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Diagnostics Optimization CT MODBUS RTU Technical Data
228 E300 Design Guide
Issue Number: 1
Drive Encoder Position Feedback Signals (C11) shows the state of the signals from the position feedback device as given in the table below where
the signals are relevant for the type of device. Drive Encoder Position Feedback Signals (C11) is only intended as a debugging aid.
For Cos and Sin signals the relevant bits of Drive Encoder Position Feedback Signals (C11) will be set when the signals are positive and cleared
when the signals are negative.
If Drive Encoder Feedback Reverse (C12) = 1 the position feedback is negated. This can be used to reverse the direction of the position feedback.
The phase angle between the rotor flux and the feedback position must be set up correctly for the drive to control the motor correctly. If the phase
angle is known it can be set in Position Feedback Phase Angle (C13) by the user. Alternatively the drive can automatically measure the phase angle
by performing a phasing test (see Motor Autotune (B11)). When the test is complete the new value is automatically written to Position Feedback
Phase Angle (C13). Position Feedback Phase Angle (C13) can be modified at any time and becomes effective immediately. Position Feedback
Phase Angle (C13) has a factory default value of 0.0, but is not affected when defaults are loaded by the user.
The alignment required for zero position feedback phase angle (i.e. Position Feedback Phase Angle (C13) = 0.0) is given below for different feedback
devices. Forward rotation of the motor is produced when Vu leads Vv leads Vw. Although it is not essential, forward rotation of a motor is normally
defined as clockwise when looking at the motor shaft end. When the motor is rotating forwards the motor speed is shown as positive and the position
increases.
AB Servo, FD Servo, FR Servo
The alignment required between the no-load motor voltages and the commutation signals for Position Feedback Phase Angle (C13) = 0.0 is shown in
the diagram below. It should be noted that if the encoder is advanced (i.e. the UVW signals are moved to the right with respect to the voltages) the
angle in Position Feedback Phase Angle (C13) is increased from zero. If the encoder is retarded the angle changes to 359.9 and then reduces
towards zero.
C11 Drive Encoder Position Feedback Signals
Mode RFC-A, RFC-S
Minimum
0
(Display: 000000)
Maximum
63
(Display: 111111)
Default Units
Type 16 Bit Volatile Update Rate Background write
Display Format Binary Decimal Places 0
Coding RO, ND, NC, PT
Drive Encoder Position Feedback
Signals (C11) bits
Signals
0 A or F or Cos
1 B or D or R or Sin
2Z
3U
4V
5W
C12 Drive Encoder Feedback Reverse
Mode RFC-A, RFC-S
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
C13 Position Feedback Phase Angle
Mode RFC-S
Minimum 0.0 Maximum 359.9
Default Units °
Type 16 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 1
Coding RW, ND
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