Mitsubishi Electric FR-A800 Series Instruction Manual page 576

• When the inverter decelerates to the frequency set to Pr.282 Brake operation frequency during deceleration, the inverter
turns OFF the brake opening request signal (BOF) and decelerates further to the frequency set in Pr.278. After
electromagnetic brake operation completes and the inverter recognizes the turn OFF of the BRI signal, the inverter holds
the frequency set in Pr.278 for the time set in Pr.283 Brake operation time at stop. And after the time set in Pr.283
passes, the inverter decelerates again. The inverter outputs is shut off when the frequency reaches Pr.13 Starting
frequency setting or 0.5 Hz, whichever is lower.
 Operation without Brake opening completion (Pr.292 = "8") signal input
• When the start signal is input to the inverter, the inverter starts running, and when the output frequency reaches the
frequency set in Pr.278 Brake opening frequency and the output current or the motor torque is equal to or greater than
the Pr.279 Brake opening current setting, the brake opening request signal (BOF) is output after the time set in Pr.280
Brake opening current detection time.
After the BOF signal is output, the output frequency is increased to the set speed after the set time in Pr.281 Brake
operation time at start.
• When the inverter decelerates to the frequency set to Pr.282 Brake operation frequency during deceleration, the inverter
turns OFF the brake opening request signal (BOF) and decelerates further to the frequency set in Pr.278. And after the
time set in Brake operation time at stop passes, the inverter decelerates again. Pr.13 Starting frequency setting or 0.5
Hz, whichever is lower
NOTE
• Even if the brake sequence operation has been selected, inputting the JOG signal (JOG operation) changes the operation
method to normal operation and give a priority to the JOG operation. Note that the JOG signal input by the brake sequence
function is invalid during operation.
 Set multiple brake sequence functions (Pr.641)
• When the second brake sequence function is set, it is possible to switch between and use two types of brake sequence
functions. Turning ON the Second function selection (RT) signal enables the Second brake sequence function.
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Output frequency(Hz)
Target frequency
Pr.282
Pr.278
Pr.13
STF
Output current or motor torque
(select by Pr.639)
Brake opening request
(BOF signal)
Brake opening completion
(BRI signal)
Electromagnetic brake
operation
Output frequency(Hz)
Target frequency
Pr.282
Pr.278
Pr.13
STF
Output current or motor torque
(select by Pr.639)
Brake opening request
(BOF signal)
Electromagnetic brake
operation
search engine
Pr.280
Pr.281
ON
Pr.279
ON
ON
Closed Opened
Pr.280
Pr.281
ON
Pr.279
ON
Closed Opened
Pr.13 setting
or 0.5Hz,
whichever is lower
Time
Pr.283
Closed
Pr.13 setting
or 0.5Hz,
whichever is lower
Time
Pr.283
Closed
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
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