Mitsubishi Electric FR-A700 Instruction Manual page 445

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.MB1
E.MB2
E.MB3
E.MB4
E.MB5
E.MB6
E.MB7
Tab. 6-71: Protective functions
NOTES
Overspeed detection (Pr. 285) is valid under encoder feedback control (used with the FR-
A7AP option) even if a value other than "7 or 8" is set in Pr. 292.
A too large setting of Pr. 278 "Brake opening frequency" activates stall prevention operation
and may cause E.MB4.
FR-A700 EC
Description
(Detection frequency) - (output frequency) > Pr. 285 during encoder feedback control When Pr. 285
Overspeed detection frequency = 9999, overspeed is not detected.
Deceleration is not normal during deceleration operation from the set frequency to the frequency set
in Pr. 282. (when Pr. 284 =1) (except stall prevention operation).
Brake opening request signal (BOF) turned on though the motor is at a stop. (gravity drop prevention
function).
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 com-
pletion 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.
Motor brake and stop operation
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