Mitsubishi Electric FR-E700 Series Instruction Manual page 257

Parameter
Protective functions
If any of the following errors occurs in the brake sequence mode, the inverter results in a fault, trips,
and turns off the brake opening request signal (BOF).
Fault
Display
E.MB4
E.MB5
E.MB6
E.MB7
Tab. 6-26: Protective functions
NOTES During deceleration, inverter output is shut OFF when the frequency reaches Pr. 13 "Starting fre-
quency" or 0.5Hz, whichever is lower. For Pr. 278 "Brake opening frequency", set Pr. 13 or a fre-
quency equal to or higher than 0.5Hz.
A too large setting of Pr. 278 "Brake opening frequency" activates stall prevention operation and
may cause E.MB4.
If the sum of the time between Pr. 13 "Starting frequency" and Pr. 278 "Brake opening frequency"
+ Pr. 280 "Brake opening current detection time" is more than 2s, E.MB4 occurs.
FR-E700SC EC
Description
Although more than 2s have elapsed after the start command (forward or reverse rotation) is input, the
brake opening request signal (BOF) does not turn on.
Although more than 2s have elapsed after the brake opening request signal (BOF) turned on, the brake
opening completion signal (BRI) does not turn on.
Though the inverter had turned on the brake opening request signal (BOF), the brake opening completion
signal (BRI) turned off midway.
Although more than 2s have elapsed after the brake opening request signal (BOF) turned off at a stop, the
brake opening completion signal (BRI) does not turn off.
Brake opening request
(BOF signal)
Motor brake and stop operation
Output frequency [Hz]
Time
ON
6 - 113