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7UM62 Manual
C53000-G1176-C149-3
X COUPLING = yyy Ω (address 6006)
correspond with the above values. Remove earth fault bridge.
An earth fault is now fitted as described above via a resistor of the warning resistance,
(RE< WARN, address 6002, 10 kΩ when delivered from factory.
The earth resistance calculated by the unit can be read out under the Operational
Measured Values as Rotor. If substantial deviation occurs between the actual rotor
earth resistance and the indicated resistance, the accuracy can be improved by
correction of the c.t. angle error PHI I RE (address 6009). This c.t. angle error
correction is only effective for the rotor earth fault protection function.
An earth fault is now fitted as described above via a resistor of approximately 90% of
the trip resistance (RE<< TRIP, address 6003, 2 kΩ when delivered). The rotor earth
fault protection initiates a pick-up signal and after 6005 T-TRIP-RE<< (0.5 s when
delivered from factory) a trip annunciation (LED 1 and binary output 2) in both cases
this is a group indication "Device Trip").
In the case of machines with excitation via slip rings, the above test is repeated for the
other slip ring.
Remove earth fault resistor.
Excitation
machine
Coupling
unit
Excitation via rotating rectifiers
with measurement brushes
Figure 3-19
Types of Excitation
Lift measurement brushes or interrupt measurement circuit. Alarm "Failure R/E/F"
is indicated after a time delay of approx. 5 s (not allocated on delivery). Close
measurement circuit.
If the alarm "Failure R/E/F" is also present with the measurement circuit closed,
then the rotor-earth capacitance is less than 0.15 µF. In this case, a measurement
circuit supervision is not possible; the alarm "Failure R/E/F" then should not be
marshalled to any binary output. Set parameter 5106 IEE< = 0.
3.3 Commissioning
Excitation
equipment
Coupling
unit
Excitation equipment fed via slip
rings
353
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