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Universal Motor Controller
UMC100-FBP
V 6
Technical Description
Operation Details for Motors with Small Set Currents
Related parameters:
•
Current Factor
FieldBusPlug / Issue: 11.009
When using a UMC100-FBP in an environment with very strong magnetic ields and
a small set current at the same time, the current measurement can deviate a few
percent from the real current. Therefore the displayed motor current is too high and
an overload trip occurs too early.
Very strong magnetic ields can originate from a contactor directly mounted beside
the UMC100, closely passing current links or stray ields caused by large transform-
ers. When observing the effect, the distance between the UMC100 and the contac-
tor shall be increased to about 5 cm or the UMC100 shall be rotated by 90 degrees
or the motor wires shall be looped through the UMC100 two to ive times.
When looping the motor wires multiple times, the parameter Current Factor must be
adjusted according the number of loops. I.e. the parameter must be set to two if the
wires are looped through the UMC100 two times. Two to ive loops are supported.
The displayed current and the current transmitted over the ieldbus are automatically
corrected by the UMC100.
Please note that the adaptation of the current factor for √3 circuits and multiple
loops through the UMC100 are not possible at the same time.
Via ieldbus also higher values than ive e.g. six can be set. The UMC100 ignores
such values and creates a parameter fault. Values above 100 are possible and used
in combination with external current transformers (see previous page).
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UMC100-FBP
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