Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 36)

36 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 2 Installation & Wiring
Figure 14 - Overload Relay Mounting Placement
Figure 15 - External CT Connection Diagrams
External Potential Transformer (PT) Connection
The 193/592-EC5_ _ E3 Plus Overload Relay can be used with external step-
down PTs. The PT ratio is programmed into the E3 Plus Overload Relay by
entering the primary winding rating into PT Pri, Parameter 289, and the
secondary winding rating into PT Sec, Parameter 290. The voltage mode is also
programmed into the E3 Plus Overload Relay by selecting the appropriate mode
in Volt Mode, Parameter 156. The E3 Overload Relay Plus will support Wye,
Delta, and Open Delta voltage modes with potential transformers.
Primary
Current
Transformers
E3 Overload
Relay
6x
6x
or
NEMA
L1 L2 L3
L1/1 L2/3 L3/5
T1/2 T2/4 T3/6
E3
M
T1
T2
T3
IEC
L1 L2 L3
K1
L1/1 L2/3 L3/5
T1/2 T2/4 T3/6
E3
M
Primary
Current
Transformers
Primary
Current
Transformers