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Powerdrive F300 User Guide 269
Issue Number: 2
Low Load The load on the drive has fallen below the low load detection level
38
When the low load detector is active, the low load condition is detected when the Percentage Load (Pr 04.020) falls below
the threshold defined by the Low Load Detection Level (Pr 04.027).
Enable Trip On Low Load (Pr 04.029) defines the action taken when low load is detected. If Enable Trip On Low Load
(Pr 04.029) = 0, a Low Load warning is displayed and Low Load Detected Alarm (Pr 10.062) = 1. If Enable Trip On Low
Load (Pr 04.029) = 1 no warning is given, but a Low Load trip is initiated.
Recommended actions:
• Check the load on the motor has not changed
Motor Too Hot
Output current overload timed out (I
2
t)
20
The Motor Too Hot trip indicates a motor thermal overload based on the output current (Pr 05.007) and motor thermal time
constant (Pr 04.015). Pr 04.019 displays the motor temperature as a percentage of the maximum value. The drive will trip
on Motor Too Hot when Pr 04.019 gets to 100 %.
Recommended actions:
• Ensure the load is not jammed / sticking
• Check the load on the motor has not changed
• Tune the rated speed parameter (RFC-A mode only)
• Check feedback signal for noise
• Ensure the motor rated current is not zero
OHt Control Control stage over temperature
23
This OHt Control trip indicates that a control stage over-temperature has been detected. From the sub-trip ‘xxyzz’, the
Thermistor location is identified by ‘zz’.
Recommended actions:
• Check enclosure / drive fans are still functioning correctly
• Check enclosure ventilation paths
• Check enclosure door filters
• Increase ventilation
• Reduce the drive switching frequency
• Check ambient temperature
OHt dc bus DC bus over temperature
27
The OHt dc bus trip indicates a DC bus component over temperature based on a software thermal model. The drive
includes a thermal protection system to protect the DC bus components within the drive. This includes the effects of the
output current and DC bus ripple. The estimated temperature is displayed as a percentage of the trip level in Pr 07.035. If
this parameter reaches 100 % then an OHt dc bus trip is initiated. The drive will attempt to stop the motor before tripping. If
the motor does not stop in 10 seconds the drive trips immediately.
Recommended actions:
• Check the AC supply voltage balance and levels
• Check DC bus ripple level
• Reduce duty cycle
• Reduce motor load
• Check the output current stability. If unstable;
Check the motor map settings with motor nameplate (Pr 05.006, Pr 05.007, Pr 05.008, Pr 05.009, Pr 05.010,
Pr 05.011) – (All Modes)
Disable slip compensation (Pr 05.027 = 0) – (Open loop)
Disable dynamic V to F operation (Pr 05.013 = 0) - (Open loop)
Select fixed boost (Pr 05.014 = Fixed) – (Open loop)
Select high stability space vector modulation (Pr 05.020 = 1) – (Open loop)
Disconnect the load and complete a rotating autotune (Pr 05.012) – (RFC-A, RFC-S)
Auto-tune the rated speed value (Pr 05.016 = 1) – (RFC-A, RFC-S)
Reduce speed loop gains (Pr 03.010, Pr 03.011, Pr 03.012) – (RFC-A, RFC-S)
Add a speed feedback filter value (Pr 03.042) – (RFC-A, RFC-S)
Add a current demand filter (Pr 04.012) – (RFC-A, RFC-S)
Trip Diagnosis
Source xx y zz Description
Control system 00 0 01 Control board thermistor 1 over temperature
Control system 00 0 02 Control board thermistor 2 over temperature
Control system 00 0 03 I/O board thermistor over temperature
Source xx y zz Description
Control system 00 2 00 DC bus thermal model gives trip with sub-trip 0
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