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UMC100-FBP
Universal Motor Controller
UMC100-FBP
Technical Description
FieldBusPlug / Issue: 03.2012
Protection based on internal Calculation
The UMC can detect an earth fault by summing up the three phase currents
without
using an external
current transformer.
The internal earth fault detection function signals a warning when the earth fault current exceeds a set
thr
eshold for a configurable period of time, after the motor start-up. The earth fault detection function cre-
ates a trip when the current continuously exceeds a separately set threshold for a set period of time, after
the motor start-up.
•
Ground fault current must be > 20% of I
e
to be detected
•
Only usable in networks with low impedance to ground. Only higher ground fault cur-
rents can be detected
•
The set trip and warn levels should not be above 80% of I
e
Block Diagram:
Earth Fault Trip
Vectorsum
> Trip Thresh.
I
L1
I
L2
I
L3
Ton
Vectorsum
> Warn Thresh.
Ton
Earth Fault Warning
&
&
>
Always
After
start-up
Signal flow of the internal earth fault protection function
Relevant Parameters Internal Ground Fault:
•
Earth Flt Trip Level
•
Earth Flt Warn Level
•
Earth Flt Trip Delay
•
Earth Flt Warn Delay
•
Earth Flt Detection
Summary of Contents for UMC100-FBP
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