Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual page 180

(3) Protective functions
If any of the following errors occur in the brake sequence mode, the inverter results in an alarm, shuts off the
output and switches off the brake opening request signal (BOF terminal).
On the operation panel (FR-DU04) LED and parameter unit (FR-PU04) screen, the following errors are
displayed:
Error
Display
(Detected frequency) - (output frequency) > Pr. 286 in the PLG feedback control mode. (Overspeed detection function)
E.MB1
Deceleration is not normal during deceleration operation (Use Pr. 284 to select this function.) (Except stall prevention
E.MB2
operation)
E.MB3 Brake opening request signal (BOF) switched on though the motor is at a stop. (Gravity drop prevention function)
More than 2 seconds after the run command (forward or reverse rotation) is input, the brake opening request signal
E.MB4
(BOF) does not switch on.
More than 2 seconds after the brake opening request signal switched on, the brake opening completion signal (BRI)
E.MB5
does not switch on.
Though the inverter had switched on the brake opening request signal (BOF), the brake opening completion signal (BRI)
E.MB6
switched off during that period.
More than 2 seconds after the brake opening request signal (BOF) switched off at a stop, the brake opening completion
E.MB7
signal (BRI) does not switch off.
Note: During PLG feedback control (when the FR-A5AP option is loaded), overspeed detection (Pr. 285) is
valid if the Pr. 60 setting is other than "7 or 8".
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Error Display
167
PARAMETERS