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 35)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 35
Installation & Wiring Chapter 2
Overload Relay power terminals as shown in Figure 14 on page 36 . The CTs shall
have an appropriate ratio rating as detailed in Table 18.
Additionally, the CT shall be selected to be capable of providing the required VA
to the secondary load, which includes the E3 Overload Relay burden of 0.1 VA at
the rated secondary current and the wiring burden.
Finally, the CT shall (1) be rated for Protective Relaying to accommodate the
high inrush currents associated with motor startup and shall (2) have an accuracy
of
≤ ±2% over its normal operating range. Typical CT ratings include:
Installation Requirements
• The 193-EC_ZZ Overload Relays are designed to be installed in193-
ECPM2 Panel Mount Adapters and connected to separately mounted
current transformers.
• For 193-ECPM2 Panel Mount Adapter assembly, refer to the instructions
included with the panel mount adapter.
• The E3 Overload Relay must be mounted a distance equal to or greater
than six times the cable diameter (including insulation) from the nearest
current-carrying conductor or current transformer.
• For applications employing multiple conductors per phase, the diameter of
each cable should be added and multiplied by six to determine the proper
placement distance for the E3 Overload Relay.
• ANSI USA
• CSA (Canada)
• IEC (Europe)
• Class C5 BO.1
• Class 10L5
• 5 VA Class SP10
ATTENTION: The improper selection of a current transformer can result
in the E3 Overload Relay reporting inaccurate motor operational data and
possible motor damage. The selected current transformer must be rated
for protective relaying applications.
ATTENTION: Placing the E3 Overload Relay closer than the
recommended distance, six times the cable diameter (including
insulation), may compromise its current reporting and protection
capabilities.