Rockwell Automation Publication 193-UM015D-EN-P - February 2015 49
Installation and Wiring Chapter 2
Table 13 - CT Primary (Parameter 263)
Table 14 - CT Secondary (Parameter 264)
You shall (1) provide one CT for each motor phase and shall (2) connect the
CT’s secondary leads to the appropriate sensing module power terminals. The
CTs shall be selected to be capable of providing the required VA to the secondary
load, which includes the E300 Sensing Module 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) be accurate to within ≤±2% over its normal operating
range. Typical CT ratings include:
• ANSI USA
• CSA (Canada)
• IEC (Europe)
• Class C5 BO.1
• Class 10L5
• 5 VA Class SP10
CT Primary (Parameter 263)
Default Value 5
Minimum Value 1
Maximum Value 65535
Parameter Type UINT
Size (Bytes) 2
Scaling Factor 1
Units Amps
CT Secondary (Parameter 264)
Default Value 5
Minimum Value 1
Maximum Value 65535
Parameter Type UINT
Size (Bytes) 2
Scaling Factor 1
Units Amps
ATTENTION: Improper configuration of the CT Ratio parameters can make the
E300 Electronic Overload Relay report inaccurate motor operational data and
possible motor damage.
The E300 Electronic Overload Relay trip on a configuration fault when the FLA
setting is outside of the legal range of the selected CT Ratio settings. The TRIP/
WARN LED status indicator flashes red 3-long, 8-short blinking pattern.
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