ABB TCC300, User Manual, Page: 563 / 716

The current input to the TCC300 is rated at 0.2 A continuous, 0.4 A for two
hours, and 4.0 A for 1 second.
Pin 5 Circulating Current Polarity
The circulating current transformer measures a relative reactive current flow between
transformers in parallel configuration. Maximum anticipated current input is 200 mA.
The current input to the TCC300 is rated at 0.2 A continuous, 0.4 A for two
hours, and 4.0 A for 1 second.
Pin 6 Circulating Current Return
This is the return path for Pin 5. The circulating current transformer input is isolated from
other pins.
Pin 7 Tapchanger Raise
This switched output connects the tapchanger raise winding to the source of motor power.
When the control calls for a raise, it is capable of switching up to 6 A at 120/240 Vac.
Pin 8 Motor Power Input
The source for powering the tapchanger motor is connected here. It may have a maximum
voltage of 240 Vac.
Pin 9
– Voltage Reduction Step #2
This digital input is typically enabled by connecting it to the n12 Vdc wetting
source (Pin 10), through an external Form "a" dry contact. The amount of voltage
reduction implemented is determined by the setting.
When "Contact KeepTrack
TM
1R1L" or "Contact KeepTrack 1N" Tap position
knowledge is selected the Voltage Reduction Step 2 Input is utilized as an "Auxiliary
Lower Contact Input". In the "Contact KeepTrack" method of Tap Position Knowledge,
Voltage Reduction Step 2 is still available through communications.
– Neutral Input Operation
When the parallel configuration mode is set to ΔVAR®2 (KeepTrack
TM
), the VR Step #2
input becomes the neutral input. This is due to the standard neutral input being used for
ΔVAR2 (Keeptrack) disable input when ΔVAR2 (Keeptrack) configuration is used.
1VAC388793-MB A
Section 8
Installation
TCC300 557
User Manual