Digitax HD M753 Control User Guide
237
Issue Number: 3
Inductance
Inductance measurement out of range or motor saturation not detected
8
This trip occurs in RFC-S mode when the drive has detected that the motor inductances are not suitable for the operation
being attempted. The trip is either caused because the ratio or difference between Ld and Lq is too small or because the
saturation characteristic of the motor cannot be measured.
If the inductance ratio or difference is too small this is because one of the following conditions is true:
(
No-load Lq
(05.072)-
Ld
(05.024)) /
Ld
(05.024) < 0.1
(
No-load Lq
(05.072) -
Ld
(05.024)) < (K /
Full Scale Current Kc
(11.061))H
where:
If the saturation characteristic of the motor cannot be measured this is because when the flux in the motor is changed the
measured value of Ld does change sufficiently due to saturation to be measured. When half of
Rated Current
(05.007) is
applied in the d axis of the motor in each direction the inductance must fall change at least (K / (2 x
Full Scale Current Kc
(11.061)).
The specific reasons for each of the sub-trips are given in the table below:
Recommended actions for sub-trip 1:
•
Ensure that
RFC Low Speed Mode
(05.064) is set to Non-salient (1), Current (2) or Current No test (3).
Recommended actions for sub-trip 2:
•
Ensure that
RFC Low Speed Mode
(05.064) is set to Non-salient (1), Current (2) or Current No test (3).
Recommended actions for sub-trip 3:
•
None. The trip acts as a warning.
Recommended actions for sub-trip 4:
•
Stationary autotune is not possible. Perform a minimal movement or rotating autotune.
•
Phasing test on starting is not possible. Use a position feedback device with commutation signals or absolute position.
I/O Overload
Digital output overload
26
The
I/O Overload
trip indicates that the total current drawn from 24 V user supply or from the digital output has exceeded
the limit. A trip is initiated if one or more of the following conditions:
•
Maximum output current from one digital output is 100 mA.
•
The combined maximum output current from outputs 1 and 2 is 100 mA
•
The combined maximum output current from output 3 and +24 V output is 100 mA
Recommended actions:
•
Check total loads on digital outputs
•
Check control wiring is correct
•
Check output wiring is undamaged
Keypad Mode
Keypad has been removed when the drive is receiving the speed reference from the keypad
34
The
Keypad Mode
trip indicates that the drive is in keypad mode [
Reference Selector
(01.014) = 4 or 6 or M2 reference
selector (21.003 = 4 or 6 if motor map 2 is selected] and the keypad has been removed or disconnected from the drive.
Recommended actions:
•
Re-install keypad and reset
•
Change
Reference Selector
(01.014) to select the reference from another source
Trip
Diagnosis
Drive Rated voltage
(11.033)
K
200 V
0.0073
400 V
0.0146
575 V
0.0174
690 V
0.0209
Sub-trip Reason
1
The inductance ratio or difference is too small when the drive has been started in sensorless mode.
2
The saturation characteristic of the motor cannot be measured when the drive has been started in
sensorless mode.
3
The inductance ratio or difference is too small when an attempt is made to determine the location of the
motor flux during a stationary auto-tune in RFC-S mode. This trip is also produced when the inductance ratio
or inductance difference is too small when carrying out a phasing test on starting in RFC-S mode. If position
feedback is being used the measured value for
Position Feedback Phase Angle
(03.025) may not be
reliable. Also the measured values of
Ld
(05.024) and
No-load Lq
(05.072) may not correspond to the d and
q axis respectively.
4
The direction of the flux in the motor is detected by the change of inductance with different currents. This trip
is initiated if the change cannot be detected when an attempt is made to perform a stationary auto-tune
when position feedback is being used, or to perform a phasing test on starting in RFC-S mode.
Summary of Contents for Digitax HD M753 EtherCAT
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