Mitsubishi Electric FR-A800 Series Instruction Manual page 642

Perform an inverter reset and perform tuning again.
Error display
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• When tuning is ended forcibly by pressing
tuning does not end properly. (The motor constants have not been set.)
Perform an inverter reset and perform tuning again.
• When the rated power supply of the motor is 200/220 V (400/440 V) 60 Hz, set the rated motor current multiplied by 1.1 in
Pr.9 Electronic thermal O/L relay after tuning is complete.
• For a motor with a PTC thermistor, thermal protector or other thermal detection, set "0" (motor overheat protection by
inverter invalid) in Pr.9 to protect the motor from overheating.
NOTE
• An instantaneous power failure occurring during tuning will result in a tuning error. After power is restored, the inverter starts
normal operation. Therefore, when the STF (STR) signal is ON, the motor starts forward (reverse) rotation.
• Any fault occurring during tuning is handled as in the normal operation. However, if the retry function is set, no retry is
performed.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
 Tuning the second motor (Pr.463)
• When one inverter switches the operation between two different motors, set the second motor in Pr.450 Second applied
motor, set Pr.463 Second motor auto tuning setting/status = "11", and perform tuning of the second motor.
• Turning ON the RT signal enables the parameter settings for the second motor as shown in the following table.
Motor constant (R1)
Frequency search gain
Auto tuning setting/status
NOTE
• The RT signal is assigned to terminal RT in the initial status. Set "3" in one of Pr.178 to Pr.189 (Input terminal function
selection) to assign the RT signal to another terminal.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
CAUTION
• Note that the motor may start running suddenly.
• For the offline auto tuning in vertical lift applications, etc., caution is required to avoid falling due to insufficient torque.
Parameters referred to
Pr.9 Electronic thermal O/L
Pr.65, Pr.67 to Pr.69 Retry
Pr.71 Applied motor, Pr.450 Second applied
Pr.79 Operation mode
Pr.156 Stall prevention operation
Pr.178 to Pr.189 (Input terminal function
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Error cause
Forced end
Inverter protective function operation
The current limit (stall prevention) function is activated.
The converter output voltage fell to 75% of the rated voltage.
Calculation error.
The motor is not connected.
Rotation tuning frequency setting error.
(The frequency command for the tuning was given to exceed
the maximum frequency setting, or to be in the frequency jump
range.)
Function
Pr.458
Pr.560
Pr.463
relaypage 415
functionpage 426
motorpage 528
selectionpage 389
selectionpage 431
selection)page 521
search engine
Set "11" in Pr.96 and retry.
Make the setting again.
Set the acceleration/deceleration time longer.
Set Pr.156 Stall prevention operation selection = "1".
Check for the power supply voltage fluctuation.
Check the motor wiring and make the setting again.
Check the Pr.1 Maximum frequency and Pr.31 to Pr.36
Frequency jump settings.
or turning OFF the start signal (STF or STR) during tuning, offline auto
RT signal ON (second motor)
Countermeasures
RT signal OFF (first motor)
Pr.90
Pr.298
Pr.96
5. PARAMETERS
5.14 (A) Application parameters
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