3.1.2
Status indicators
RAISE LED
The Raise LED (yellow) illuminates when the voltage is below the lower band edge and
the timer has started timing for a tapchanger Raise operation.
LOWER LED
The Lower LED (yellow) illuminates that the voltage is above the upper band edge and the
timer has started timing for a tapchanger Lower operation.
REV PWR LED
The Reverse Power LED (red) will illuminate to indicate when the unit detects reverse
power flow.
OK LED
The OK LED (green) will remain illuminated whenever power is applied to the unit and
the control is functioning properly. The OK LED will also extinguish when a Motor Seal-
in Failure Block is in effect.
ALARM LED
The Alarm LED (red) will illuminate when any of the Programmable Alarm Functions set
the output relay to true.
V/RED LED
The Voltage Reduction LED (yellow) will flash corresponding to the level of Voltage
Reduction that has been invoked. This is true for any Voltage Reduction process whether
it came from an external contact, any Comm input or HMI.
•
1 Flash for Level 1 Voltage Reduction
•
2 Flashes for Level 2
•
3 Flashes for Level 3
MANUAL LED
The Manual LED (red) will illuminate when Auto operation of the control has been
blocked from any Com port. It will also illuminate when Manual Mode has been selected
using the Adapter Panel Auto/Manual Push button or Toggle switch.
LOCAL LED
The Local LED (yellow) will illuminate when all SCADA write capability to the control
is blocked.
Section 3
1VAC388793-MB A
Operation
34
TCC300
User Manual
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