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NX100 Installation Manual Connecting transformer taps/load wiring
Issue 3.2 2017-03-31 Page 3-1
Section 3: Connecting transformer taps/
load wiring
1. Before connecting ac wiring to the transformer, set the line voltage tap selections. Based on
your line to line voltage under full load, select the appropriate tap position identified on the
labels mounted on the terminal board end of the transformer. One label identifies the tap
number and the line-to-line voltage. Another label identifies the tap. All phase connections
must be set to the same tap (see Figure 3.1 on page 3-2 and Table 3.1 ). If necessary, use the
hardware already on each of the three phase connections to connect them to the new tap
positions, noting that the end of each phase connection consists of four copper straps (see
Figure 3.2 on page 3-2 ). Ensure the four copper straps for each phase are evenly split (i.e.,
two on top of loop, two on bottom), and secured to both sides of the tap. Be sure to scrape
any excess epoxy off the electrical joint area.
Table 3.1: Three-phase primary winding tap nominal voltages (rms, phase-to-phase)
2. Remove the back cover from the transformer cabinet.
Note
:
It is important to choose the correct tap based on the loaded line-to-line voltage (i.e., the line voltage
present when the NX100 is operating at full power and full modulation) for maximum peak
modulation capability and maximum efficiency. If the loaded line-to-line voltage falls between two
tap settings, choose the higher voltage tap (this will maximize the NX100‘s power factor).
Voltage (V ac) Tap
340 6
360 5
380 4
400 3
420 2
440 1