Mitsubishi Electric FR-A820-00046 Instruction Manual page 708

(A) Application parameters
NOTES During PM sensorless vector control, the brake sequence function is available with the IPM motor
MM-CF only.
During deceleration, inverter output is shut OFF when the frequency reaches Pr. 13 "Starting fre-
quency" or 0.5 Hz, whichever is lower. For Pr. 278 "Brake opening frequency", set a frequency equal
to or higher than the Pr. 13 setting or 0.5 Hz.
Pr. 285 "Overspeed detection frequency" is valid under encoder feedback control (used with the
FR-A8AP (option)) even if a value other than "7 or 8" is set in Pr. 292 "Automatic acceleration/decel-
eration".
Setting Pr. 278 too high activates the stall prevention and may cause E.MB4.
E.MB4 occurs when the acceleration time from Pr. 13 to Pr. 278 + Pr. 280 reaches or exceeds 2 s.
Brake opening request
Parameters referred to
Pr. 3
Pr. 180 to Pr. 186
Pr. 190 to Pr. 195
5 - 506
Less than 2 s
Pr. 278
Pr. 13
Pr. 280
(BOF signal)
Base frequency
(input terminal function selection)
(output terminal function selection)
Output
frequency
(Hz)
Time
ON
Parameters
=> page 5-690
=> page 5-439
=> page 5-378