Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 82)

82 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Table 59 - FLA2 (Parameter 177)
USA & Canada Guidelines
• Motor Service Factor ≥ 1.15: For motors with a service factor rating of
1.15 or greater, program the FLA setting to the printed nameplate’s full
load current rating.
• Motor Service Factor < 1.15: For motors with a service factor rating less
than 1.15, program the FLA setting to 90% of the printed nameplate’s full
load current rating.
• Wye-Delta (Y-Δ) Applications: Follow the application’s service factor
instructions, except divide the printed nameplate’s full-load current rating
by 1.73.
Outside USA & Canada Guidelines
• Maximum Continuous Rated (MCR) Motors: Program the FLA setting
to the printed nameplate’s full-load current rating.
• Star-Delta (Y-Δ) Applications: Follow the MCR instructions, except
divide the printed nameplate’s full-load current rating by 1.73.
Trip Class
Trip Class is the second of two parameters that affect the E300 Electronic
Overload Relay’s thermal capacity utilization algorithm. Trip class is defined as
the maximum time (in seconds) for an overload trip to occur when the motor’s
operating current is six times its rated current. The E300 Electronic Overload
Relay offers an adjustable trip class range of 5…30. The user enters the
applications trip class into Trip Class (Parameter 172).
Table 60 - Trip Class (Parameter 172)
FLA2 (Parameter 177)
Default Value
0.50 (0.5…30 A Sensing Modules)
6.00 (6…60 A Sensing Modules)
10.00 (10…100 A Sensing Modules)
20.00 (20…200 A Sensing Modules)
Minimum Value 0.50
Maximum Value 65535.00
Parameter Type UDINT
Size (Bytes) 4
Scaling Factor 100
Units Amps
Trip Class (Parameter 172)
Default Value 10
Minimum Value 5
Maximum Value 30
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units