Mitsubishi Electric FR-A500 Instruction Manual page 188

<Setting>
(1) Parameter setting
1) Select advanced magnetic flux vector control. (Pr. 80, Pr. 81
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 detection
284
function selection
Overspeed detection
285
frequency*
* When vector control is executed with the FR-A5AP, this is replaced with excessive speed deviation
detection frequency. (Refer to the instruction manual of the FR-A5AP for details.)
Note: When using this function, set the acceleration time to 1s 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. 190 to Pr. 195
BRI According to Pr. 180 to Pr. 186
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.
Setting
Set to the rated slip frequency of the motor + about 1.0Hz.This parameter
0 to 30Hz
may only be set if Pr. 278 ≤ Pr. 282.
Generally, set this parameter to about 50 to 90%. If the setting is too low,
0 to 200% the load is liable to drop with gravity at start.
Suppose that the rated inverter current is 100%.
0 to 2 s Generally, set this parameter to about 0.1 to 0.3s.
Pr. 60 = 7: Set the mechanical delay time until the brake is loosened.
0 to 5 s Pr. 60 = 8: Set the mechanical delay time until the brake is loosened +
about 0.1-0.2s.
At this frequency, the brake opening request signal (BOF) is switched off.
0 to 30Hz Generally, set this parameter to the Pr. 278 setting + 3-4Hz.
This parameter may only be set if Pr. 282
Pr. 60 = 7: Set the mechanical delay time until the brake is closed + 0.1s.
0 to 5 s Pr. 60 = 8: Set the mechanical delay time until the brake is closed + about
0.2 to 0.3 s.
0 Deceleration is not detected.
If deceleration is not normal during deceleration operation, the inverter
1 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 encoder
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.
Pr. 60 = 7 (with mechanical brake
opening completion signal)
Brake opening request
Brake opening completion signal
179
PARAMETERS
≠
"9999")
Description
Pr. 278.
Brake Sequence Mode
Pr. 60 = 8 (without mechanical brake
opening completion signal)
Brake opening request

4