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HVAC Drive H300 297
Issue Number: 3
HF20 Data processing error: ASIC is not compatible with the hardware
The HF20 trip indicates that the ASIC version is not compatible with the drive firmware. The ASIC version can be identified
from the sub-trip number.
Recommended actions:
• Hardware fault - Contact the supplier of the drive
HF23 to HF25 Hardware fault
Recommended actions:
• Hardware fault - Contact the supplier of the drive
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
Inductance This trip occurs in RFC-S mode when the drive has detected that the motor inductances are not suitable.
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))) H.
The specific reasons for each of the sub-trips and recommended actions 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.
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.
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