12 S&C Instruction Sheet 1023-550
Software Troubleshooting
Incorrect Real-Time
Data
Use the correct screenset.
To close the open screenset, in the
File
menu select the
Close
Screenset
option. Then in the
File
menu, select the
Open Screenset
option and choose
the correct screenset for the capacitor control. When the screenset opens (the
Operation
screen is displayed), in the
Connection
menu, select the
Connect to Device
option.
Software in control is XXXX... IntelliLink is not properly configured for this
product
Reinstall the IntelliLink software on the computer. There may be a problem with one of the
files. See the “To Install the IntelliLink Software” section in Instruction Sheet 1023-530,
“IntelliCap® Plus Automatic Capacitor Control:
Setup
,” for more information.
Sensed current is zero on the Operation screen
Check that the sensor cable is securely connected to the sensors and to the capacitor control.
Check that the cable is not damaged. See Instruction Sheet 1023-510, “S&C IntelliCap® Plus
Automatic Capacitor Control:
Installation
,” for more information.
Following utility-approved work procedures and safety practices, verify that current is
flowing through the sensor and that the sensor is installed properly.
Line Voltage display does not match measured ac voltage
IntelliCap Plus controls calculate True RMS voltage from frequent samples. Digital
voltmeters calculate RMS voltage for a pure sine wave. Voltage harmonics encountered in
power distribution alter the pure sine wave. RMS voltmeters do not account for this, so their
readings are often inaccurate.
True RMS is a repeatable voltage result, independent of waveform harmonic content.
Therefore, voltage override setpoint values can be accurately determined using voltages
displayed and data logged by the IntelliCap Plus control. The Fluke Model 189 True RMS
meter (or equivalent) is the reference voltmeter used to confirm voltage indications on an
IntelliCap Plus control.
Real-time kvar values are wrong
Follow these steps to correct kvar values:
STEP 1.
Check the
Voltage Transformer Wiring
and
Voltage Transformer Ratio
setpoints on the
Setup>Site-Related
screen. The
Voltage Transformer Wiring
setpoint should reflect how the transformer powering the capacitor control is
wired (phase to ground or phase to phase). The
Voltage Transformer Ratio
setpoint should be the ratio of the transformer’s primary rated voltage to 120 volts.
For example, a 12000/120-240 volt transformer has a ratio of 12000/120, or 100:1.
STEP 2.
Check the current level. Because of sensor accuracy limitations at low current
levels, phase angle detection and display require a minimum current of 0.5% of full
scale values. Below this threshold, the measured power factor reads “1.000” and
the kvar values read “0.” Current magnitudes continue to be detected and displayed
below the 0.5% threshold.
For example: For a capacitor control with a 600-amp Lindsey sensor, phase
angle detection shuts down at approximately 3 amps. Below 3 amps, the power
factor displayed is 1.000 and the kvars displayed is 0.
STEP 3.
Check the
Installation Phase Offset
setpoint on the
Setup>Site- Related
screen.
