Comtech EF Data XTRT-400C Operation And Installation Manual page 53

Figure 5, Three Phase Delta Connection (NEU — Not Used) into Terminal Block
MNC-0300-070
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occur during initial turn on you will need to reverse a phase pair.
Generally the AC Prime Power receptacle is located on the rear
of the amplifier.
Figure 5 through Figure 8 show diagrams of three phase
connections.
Table 2 through Table 5 delineate the pinouts for the three
phase connections.
Table 2, Three Phase Delta Connection Pinouts
Terminal
A
Phase A
B
Phase B
C
Phase C
NEU
No Connection
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Unpacking and Installation
Connection
Revision 1