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HVAC Drive H300 303
Issue Number: 3
Out Phase Loss Output phase loss detected
98
The Out Phase Loss trip indicates that a phase loss has been detected at the drive output.
Note that if Reverse Output Phase Sequence (05.042) = 1 the physical output phases are reversed, and so sub-trip 3 refers
to physical output phase V and sub-trip 2 refers to physical output phase W.
Recommended action:
• Check motor and drive connections
• To disable the trip set Output Phase Loss Detection Enable (06.059) = 0
Over Speed Motor speed has exceeded the over speed threshold
7
In open loop mode, if the Output Frequency (05.001) exceeds the threshold set in Over Speed Threshold (03.008) in either
direction an Over Speed trip is produced. In RFC-A and RFC-S mode, if the Speed Feedback (03.002) exceeds the Over
Speed Threshold in Pr 03.008 in either direction an Over Speed trip is produced. If Pr 03.008 is set to 0.0 the threshold is
then equal to 1.2 x the value set in Pr 01.006.
In RFC-A and RFC-S modes if an SSI encoder is being used and P1 SSI Incremental Mode (03.047) is set to Off, an Over
Speed trip will be produced when the encoder passes through the boundary between its maximum position and zero.
The above description relates to a standard over speed trip, however in RFC-S mode it is possible to produce an
Overspeed trip with sub-trip 1. This is caused if the speed is allowed to exceed the safe level in RFC-S mode with flux
weakening. See Enable High Speed Mode (05.022) for details.
Recommended actions:
• Check the motor is not being driven by another part of the system
• Reduce the Speed Controller Proportional Gain (03.010) to reduce the speed overshoot (RFC-A, RFC-S modes only)
• If an SSI encoder is being used set Pr 03.047 to 1
The above description relates to a standard Over Speed trip, however in RFC-S mode it is possible to produce an Over
Speed.1 trip. This is caused if the speed is allowed to exceed the safe level in RFC-S mode with flux weakening when
Enable High Speed Mode (05.022) is set to -1.
Over Volts DC bus voltage has exceeded the peak level or maximum continuous level for 15 seconds
2
The Over Volts trip indicates that the DC bus voltage has exceeded the VM_DC_VOLTAGE[MAX] or
VM_DC_VOLTAGE_SET[MAX] for 15 s. The trip threshold varies depending on voltage rating of the drive as shown below.
Sub-trip Identification
Recommended actions:
• Increase deceleration ramp (Pr 00.004)
• Decrease the braking resistor value (staying above the minimum value)
• Check nominal AC supply level
• Check for supply disturbances which could cause the DC bus to rise
• Check motor insulation using an insulation tester
Trip Diagnosis
Sub-trip Reason
1 U phase detected as disconnected when drive enabled to run
2 V phase detected as disconnected when drive enabled to run
3 W phase detected as disconnected when drive enabled to run
4 Output phase loss detected when the drive is running
Voltage rating VM_DC_VOLTAGE[MAX] VM_DC_VOLTAGE_SET[MAX]
200 415 410
400 830 815
575 990 970
690 1190 1175
Source xx y zz
Control
system
00 0
01: Instantaneous trip when the DC bus voltage exceeds
VM_DC_VOLTAGE[MAX].
Control
system
00 0
02: Time delayed trip indicating that the DC bus voltage is above
VM_DC_VOLTAGE_SET[MAX].
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