Allen-Bradley E300 - Page 334

334 Rockwell Automation Publication 193-UM015E-EN-P - October 2015
Chapter 6 Protective Trip and Warning Functions
Underload Trip
The E300 relay trips with an underload indication if:
• No trip currently exists
• Underload Trip is enabled
• Current is present
• Underload Inhibit Time has expired
• Minimum phase current is less than the Underload Trip Level for a time
p
er
iod greater than the Underload Trip Delay.
If the E300 relay trips on an underload, the:
• TRIP/WARN LED status indicator flashes a red 6-short blink pattern
• Bit 5 in Current Trip Status (Parameter 4) sets to 1
• Bit 0 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Trip Relay open
• Any relay outputs configured as a Control Relay open
• Any relay outputs configured as a Trip Alarm close
• Any relay outputs configured as a Normal Relay are placed in their
P
rote
ction Fault state (if so programmed)
Underload Trip Delay
Underload Trip Delay (Parameter 256) allows you to define the time period an
underload condition must be present before a trip occurs. It is adjustable from
0.1…25.0 s.
IMPORTANT
The Protection Fault State of Relay 0, Relay 1, Relay 2, Digital Module 1 Output
Relays, Digital Module 2 Output Relays, Digital Module 3 Output Relays, and
Digital Module 4 Output Relays are defined by the respective parameters:
• Output PT00 Protection Fault Action (Parameter 304)
• Output PT00 Protection Fault Value (Parameter 305)
• Output PT01 Protection Fault Action (Parameter 310)
• Output PT01 Protection Fault Value (Parameter 311)
• Output PT02 Protection Fault Action (Parameter 316)
• Output PT02 Protection Fault Value (Parameter 317)
• Output Digital Module 1 Protection Fault Action (Parameter 322)
• Output Digital Module 1 Protection Fault Value (Parameter 323)
• Output Digital Module 2 Protection Fault Action (Parameter 328)
• Output Digital Module 2 Protection Fault Value (Parameter 329)
• Output Digital Module 3 Protection Fault Action (Parameter 334)
• Output Digital Module 3 Protection Fault Value (Parameter 335)
• Output Digital Module 4 Protection Fault Action (Parameter 340)
• Output Digital Module 4 Protection Fault Value (Parameter 342)