Mitsubishi Electric 800 Series Instruction Manual page 458

• If offline auto tuning has ended in error (see the table below), motor constants are not set. Perform an inverter reset and
restart tuning.
Error display
8 Forced end
9 Inverter protective function operation
91 The current limit (stall prevention) function is activated.
92 The converter output voltage fell to 75% of the rated value.
93 Calculation error
The motor is not connected.
94 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.)
• When tuning is ended forcibly by pressing
tuning does not end properly. (The motor constants have not been set.) Perform an inverter reset and restart tuning.
NOTE
• An instantaneous power failure occurring during tuning will result in a tuning error. After power is restored, the inverter goes
into the normal operation. Therefore, when STF (STR) signal is ON, the motor runs in the forward (reverse) rotation.
• Any alarm occurring during tuning is handled as in the normal operation. Note that even if a retry operation has been set,
retry is not performed.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
 Tuning the second applied motor (Pr.463)
• When performing operation where two motors are switched between one inverter, 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 will enable the parameter settings for the second motor as shown below.
Function
Motor constant (R1)
Auto tuning setting/status
Frequency search gain
NOTE
• The RT signal is assigned to the terminal RT in the initial status. Set "3" in any 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 relay
Pr.65, Pr.67 to Pr.69 retry function
page 351
Pr.71 Applied motor
Pr.79 Operation mode selection
Pr.156 Stall prevention operation selection
Pr.178 to Pr.189 (Input terminal function selection)
Error cause
or turning OFF the start signal (STF or STR) during tuning, offline auto
RT signal ON (second motor)
Pr.458
Pr.463
Pr.560
page 230
page 242
page 204
page 257
page 343
Countermeasures
Set "11" to 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.
RT signal OFF (first motor)
Pr.90
Pr.96
Pr.298
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
457
5. PARAMETERS