Calibration Of The Ancillary Unit Type Ywx111-11/-21 - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. B
4.2.3.5.2.

Calibration of the ancillary unit Type YWX111-11/-21

The measuring bridge of which the YWX111-11/-21 is part must
be balanced with the unit connected by appropriately selecting
the values of the capacitors C
Fig. 4.5
Calibration capacitor C
Calibration can be carried out while the machine is stationary.
Procedure:
Interrupt the REG 316*4 tripping circuits.
·
Connect an AC voltmeter to terminals 1 and 2 of
·
YWX111-11/-21.
Connect a decade capacitor in place of C
·
Close the excitation switch.
·
Switch on the auxiliary supply U
·
Vary C
·
YWX111-11/-21 becomes a minimum; typically £ 50 mV
Note: It is possible that the 50 mV
Calibration of the YWX111-11/-21
: Polyester, ³ 400 V
X
until the output voltage across terminals 1 and 2 of
X
the case of schemes with shaft filters and increased
YWX111-11/-21 sensitivity (R9 = 1 k W ).
ABB Switzerland Ltd
.
X
.
X
.
SH
will not be reached in
r.m.s.
.
r.m.s.
4-17