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Brake Sequence Function (pr. 278 To Pr. 285) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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Brake sequence function (Pr. 278 to Pr. 285)

Pr. 278 "brake opening frequency"
Pr. 279 "brake opening current"
Pr. 280 "brake opening current detection time"
Pr. 281 "brake operation time at start"
Pr. 282 "brake operation frequency"
Pr. 283 "brake operation time at stop"
Pr. 284 "deceleration detection function selection"
Pr. 285 "overspeed detection frequency"
This function is used to output from the inverter the mechanical brake opening completion signal timing signal
in vertical lift and other applications.
This function prevents the load from dropping with gravity at starting due to the operation timing fault of the
mechanical brake or an overcurrent alarm from occurring at a stop, ensuring secure operation.
The mechanical brake opening completion signal may either be entered or not entered into the inverter.
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This function is only valid when "7" or "8" is set in Pr. 60 to select brake sequence mode. (With the
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exception of Pr. 285)
Parameter
Factory Setting
Number
278
3Hz
279
130%
280
0.3 sec
281
0.3 sec
282
6Hz
283
0.3 sec
284
0
285
9999
<Wiring example>
·
Sink logic
·
Pr. 184 = 15
·
Pr. 190 = 20
NFB
Start signal
Multi-speed signal
Brake opening completion signal
(BRI signal)
Note: 1. The input signal terminal used depends on the Pr. 180 to Pr. 186 settings.
2. The output signal terminal used depends on the Pr. 190 to Pr. 195 settings.
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Setting Range
0 to 30Hz
0 to 200%
0 to 2 sec
0 to 5 sec
0 to 30Hz
0 to 5 sec
0, 1
0 to 30Hz, 9999
MC
Mechanical
brake
R 〈L
U
1
S 〈L
V
Motor
2
T 〈L
W
3
DC24V
STF
RH
*
(Note 2) RUN
MC
MC
AU (Note 1)
SD
SE
164
PARAMETERS
Related parameters
Pr. 60 "intelligent mode selection"
Pr. 80 "motor capacity"
Pr. 81 "number of motor poles"
Pr. 180 to Pr. 186 (input terminal
function selection)
Pr. 190 to Pr. 195
(output terminal function selection)
Brake opening request signal (BOF signal)
*Note the permissible current of the
inverter's internal transistor.
(24VDC 0.1A)

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