S&C Instruction Sheet 1023-550 13
Miscellaneous Problems
SCADA commands are ignored by the capacitor control
Follow these steps to check SCADA command performance:
STEP 1.
Check the SCADA CONTROL LED display. To operate the bank remotely, the
faceplate REMOTE LED display must be lit. If it is not, press the SCADA CONTROL
CHANGE button.
STEP 2.
Check for control power. See the “LCD Display Problems” section on page 9.
STEP 3.
Check the RTU address. On Page 1 of the
Communications Setup
screen, check
which communications RTU address is used by this control. Make sure the SCADA
master station is sending commands for this control to the correct address.
STEP 4.
Check the baud rate. On Page 2 of the
Communications Setup
screen, make sure
the baud rate is correct for your communications equipment. For modems, the
baud rate should match the baud rate used by the SCADA master station.
STEP 5.
Check your communications hardware. See the appropriate communication
instructions for more information.
Capacitor bank switch does not operate
Follow these steps to check bank switch operation:
STEP 1.
Make sure the faceplate LOCAL and MANUAL LED displays are both lit. If the
LOCAL LED display is off, press the SCADA CONTROL CHANGE button. If the
MANUAL LED display is off, press the OPERATION MODE CHANGE button, then
press the CLOSE or OPEN button.
STEP 2.
Check the faceplate CLOSE/OPEN LED displays. If the OPEN LED display is
blinking slowly, the Reclose Block delay is operating. Wait until it stops blinking,
then try switching the bank again. If both LED displays are off, see the “Incompatible
Ident” section on page 11.
STEP 3.
Check the line voltage level. Make sure the line voltage is not below the minimum
required to switch the capacitor bank.
STEP 4.
Check the Capacitor Bank Switch Control Pulse Time. Connect the computer to
the control and start the IntelliLink software. Check that the
Capacitor Bank
Switch Control Pulse Time
setpoint (on Page 2 of the
Setup>General
screen) is
long enough. See Instruction Sheet 1023-530, “S&C IntelliCap® Plus Automatic
Capacitor Control:
Setup
,” for more information.
STEP 5.
Check the wiring. The wiring between the capacitor control and a bank switch may
be damaged or defective.
STEP 6.
Check the capacitor bank primary switch(es). The capacitor bank switch(es) may
be malfunctioning.
Some (but not all) capacitor bank switches do not operate
STEP 1.
Check the line-voltage level. Make sure the line voltage is not below the minimum
required to switch the capacitor bank.
STEP 2.
Check the Capacitor Bank Switch Control Pulse Time. Connect the computer to
the capacitor control and start the IntelliLink software. Check that the
Capacitor
Bank Switch Control Pulse Time
setpoint (on Page 2 of the
Setup>General
screen) is long enough. See Instruction Sheet 1023-530, “S&C IntelliCap® Plus
Automatic Capacitor Control:
Setup
,” for more information.
STEP 3.
Check the wiring. The wiring between the capacitor control and a bank switch may
be damaged or defective.
STEP 4.
Check the capacitor bank primary switch(es). The capacitor bank switch(es) may
be malfunctioning.
