Allen-Bradley E300 - Page 317

Rockwell Automation Publication 193-UM015E-EN-P - October 2015 317
Protective Trip and Warning Functions Chapter 6
Overload Reset Level (Parameter 174) is adjustable from 1 to 100% TCU. The
following figures illustrate the typical overload reset time delay when Overload
Reset Level is set to 75% TCU.
Figure 211 - Overload Reset Times
Overload Warning
The E300 relay indicates an overload warning if:
• No warning currently exists
• Overload warning is enabled
• Current is present
• % Thermal Capacity Utilized is equal to or greater than Overload Warning
Level
Whe
n the overload warning conditions are satisfied, the:
• TRIP/WARN LED status indicator flashes a yellow short-1 blink pattern
• Bit 0 in Current Warning Status (Parameter 10) sets to 1
ATTENTION: In explosive environment applications, Overload Reset Mode
(Parameter 173) must be set to Manual.
ATTENTION: In an explosive environment application, Overload Reset Level
(Parameter 174) must be set as low as possible or in accordance with the motor
thermal time constant.
Time to Reset in Seconds
OL Reset Level (% TCU)
0 100 200 300 400 500
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
10
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
OL Reset Level (% TCU)
Time to Reset in Seconds
Trip Class 5 Trip Class 10 Trip Class 20 Trip Class 30