pr. 282 ≥ Pr. 278.
Pr. 60 = 7: Set the mechanical delay time until the brake is closed + 0.1
seconds.
0 to 5 sec
Pr. 60 = 8: Set the mechanical delay time until the brake is closed +
about 0.2 to 0.3 seconds.
0
Deceleration is not detected.
If deceleration is not normal during deceleration operation, the
1
inverter alarm (E.MB2) is provided to shut off the output and switch off
the brake opening request signal (BOF).
If (detected frequency) - (output frequency) > Pr. 285 in the PLG
0 to 30Hz
feedback control mode, the inverter alarm (E.MB1) is provided to shut off
the output and switch off the brake opening request signal (BOF).
9999
Overspeed is not detected.
Brake Sequence Mode
Pr. 60 = 7 (with mechanical brake
opening completion signal)
Brake opening request
Brake opening completion signal
166
PARAMETERS
Description
Pr. 60 = 8 (without mechanical
brake opening completion signal)
Brake opening request


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