Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 147)

Rockwell Automation Publication 193-UM015B-EN-P - June 2014 147
Protective Trip and Warning Functions Chapter 5
Over Frequency Inhibit Time
Over Frequency Inhibit Time (Parameter 373) allows the installer to inhibit an
over frequency trip and warning from occurring during the motor starting
sequence. It is adjustable from 0…250 seconds.
Table 136 - Over Frequency Inhibit Time (Parameter 373)
Under Frequency Trip
The E300 Electronic Overload Relay will trip 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 will flash a red 1-long / 5-short blink
pattern
• Bit 4 in Voltage Trip Status (Parameter 5) will set to 1
• Bit 0 in Device Status 0 (Parameter 20) will set to 1
• Any relay outputs configured as a Trip Relay will open
• Any relay outputs configured as a Control Relay will open
• Any relay outputs configured as a Trip Alarm will close
• Any relay outputs configured as a Normal Relay will be 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 Sec