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Information
200
Unidrive User Guide
www.controltechniques.com Issue Number: 9
L1.SYNC
Synchronisation to the AC supply failed
39
Regeneration sinusoidal rectifier failed to synchronise to the AC supply.
Ensure that the AC supply voltage and frequency are within the specified limits.
Ensure power connections are correct.
OA
Control PCB over temperature
23
The ambient temperature around the control PCB has reached the over temperature threshold of 95
°
C (203
°
F) (see the
Air
alarm).
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Check ambient temperature
Reduce drive switching frequency
Oh1
IGBT junction over temperature (based on the drive thermal model)
21
IGBT junction temperature (based on the drive’s thermal model) has reached the over temperature threshold of 145
°
C (293
°
F) and
the drive was unable to reduce the switching frequency further.
Pr 7.32
displays the estimated IGBT junction temperature calculated
by the drive.
Reduce drive switching frequency
Reduce duty cycle
Decrease acceleration / deceleration rates
Reduce motor load
Oh2
Heatsink over temperature
22
Heatsink temperature (detected by thermistor) has reached the over temperature threshold of 94
°
C (201
°
F) (see the
hot
alarm).
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
OI.AC
Over Current in output stage
3
Over current threshold on the output of the drive, of 225% of the drive’s Full Load Current (FLC), has been reached. (The FLC of the
drive is displayed in Pr
11.32
)
This can be caused by the following:
•
Pr
0.03
Acceleration rate
set too low
•
Pr
0.04
Deceleration rate
set too low
•
Short-circuit at the output of the drive
•
Break-down of motor insulation (check with Megger)
•
Incorrect motor map values see section 7.2
on page 84 for details on how to enter the motor map
•
Excessive motor-cable length (increased cable capacitance charging current)
•
CL> Loss of speed feedback signals
•
CL> Noise on speed feedback signals
•
CL> Loose mechanical coupling on speed feedback device
•
CL>
Reduce the values in the speed loop gain parameters (Pr
3.10
, Pr
3.11
and Pr
3.12
)
•
CL>
Reduce the values in the current loop gain parameters (Pr
4.13
and Pr
4.14
)
•
SV> Phase offset value incorrect (Encoder Pr
3.28
, SINCOS encoder and Resolver Pr
16.09
). Perform a phase offset test, see
on page 86 for more information.
•
OL & VT> If this trip occurs during an autotune (sometimes with large motors), decrease the voltage boost value in Pr
5.15
.
OI.AC n
Over current in the output stage of module n
118 to 125
Over current threshold in the output of the stage of module
n
of 170% of the drive’s Full Load Current (FLC), has been reached (size
5 only).
This can be caused by the following:
•
Pr
0.03
Acceleration rate
set too low
•
Pr
0.04
Deceleration rate
set too low
•
Short-circuit at the output of the drive
•
Break-down of motor insulation (check with Megger)
•
Incorrect motor map values see section 7.2
on page 84 for details on how to enter the motor map
•
Excessive motor-cable length (increased cable capacitance charging current)
•
CL> Loss of speed feedback signals
•
CL> Noise on speed feedback signals
•
CL> Loose mechanical coupling on speed feedback device
•
CL>
Reduce the values in the speed loop gain parameters (Pr
3.10
, Pr
3.11
and Pr
3.12
)
•
CL>
Reduce the values in the current loop gain parameters (Pr
4.13
and Pr
4.14
)
•
SV> Phase offset value incorrect (Encoder Pr
3.28
, SINCOS encoder and Resolver Pr
16.09
). Perform a phase offset test, see
on page 86 for more information.
•
OL & VT> If this trip occurs during an autotune (sometimes with large motors), decrease the voltage boost value in Pr
5.15
.
Trip
Diagnosis
Summary of Contents for Unidrive 1 Series
Page 208: ......
