Mitsubishi Electric FR-A500 Instruction Manual page 189

(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
E.MB1 (Detected frequency) - (output frequency) > Pr. 285 in the encoder feedback control mode. (Overspeed detection function)
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. (A drop due to gravity prevention function)
More than 2s after the run command (forward or reverse rotation) is input, the brake opening request signal (BOF) does
E.MB4
not switch on.
More than 2s after the brake opening request signal switched on, the brake opening completion signal (BRI) does not
E.MB5
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 2s after the brake opening request signal (BOF) switched off at a stop, the brake opening completion signal
E.MB7
(BRI) does not switch off.
Note: During encoder feedback control (when the FR-A5AP option is fitted), overspeed detection (Pr. 285)
is valid if the Pr. 60 setting is other than "7 or 8".
Error Display
180
PARAMETERS