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Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual Page 138

Fr-e700 series.
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Motor brake and stop operation
(4)
Protective functions
If any of the following occurs during the brake sequence operation, the inverter results in a fault, trips, and turns OFF the
brake opening request signal (BOF).
Fault Display
Although more than 2s have elapsed after the start command (forward or reverse rotation) is input, the brake opening
E.MB4
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
E.MB5
completion signal (BRI) does not turn ON.
Although the inverter had turned ON the brake opening request signal (BOF), the brake opening completion signal (BRI)
E.MB6
turned OFF midway.
Although more than 2s have elapsed after the brake opening request signal (BOF) turned OFF at a stop, the brake
E.MB7
opening completion signal (BRI) does not turn OFF.
NOTE
During deceleration, inverter output is shut OFF when the frequency reaches Pr.13 Starting frequency or 0.5Hz,
whichever is lower. For Pr.278 Brake opening frequency, set Pr.13 or a frequency equal to or higher than 0.5Hz.
Setting Pr. 278 Brake opening frequency too high 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.
Parameters referred to
Pr. 80 Motor capacity, Pr. 81 Number of motor poles
Pr. 180 to Pr. 184 (input terminal function selection)
Pr. 190 to Pr. 192 (output terminal function selection)
Pr. 800 Control method selection
138
Description
Refer to page 84
Refer to page 139
Refer to page 145
Refer to page 84
Pr. 278
Pr. 13
Brake opening request
(BOF signal)
Less than 2s
Output
frequency
(Hz)
Pr. 280
Time
ON

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