Filter
Top Products
219
Motor brake and stop operation
4
PARAMETERS
(4) 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).
REMARKS
⋅ Even if brake sequence mode has been selected, inputting the jog signal (jog operation), RT signal (second function selection)
or X9 signal (third function selection) during an inverter stop will switch to the normal operation and give priority to jog operation
or second and third function selection. Note that JOG and RT signal input is invalid even if JOG signal and RT signal are input
during automatic acceleration/deceleration operation.
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 Pr. 13 or a frequency equal to or higher than 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 or 8" is set in Pr. 292.
⋅ Setting Pr. 278 Brake opening frequency too high activates the stall prevention 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 Refer to page 92
Pr. 180 to Pr. 186 (input terminal function selection) Refer to page 231
Pr. 190 to Pr. 195 (output terminal function selection) Refer to page 239
Pr. 800 Control method selection Refer to page 92
Encoder feedback control Refer to page 381
ON
Time
Output
frequency
(Hz)
Less than 2s
Output frequency (Hz)
Pr. 278
Pr. 13
Brake opening request
(BOF signal)
Pr. 280