ABB TCC300, User Manual, Page: 32 / 716

programmed number of tap positions depending on the tapchanger mechanism being
monitored. The modules accept current loop ranges of:
• 0 to 1 mA dc
• 0 to 2 mA dc
• -1 to +1 mA dc
• 4 to 20 mA dc
The Tap Information screen is provided in the tapchanger's Tap Settings Menu to select
whether the control uses the current loop method or the Motor Direct Drive KeepTrack™
method for tap position knowledge. The M
‑
2025B(D) Current Loop Interface module is
not used with the "KeepTrack™" method. The Motor Direct Drive KeepTrack method is
used with single-phase line regulators having a counter contact and a neutral contact. The
M
‑
2025B(D) module easily connects to the tapchanger control through a six-pin
connector located on the bottom of the control.
For parallel operation using the circulating current method, the following accessories are
needed: the M-0115A Parallel Balancing Module, the M-0127A AC Current Relay and
the M-0169A Auxiliary Current Transformer.
2.3.4 Backup relay
The M-0329B Backup Relay or the M
‑
5329 Multi phase Backup Relay are available to
provide protection against failure of the primary control.
2.3.5 M‑2026 AC-DC control power backup supply
The M
‑
2026 accepts either AC or DC input over a range of 21 to 32, 42 to 60 and 105 to
145 V. The unit will supply a reg12 Vdc at up to a 1.5 A output. The unit includes
a fused input, surge protection, and reverse polarity protection.
2.3.6 M‑2027 control power backup supply for AC only
The M
‑
2027 will accept an AC input over a range of 105 to 140 Vac at 50/60 Hz. The unit
will supply a +12 Vdc at up to 1.0 A output.
2.3.7 B-0920 control power backup harness
The B-0920 Control Power Backup Harness provides fused (3 A) power to TCC300 when
a M
‑
2026 or M-2027 Control Power Backup Supply is not used.
Section 2
1VAC388793-MB A
TCC300 overview
26 TCC300
User Manual