Snubber Over-Current Detected; Option Module Does Not Acknowledge During Drive Mode Changeover; Output Phase Loss Detected; Motor Speed Has Exceeded The Over Speed Threshold - Emerson Unidrive M702 User Manual

Safety Product Mechanical
information information installation
Trip
OI Snubber

Snubber over-current detected

The OI Snubber trip indicates that 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.
Source
Power
system
92
Recommended actions:
• Ensure the internal EMC Filter is installed
• Ensure the motor cable length does not exceed the maximum for selected switching frequency
• Check for supply voltage imbalance
• Check for supply disturbance such as notching from a DC drive
• Check the motor and motor cable insulation with an insulation tester
• Fit an output line reactor or sinusoidal filter
Option Disable

Option module does not acknowledge during drive mode changeover

The Option Disable trip indicates that the option module did not acknowledge notifying the drive that communications with
the drive has been stopped during the drive mode changeover with in the allocated time.
215 Recommended trip:
• Reset the trip
• If the trip persists replace the option module
Out Phase Loss

Output phase loss detected

The Out Phase Loss trip indicates that a phase loss has been detected at the drive output. If Output Phase Loss Detection
Enable (06.059) = 1 then output phase loss is detected as follows:
1. When the drive is enabled short pulses are applied to make sure each output phase is connected.
2. During running the output current is monitored and the output phase loss condition is detected if the current contains
98
more than TBD % negative phase sequence current for TBDs.
Recommended action:
• Check motor and drive connections
• To disable the trip set Output Phase Loss Detection Enable (06.059) = 0
Over Frequency Output frequency has exceeded the maximum frequency threshold
222 The Over Frequency trip indicates that the output frequency has exceeded 560 Hz for more than 4 ms.
Over Speed

Motor speed has exceeded the over speed threshold

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 mode, if an SSI encoder is being used and Pr 03.047 is set to 0 an Over Speed trip will be produced
7
when the encoder passes through the boundary between its maximum position and zero.
Recommended actions:
• 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
264
Electrical Getting Basic
installation started parameters the motor
xx y
Power
Rectifier
module
number
number
Running NV Media Card
Optimization
Operation
Diagnosis
zz
00 Rectifier snubber over-current trip detected.
Onboard Advanced Technical
Diagnostics
PLC parameters data
Description
Unidrive M702 User Guide
UL listing
information
Issue Number: 3