Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 269 / 608

Parameter Motor brake and stop operation
FR-E700 SC EC/ENE 6 - 115
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
Description
E.MB4
Although more than 2 s have elapsed after the start command (forward or reverse rotation) is input, the
brake opening request signal (BOF) does not turn on.
E.MB5
Although more than 2 s have elapsed after the brake opening request signal (BOF) turned on, the brake
opening completion signal (BRI) does not turn on.
E.MB6
Though the inverter had turned on the brake opening request signal (BOF), the brake opening completion
signal (BRI) turned off midway.
E.MB7
Although more than 2 s have elapsed after the brake opening request signal (BOF) turned off at a stop, the
brake opening completion signal (BRI) does not turn off.
Tab. 6-26: Protective functions
NOTES 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 Pr. 13 or a fre-
quency equal to or higher than 0.5 Hz.
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 2 s, E.MB4 occurs.
Output frequency [Hz]
Brake opening request
(BOF signal)
Time
ON
Output fr
equenc
y [H
z]