If desired, the Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK" feature can
be disabled in which case the screen will indicate "Disabled".
The user initializes the control at a given, known, tap position upon installation, by
selecting "INTERNAL KEEPTRACK" in the Tap Information screen in the
Configuration Menu and following the steps described later in this section. See
"Initializing Tap Position When Motor Direct Drive KeepTrack 'INTERNAL
KEEPTRACK' is Active" for detailed steps for entering the tap position using the HMI or
TCC600®.
Or, if the neutral tap position contact is connected to the control, run the regulator to
neutral as shown by the tap position indicator on the regulator. The control will recognize
the neutral light signal and set the tap position accordingly.
The Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK" procedure recognizes
tapchanges commanded via manual, automatic or external (SCADA) contacts. The power
source for the manual- or SCADA-initiated tapchanges must be the same as the motor
power source used for the automatic tapchangers.
The Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK" position knowledge is
based on the detection of a closed switch (manual or automatic), and feedback from the
operation counter input.
The method by which Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK" is
achieved is as follows:
The control includes two Zero Voltage Detection (ZVD) circuits. These circuits
individually monitor the AC voltage across the internal raise and lower triacs. This is done
since any external raise or lower contacts or manual switches have to be placed in parallel
with the triacs to run the tapchanger motor. When the triacs (or any contact paralleled
across the triacs) closes, the voltage measure decreases to almost zero. When a counter
input event is received while the raise circuit is activated, the Motor Direct Drive
KeepTrack "INTERNAL KEEPTRACK" will increment the tap count by one. When a
counter input event is received while the lower circuit is activated, the Motor Direct Drive
KeepTrack "INTERNAL KEEPTRACK" will decrement the tap count by one.
If the tapchanger reaches the mechanical tap limits of operation, (±16), limit switches
open up the appropriate circuit so the control cannot force a raise above +16, or force a
lower below –16. This is potentially confusing to the ZVD circuits, since they can see zero
voltage on the output with a closed triac and also see zero voltage on the other output due
to an open limit switch. When this condition is encountered, the control can only make a
best guess of which operation really occurs and moves one step in the direction of neutral,
which should be away from the side with the open limit switch.
An additional feature is the neutral zero feature. When a regulator passes through the
neutral position, a neutral contact closes. This is most often used to drive a neutral light
Section 6
1VAC388793-MB A
Configuration
458
TCC300
User Manual
Summary of Contents for TCC300
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