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Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 467
Issue Number: 1
OI Snubber
Snubber over-current detected
92
OI Snubber trip indicates an over-current condition has been detected in the rectifier snubber circuit. The reason for the trip
can be identified by the sub-trip number.
Recommended actions:
• Check for AC power supply voltage imbalance
• Check for AC power supply disturbance such as notching from a DC drive
• Check the motor and motor cable with an insulation tester
• Check the motor cable length does not exceed the maximum for the selected switching frequency
• Fit the internal EMC filter where not already installed
• Fit an output line reactor or sinusoidal filter where long motor cables are used
Option Disable Option module does not acknowledge during drive mode changeover
215
During drive mode changeover, option modules must acknowledge that they have stopped accessing the communications
system between the option slots and the drive. If an option module does not do this in the allowed time then this trip is
produced.
Recommended actions:
• Reset the trip.
• If the trip persists, replace the option module.
Out Phase Loss Output phase loss detected
98
Out Phase Loss trip indicates that phase loss has been detected at the drive output.
If Reverse Motor Phase Sequence (B26)= 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 actions:
• Check motor power connections at drive, output motor contactors and motor
• Check integrity of motor and motor cables using an insulation tester
• Disable the trip in Output Phase Loss Detection Enable (H06) = 0
Over Speed Motor speed has exceeded the over speed threshold
7
In open loop mode, if Output Frequency (J60) exceeds the threshold set in Motor Over Speed Threshold (E09) in either
direction an Over speed trip is produced. In RFC-A and RFC-S mode, if the speed feedback Drive Encoder Speed
Feedback (J51) exceeds Motor Over Speed Threshold (E09) in either direction an Over speed trip is produced. If Motor
Over Speed Threshold (E09) is set to 0.0 the threshold is then equal to 1.2 x the value set in Motor Maximum Speed Clamp
(E08)
Recommended actions:
• Adjust the speed loop proportional gain to reduce overshoot (RFC-A, RFC-S)
The above description relates to a standard Over speed trip, however in RFC-S mode it is possible to produce an Over
Speedy 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 (B28) is set.
Trip Diagnosis
Source xx y zz Description
Power
system
01
Rectifier
number
00 Rectifier snubber over-current trip detected.
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.
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