
GUID-234E3B5D-5D29-4A3C-983C-8428572CD49F V1 EN
Figure 316:
Regulator Type
The Type "A" non-inverted configuration regulator includes a wire jumper on the NN
terminal block for Potential Transformer tap selection.
On the older regulator controls (those not having power disconnect and CT shorting knife
switches), the PT tap selection jumper is usually connected between terminals NN-9 and
NN-20, NN-21 or NN
‑
22. On newer regulator controls, (those with power disconnect and
CT shorting knife switches), the PT tap selection jumper is usually connected between
terminals NN-8 and NN-20, NN-21 or NN-22. There are special cases when a PT ratio
correcting transformer is supplied and the jumper position is different. In all cases consult
the regulator tank nameplate for the proper jumper connections.
The Type "B" inverted configuration regulator is supplied from the factory with a standard
0.75 ohm resistor installed on the NN terminal block in addition to the PT tap selection
jumper. This series resistor limits short circuit currents in the event of an external fault.
On the older regulator controls (those not having a power disconnect and CT shorting
knife switches), the resistor is usually connected between terminals NN-9 and NN-22. The
PT tap selection jumper is usually connected between terminals NN-22 and NN-20 or
NN-21. On newer regulator controls, (those with power disconnect and CT shorting knife
switches) the resistor is usually connected between terminals NN-8 and NN-22. The PT
tap selection jumper is usually connected between terminals NN-22 and NN-20 or NN-21.
In all cases, consult the regulator tank nameplate for the proper jumper connections.
The control can be damaged if the PT tap selection jumper is not
connected properly when the regulator is energized.
The control is not powered if either the PT tap selection jumper or resistor is missing or
open.
Section 6
1VAC388793-MB A
Configuration
386
TCC300
User Manual
Содержание TCC300
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