Stop-On-Contact Control - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
NOTES During PM sensorless vector control, the brake sequence function is available with the IPM motor
MM-CF only.
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 a frequency equal
to or higher than the Pr. 13 setting or 0.5 Hz.
Pr. 285 "Overspeed detection frequency" is valid under encoder feedback control (used with the
FR-A8AP (option)) even if a value other than "7 or 8" is set in Pr. 292 "Automatic acceleration/decel-
eration".
Setting Pr. 278 too high activates the stall prevention and may cause E.MB4.
E.MB4 occurs when the acceleration time from Pr. 13 to Pr. 278 + Pr. 280 reaches or exceeds 2 s.
Brake opening request
Parameters referred to
Pr. 3
Pr. 180 to Pr. 186
Pr. 190 to Pr. 195
5.14.4

Stop-on-contact control

To ensure accurate positioning at the upper limit, etc. of a lift, stop-on-contact control causes the me-
chanical brake to close while the motor creates a holding torque to keep the load in contact with a me-
chanical stopper, etc.
This function suppresses vibration that is likely to occur when the load is stopped upon contact in lift
applications, thereby ensuring reliable and highly accurate positioning stop.
Fig. 5-232:
FR-A800
Less than 2 s
Pr. 278
Pr. 13
Pr. 280
(BOF signal)
Base frequency
(input terminal function selection)
(output terminal function selection)
Magnetic flux Sensorless Magnetic flux Magnetic flux
Without stop-on-contact control
Vibration
Suppressing vibration in vertical motion applications
Output
frequency
(Hz)
Time
ON
Sensorless Sensorless
With stop-on-contact control
Complete stop
Lift
(A) Application parameters
=> page 5-654
=> page 5-422
=> page 5-361
Lift
I001567E
5 - 489