Diagnostics Optimization CT MODBUS RTU Technical Data
234
E300 Design Guide
Issue Number: 1
Encoder trips
The following table shows trips that can be initiated that are related to the position feedback interface. The sub-trip number is 1 for the Drive position
feedback interface.
+ These trips can be enabled or disabled with
Drive Encoder Error Detection Level
(
C21
) bits 0 to 2
* These trips can be enabled or disabled with
Drive Encoder Error Detection Level
(
C21
) bit 3
1. If the terminations are not enabled on the A1, B1 or Z1 inputs the wire break system will not operate. (Note that as default the Z1 input
terminations are disabled to disable wire break detection on this input.)
2. Phase error detection for AB Servo, FD Servo, FR Servo or SC Servo encoders monitors the relationship between the position from the
incremental signals and the commutation signals to ensure that the incremental pulses have been counted correctly. The error is detected if the
incremental position moves outside the position range defined by the UVW commutation signals by 10°. The trip is initiated if the error is detected
for 10 consecutive samples. This system should not be used unless 10° electrical is less than one encoder line (AB Servo), or two lines (FD
Servo, FR Servo), or one sine wave (SC Servo) or else spurious Encoder 3 trips will occur.
3. Phase error detection for SINCOS encoders with comms monitors the relationship between the position derived from the sine waves with the
position derived via comms. The encoder is interrogated via comms and the comparison is made once per second. If the error is greater than 10°
electrical for 10 consecutive samples the trip is initiated. This system should not be used unless 10° electrical is less than one sine wave or else
spurious Encoder 3 trips will occur.
4. Incorrect encoder phasing is detected if the motor reaches half of the speed defined by VM_SPEED_FREQ_REF[MAX] and the phasing error is
large enough for the motor to accelerate uncontrollably.
Drive trip
Encoders
Reason for error
*Encoder 1
All
Power supply short circuit
*Encoder 2
AB, FD, FR, AB Servo,
FD Servo, FR Servo
+Hardware wire-break detect on A1, B1 and Z1 inputs
1
. There is no wire break detection on
the U1, V1 and W1 commutation inputs
SC, SC Servo, SC Hiperface,
SC EnDat, SC SSI, SC SC
+Software wire break detection on sine wave signals. There is no wire break detection on
the U1, V1 and W1 commutation inputs
*Encoder 3
AB Servo, FD Servo,
FR Servo, SC Servo
+Phase error
2
SC Hiperface, SC EnDat,
SC SSI
+Sine/cosine phase error
3
*Encoder 4
SC Hiperface, SC EnDat, EnDat,
BISS
Comms timeout
* Encoder 5
SC Hiperface, SC EnDat, EnDat,
BISS
Checksum/CRC error
SC SSI, SSI
Not ready at start of position transfer (i.e. data input not one)
* Encoder 6
SC Hiperface, SC EnDat, EnDat,
BiSS
The encoder has indicated an error
SSI, SC SSI
+Power supply alarm bit active
* Encoder 7
All
A set-up parameter for the device has been changed.
Encoder 8
EnDat, SSI, BiSS
Drive Encoder Type
(
C01
),
Drive Encoder Comms Bits
(
C08
),
Drive Encoder Comms Baud
Rate
(
C06
),
Drive Encoder Calculation Time
(
C24
),
Drive Encoder Recovery Time
(
C25
),
Drive Encoder Line Delay Time
(
C26
) are used to determine the time taken for the
communications exchange with the encoder. If this time exceeds 250
μ
s an Encoder
8 trip is
initiated.
Encoder 9
All
Speed feedback selected from an option slot that does not have a position feedback
category option module installed
Phasing Error
All
Incorrect encoder phasing
4
Encoder 12
SC Hiperface, BiSS
The encoder could not be identified during auto-configuration
Encoder 13
SC Hiperface, SC EnDat, EnDat,
BiSS
Data read from the position feedback device during auto-configuration is out of range
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