Mitsubishi Electric 800 Series Instruction Manual page 41

NOTE
• If the offline auto tuning is started before the encoder position tuning for a PM motor is finished (Pr.1105 (Pr.887) =
"65535"), the protective function (E.MP) is activated.
 Encoder position tuning
Encoder position tuning is required when a PM motor with an encoder is driven. The measured offset value between
the motor home magnetic pole position and the encoder home position is stored. Only encoder position tuning can
be performed when offline auto tuning is not required, such as when the parameters for motor constant are set
manually, or when offline auto tuning is already performed.
Pr.
373 871
Encoder position tuning setting/status
C142 C243
 
1105 887
Encoder magnetic pole position offset
C143 C244
 
*1 The setting can be changed only when the FR-A8AL is installed.
*2 The setting can be changed only when the FR-A8TP is installed.
Before performing encoder position tuning
• Check that an option for vector control for PM motor, a motor, and an encoder are properly connected.
• Check that a motor (single, stop status) is connected. (Check that the motor is not rotated by an external force during tuning.)
• Check that the mechanical brake is released.
• Check that the vector control (speed control) for the PM motor with an encoder is selected (refer to
NOTE
• Encoder position tuning is required when a PM motor is used. (It is disabled when an induction motor is used.)
• When auto tuning is performed while Pr.96 = "101", offline auto tuning and encoder position tuning can be
performed at the same time (refer to
Setting
• To perform tuning, set Pr.373 (Pr.871) = "1".
Performing tuning
• Before tuning, check the monitor display of the PU if the inverter is in the state ready for tuning. If the start command
is turned ON though the inverter is not ready, the motor can start running.
• In the PU operation mode, press
In the external operation mode, turn ON the start command (STF signal or STR signal). Tuning will start.
NOTE
• The motor shaft rotates up to 2 times during tuning.
Vector Vector Vector
Initial
Name
value
0
65535
page 3).
/ on the operation panel.
Setting
range
0 Encoder position tuning disabled.
1 Encoder position tuning enabled.
0 to 16383 Encoder position tuning data set.
65535 No encoder position tuning data.
4
Description
page 3).
BCN-C22005-910