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Marathon Electric (a division of RBC Manufacturing Corp.) reserves the right to change specications and this manual without notice.
Revised 06/2011
Chassis Ground (GND)
The chassis ground terminal is labeled GND.
Power Supply Inputs (3 and 4)
Power input terminals are labeled 3 and 4.
Generator Voltage Sensing Inputs (E1, E2 and E3)
The generator voltage sensing terminals are labeled E1, E2, and E3. A single-phase sensing connection is
obtained by connecting the C-phase sensing input to terminals E2 and E3.
Exciter Field Output (F+ and F-)
The field output terminals for connection to the generator exciter field are labeled F+ and F-.
Single Phase Current Sensing Input (CT1 and CT2)
Generator line current is stepped down through a user-supplied current transformer (CT) on Phase B. Second-
ary current (5A) from that transformer is applied to terminals labeled CT1 and CT2. Consult current transformer
instruction manual for CT polarity identification and install per Figure 4-7. See Figure 4-4 and Table 4-2 for terminal
assignments.
Three Phase Current Sensing Input
Generator line current is stepped down through user-supplied current transformers. Secondary current (5A) from
thesetransformersisappliedtotheJ2connector.ConsultcurrenttransformerinstructionmanualforCTpolarity
identification and install per Figure 4-6. See Figure 4-4 and Table 4-2 for terminal assignments. Note: All transform-
ers should have the same CT ratio.
Terminal Name Description
GND Protective earth ground
4 PMG – terminal 1
3 PMG – terminal 2 (Fused)
E1 Generator armature – Phase A
E2 Generator armature – Phase B
E3 Generator armature – Phase C
F- Exciter stator field (-)
F+ Exciter stator field (+)
CT1 Generator Phase B CT (X1)
CT2 Generator Phase B CT (X2)
Table 4-1. Quick Disconnect Terminals
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