Hitachi SJ300 Series - Manual (Page 23)

Chapter 2 – Explanation of Functions
2.10 Encoder Phase Configuration
Using this setting, if the encoder is connected with A and B phase reversed, the signal from the encoder
can be reversed without actually changing the encoder wiring. This configuration doesn’t affect the Z
phase.
For proper operation, the inverter expects the encoder signal to be as follows when motor rotates in the
forward direction:
P010 = 00: ‘A’ phase first (Standard encoder, recommended)
A phase (EAP)
B phase (EBP)
P010 = 01: ‘B’ phase first
A phase (EAP)
B phase (EAP)
Depending on the configuration of the particular encoder installed, the signal phases may be reversed.
Instead of rewiring the inverter, simply set parameter P010 as shown below.
Function
Code
Function Name Setting Range Remarks
P010
Encoder phase configuration －
00: OFF (A phase first)
01: ON (B Phase first)
2.11 Auto-tuning with Elevator Cable Connected to Motor Shaft
With this function, motor constants can be measured without disconnecting the cable from the motor,
and inverter parameters can be auto-tuned. Motor constants R1, R2 and L are automatically
measured. During auto-tuning, the inverter outputs DC voltage to excite the motor. This DC excitation
does not rotate the motor. Nevertheless, the brake should be always engaged during this process.
Then, you will manually adjust parameters of I
0
(no load current) and J (inertia). To obtain correct
values for I
0
, refer to motor specifications or test report. Otherwise, typical values can be used. You
can also measure the appropriate value following the procedure which is described in Chapter 4.
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