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Mounting and Commissioning
3.3 Commissioning
Figure 3-21
Lift measurement brushes or interrupt measurement circuit. After a delay of approx. 5 s, the indication „Fail.
REF IEE<" is issued (not allocated on delivery). Reclose the measuring circuit.
If the indication „Fail. REF IEE<" is present even with closed measuring circuit, the rotor-earth capacity is
less than 0.15 µF. In this case, measuring circuit monitoring is not possible; the indication „Fail. REF IEE<"
should not be allocated to a binary output and deactivated (parameter 5106 IEE< = 0).
Finally check that all provisional measures for testing have been removed:
• Earthing bridge or resistor has been removed,
• Measurement circuits have been closed,
• Coupling unit connected to its AC supply voltage (see also connection example in Section 2.34).
An operational test with the running machine will be done later as described in Section "Checking the Rotor
Earth Fault Protection During Operation".
Rotor Earth Fault Protection (1 to 3 Hz)
The rotor earth fault protection can be checked with the machine at standstill. For this the series device 7XT71
must be fed an external AC voltage. This is 100 V to 125 V AC (see also connection example in Appendix A.3).
Switch rotor earth fault protection (address 6101 REF 1-3Hz) to Block relay.
The following operational measured values are read out and evaluated under fault-free conditions (see Table
3-28). The operational measured values are under earth fault measured values (in DIGSI see tab „Earth Fault
Measured Values").
408
Types of excitation
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
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