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4/4 BCN-C22005-646
(5) 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).
Additional notes for Instructions for UL and cUL
Motor overload protection
When using the electronic thermal relay function as motor overload protection, set the rated motor current in Pr.9
Electronic thermal O/L relay.
General precaution
CAUTION - Risk of Electric Shock -
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch power off, wait for
more than 10 minutes.
ATTENTION - Risque de choc électrique -
La durée de décharge du condensateur de bus est de 10 minutes. Avant de commencer le câblage ou
l’inspection, mettez l’appareil hors tension et attendez plus de 10 minutes.
SERIAL number check
Check the SERIAL number indicated on the inverter rating plate or package.
Refer to the inverter manual for the location of the rating plate.
Fault Display Description
E.MB1
(Detection frequency) - (output frequency) > Pr.285 during encoder feedback control
When Pr.285 Overspeed detection frequency = 9999, overspeed is not detected.
E.MB2
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)
E.MB3 Brake opening request signal (BOF) turned on though the motor is at a stop. (gravity drop prevention function)
E.MB4
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.
E.MB5
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.
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 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.
CAUTION
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 a frequency equal to or higher than the Pr.13 setting or 0.5Hz.
Overspeed detection (Pr.285) is valid under encoder feedback control (used with the FR-A7AP/FR-A7AL (option)) even
if a value other than "7, 8, 17 or 18" is set in Pr. 292.
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.
CAUTION
• Motor over temperature sensing is not provided by the drive.
Rating plate example
3 9
The SERIAL consists of one symbol, two characters indicating production year and month,
and six characters indicating control number.
The last digit of the production year is indicated as the Year, and the Month is indicated by
1 to 9, X (October), Y (November), or Z (December.)
Symbol Year Month Control number
SERIAL (Serial No.)
ON
Time
Output
frequency
(Hz)
Less than 2s
Output frequency (Hz)
Pr.278
Pr.13
Brake opening request
(BOF signal)
Pr.280
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