Error Handling Of The Umc; Umc100.3 Fault Indication; Fault Messages; Automatic Reset Of Protection Faults - ABB UMC100.3 Manual

E R R O R H A N D L I N G , M A I N T E N A N C E A N D S E R V I C E
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9 Error handling, maintenance and service
Within this chapter you will find the following information

• Error handling of the UMC

• Detailed explanation of all error and diagnosis messages
• Functions related to maintenance and service
Error handling of the UMC
When the UMC detects a fault condition the fault becomes latched. Once a fault becomes latched, it remains latched - even if the
underlying fault condition is eliminated - until acknowledged by a fault reset command.

Automatic Reset of Protection Faults

The setting of the "Fault autoreset" parameter determines how the UMC manages protection trips.
• Off (the default setting): A protection trip must be acknowledged by the user. This can be done via LCD panel, fieldbus or the mul-
tifunction inputs DI0-DI2 if configured.
• On: A protection trip is automatically acknowledged without intervention of either a human operator or the remote PLC if the trip
condition has gone (e.g. cooling time over).
Fault History
The PBDTM/UMC100.3 operator panel provides access to the fault history. The last 16 faults and their arrival time in seconds since
power on are displayed. If the UMC is switched off the fault history is cleared.

UMC100.3 fault indication

The UMC offers the following possibilities for indicating a fault.
• Fault indication via digital outputs: The outputs DO2 and DO3 can be used to signal a summary fault. DO2 is a relay output that
uses the same supply as DO0 and DO1. DO3 is a 24VDC output and can be used to drive a signal lamp as an example. The fault
outputs can be configured with the parameter Fault Outputs.
• Fault indication via LEDs on the UMC: The red fault LED is switched on in the event of a fault and remains on until the fault is ac-
knowledged.
• Fault messages on the LCD panel: See the table below.
• Signalling via fieldbus: In the event of a fault the "Fault Bit" in the cyclic communication telegram is set to logical-1. Furthermore a
diagnosis telegram (if supported by the used fieldbus) is generated that describes the fault details.

Fault messages

The following table lists all diagnosis and fault messages and potential root causes for the fault. It gives you a first indication of
where to look for a fault and how to fix it.
Indicator
Thermal overload trip
Phase loss
Phase imbalance
Code Source / Root Cause
0 Load side
1 Supply side
Load side
Contactors
2 Supply side
Load side
Contactors
Possible Cause / Suggested Action
Trip because of thermal overload of the motor.
Check process conditions
Check if the cooling time is too short
Check I and trip class settings
e
Check current factor if configured
Panel indicates the trip current in %
At least one phase current is below the phase loss threshold
Check for blown fuse
Check for loose contacts
Check contact wear
The current in one phase is below the adjusted threshold.
Check supply side
Check for loose contacts
Check contact wear
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