Tapchanger Control software. If these voltage reduction steps are instituted by
communications, the contacts are not being used simultaneously.
Table 68:
Multi-Step Voltage Reduction External Connections
Voltage Reduction Setpoint: Multiplier Range
Apply "Wetting Voltage" from Pin 10 to Pin #
Voltage Reduction Setpoint #1: 0 to 10%
Pin 18
Voltage Reduction Setpoint #2: 0 to 10%
Pin 9
Voltage Reduction Setpoint #3: 0 to 10%
Pins 18 and 9
When Contact KeepTrack
TM
Tap Position Knowledge is selected Voltage Reduction Step
1 (Pin 18) and Voltage Reduction Step 2 (Pin 9) are assigned as Auxiliary Tap position
inputs.
8.5
LTC backup control
The M
‑
0329B is a single
‑
phase, solid
‑
state backup control that prevents a defective
tapchanger control from running the voltage outside the upper and lower voltage limits.
The Block Raise and Block Lower voltage levels are set by accurately calibrated dials.
Refer to the M
‑
0329B Instruction Book for details.
The M
‑
0329B LTC Backup Control or M
‑
5329 Multi phase Backup Relay are connected
as a two
‑
terminal device to the voltage transformer.
8.6
Communication ports
The control includes three communication ports, COM1, COM 2, and COM3. COM2
supports RS
‑
232 or V-pin, RS
‑
485, and fiber optic lines (ST connector only). COM 3
supports Ethernet using an RJ
‑
45 connector or Fiber ST.
Selection of specific communication parameters may be made through the COM1 or
COM2 PORT configuration screen or the COM3 Port screen if the optional Ethernet port
is installed. USB is an internal port, and supports only MODBUS® protocol and software
updates. COM1 and COM2 support baud rates from 300 to 115200.
Fiber Optic Interface
The COM1 PORT screen allows the user to select the specific communication equipment
to be used: RS
‑
485 (2 wire) or Fiber Optics (ST connector).
Section 8
1VAC388793-MB A
Installation
562
TCC300
User Manual
Summary of Contents for TCC300
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