ABB REG316 4 Series Operating Instructions Manual page 418

ABB Switzerland Ltd
Procedure:
Test conditions: machine at rated speed with excitation and
·
on load, grounding test switch ES open.
Interrupt the REG 316*4 tripping circuits.
·
Set the voltage on the REG 316*4 as measured according to
·
Section 4.2.3.5.3.
Close the grounding switch ES.
·
Slowly reduce the voltage setting "U-Setting" in steps until the
·
protection trips.
Caution: The tripping signal is delayed.
Connect the test resistor R
·
tion circuit and repeat the above procedure.
Measure and record the voltage across terminals 1 and 2 of
·
YWX111-11/-21 during the test.
After the test has been completed, open the grounding switch
·
ES and close the REG 316*4 tripping circuits.
Checking the calibration of YWX111-11/-21
Measure the voltage across the bridge at terminals 1 and 2 of
YWX111-11/-21 with the machine running on load with excita-
tion. The reading should be £ 150 mV
(ES open). If it is higher,
check the contact resistance of the shaft grounding brush
·
(see Section 4.2.3.6.).
repeat the calibration of YWX111-11/-21 according to
·
4.2.3.5.2.
Note: It is possible that the 150 mV
the case of schemes with shaft filters and increased
YWX111-11/-21 sensitivity (R9 = 1 k W ).
4-20
REG 316*4 1MRB520049-Uen / Rev. B
to the minus pole of the excita-
P
in normal operation
r.m.s.
will not be reached in
r.m.s.
Section