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UMC100-FBP
Universal Motor Controller
UMC100-FBP
Technical Description
FieldBusPlug / Issue: 03.2012
Earth Fault Protection
The earth fault protection function protects the motor and the network against ground curr
ent flow. Earth
faults are mainly caused due to ageing of the insulation, deterioration of insulation due to sustained or
cyclic overloading, moisture or conductive dust.
The monitoring of the earth fault is carried out with the help of the auxiliary device CEM11 or based on an
UMC100 internal calculation of the ground fault current.
Detection of ground faults can be used to interrupt the motor to prevent further damage, or to alert the
maintenance personnel to perform timely maintenance.
Protection based on external CT CEM11
The CEM11 device monitors if the sum of the three phase currents is zero. It using a current transformer
where all 3 phases are feed through. The signalling output of the CEM11 can be connected to one of the
multifunction inputs of the UMC. The earth fault signal can be optionally delayed. It is also possible to
suppress the earth fault during the motor start-up phase.
•
CEM11 can be used in all types of networks (grounded or undgrounded)
•
Can be used also in networks with higher impedance to ground. Also small ground
fault currents can be detected
Block Diagram:
Earth Fault
Trip / Warning
CEM11 Signal
Ton
&
Suppress
during
start up
Signal flow of the earth fault protection function
Sample Circuit Diagram:
To use CEM11 with the UMC proceed as follows:
1. Select the CEM11 model that suits your application needs. There are four different models available with
feed-through holes from 35mm to 120mm.
2. Connect the CEM11 to one of the multifunction inputs DO0, DI1 or DI2 and 24V DC supply.
3. Configure the corresponding multifuncion input as earth fault input. You can select if the earth fault super-
vision shall be suppressed during motor start or not.
4. Optionally a time can be configured to delay the creation of a fault or warning. It is adjustable from 0.1 to
25.5 s.
5. Configure the threshold when an earth fault should be signalled. The threshold can be set directly at the
earth fault monitor (CEM11) itself. See the CEM11 technical manual for further details.
UMC100
3
24 V DC
10 11
13 14 15 16 17 18
DI0 DI1 DI2 DI3 DI4 DI5
0 V
M
3
Relevant Parameters CEM11:
•
Multifunction Delay Time
•
Multifunction Inputs 0,1, or 2
Содержание UMC100-FBP
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