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Universal Motor Controller
UMC100-FBP
Technical Description
Phase Loss Protection
This function protects motors against the extreme situation where a complete phase is lost. An unde-
tected phase loss can cause motor damage because of the sudden rise of current in the two remaining
phases. Thus the thermal overload protection performs an accelerated trip during phase loss.
The following table shows the tripping times in case of phase loss for the different trip classes.
Trip class
Tripping time [s]
Relevant Parameters:
•
Phase Loss Protection
Phase Imbalance Protection
Imbalance protection function protects the motor against a small degree of imbalance in the motor
phases.
Function:
The current phase imbalance function signals a warning when the current in a phase differs more than the
conigured warning level from the average current in all 3 phases. A ix hysteresis is built in.
The current phase imbalance protection signals a fault when the current in a phase differs more than the
conigured trip level from the average current in all 3 phases for a period of time. This time is trip class
dependant and shown in the table above.
Block Diagram:
Relevant Parameters:
•
Phase Imbalance Warning Level
•
Phase Imbalance Trip Level
UMC100-FBP
The phase loss protection function must not be disabled in real applications. The
phase loss protection may only be disabled for demo purposes.
5
1.5
I
123
Imbalance
Detection
After Start-up
>1
During Start-up
10
0
3
6
Imb >
Warning Level
Imb >
Trip Level
- 40 -
30
40
9
1
Imbalance
&
Warning
Imbalance
&
Trip
FieldBusPlug / Issue: 11.009
V 6
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