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Brake Sequence Function (pr. 278 To Pr. 285) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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4.2.63 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 at a stop, ensuring secure operation.
The mechanical brake opening completion signal may either be entered or not entered into the inverter.
This function is only valid when "7" or "8" is set in Pr. 60 to select advanced magnetic flux vector control in
the external operation mode. (With the exception of Pr. 285)
Parameter
Factory
Number
Setting
278
3Hz
279
130%
280
0.3 s
281
0.3 s
282
6Hz
283
0.3 s
284
0
285
9999
(Note) When the brake sequence function is selected, automatic restart after instantaneous power failure
function is invalid.
<Wiring example>
• Sink logic
• Pr. 184 = 15
• Pr. 190 = 20
Power supply
Start signal
Multi-speed signal
Brake opening completion 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.
Setting Range
0 to 30Hz
0 to 200%
0 to 2 s
0 to 5 s
0 to 30Hz
0 to 5 s
0, 1
0 to 30Hz, 9999
MC
NFB
R 〈 L
U
1
S 〈 L
V
2
T 〈 L
W
3
STF
RH
(Note 2) RUN
MC
AU (Note 1)
(BRI signal)
SD
SE
177
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)
Mechanical
brake
Motor
24VDC
*
Brake opening request signal (BOF signal)
MC
*Note the permissible current of the
inverter's internal transistor.
(24VDC 0.1A)
PARAMETERS
4

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    good manual and it is very good to understand the contant of inverter and i lernt many things in this manual