28 S&C Instruction Sheet 768-550
Voltage Sensor
▲
Output Terminals
on Switch Control
Output Terminals
on Burden Assembly
Jaw-Side Pole 1
23 and 26
VS01 and N1
Jaw-Side Pole 2
24 and 26
VS02 and N1
Jaw-Side Pole 3
25 and 26
VS03 and N1
Hinge-Side Pole 1
27 and 30
VS04 and N2
Hinge-Side Pole 2
28 and 30
VS05 and N2
Hinge-Side Pole 3
29 and 30
VS06 and N2
▲
Switch poles are identified as follows: When facing the mechanism side of
the switch, Pole 1 is on the left, Pole 2 is in the center, and Pole 3 is on the
right . For the tiered-outboard configuration, Pole 1 is on the top, Pole 2 is in
the center, and Pole 3 is on the bottom .
Calibration
Table 3. Voltage Sensor Wiring
Current-sensor magnitude ratios written on this card
can be used directly to calibrate the current-sensing inputs
to the RTU.
Refer to the manufacturer’s instructions for calibrating
the voltage-sensing and current-sensing inputs to the RTU.
Voltage-sensor and current-sensor phase-angle shifts are not
generally required for calibrating transducer-equipped RTUs.
Measure the voltage-sensor output selector switch is in the
69 Vac
position after calibrating the RTU.
For future reference, keep the yellow card in the water-
resistant envelope and place it in the instruction manual
holder inside the control unit enclosure.
S&C Data Sheet 768-93 (furnished) provides additional
information on the sensors included with S&C Automated
Switches. Refer to this publication for details regarding
specifications and accuracies of the outputs.
Alternate Location of Data
If the yellow card is not available, the magnitude-ratio and
phase-angle shift measurements of the voltage-sensor portion
of each S&C Current/Voltage Sensor are also stamped on the
left side of the sensor’s terminal pad. These measurements
are expressed in the form “V XXXX/XX.X,” where the value
to the left of the “/” is the magnitude ratio and the value to
the right is the phase-angle shift.
The magnitude-ratio and phase-angle shift measurements
of each S&C Current Sensor and the current-sensor portion
of each S&C Current/Voltage Sensor are also stamped on the
right side of the sensor’s terminal pad. These measure ments
are expressed in the form “I XXX.X/X.X,” where the value to
the left of the “/” is the magnitude ratio and the value to the
right is the phase-angle shift.
