Rockwell Automation Publication 193-UM015D-EN-P - February 2015 199
Protective Trip and Warning Functions Chapter 6
Table 240 - Over Frequency Inhibit Time (Parameter 373)
Under Frequency Trip
The E300 Electronic Overload Relay trips with an Under Frequency indication
if:
• No trip currently exists
• Under Frequency Trip is enabled
• Voltage is present
• Under Frequency Inhibit Time has expired
• The voltage frequency is less than the Under Frequency Trip Level for a
time period greater than the Under Frequency Trip Delay.
If the E300 Electronic Overload Relay trips on an under frequency, the:
• TRIP/WARN LED status indicator flashes a red 1-long / 5-short blink
pattern
• Bit 4 in Voltage Trip Status (Parameter 5) 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
Protection Fault state (if so programmed)
Default Value 10
Minimum Value 0
Maximum Value 250
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Seconds
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