Rockwell Automation Publication 193-UM015D-EN-P - February 2015 203
Protective Trip and Warning Functions Chapter 6
Table 244 - Over Frequency Trip Delay (Parameter 374)
Over Frequency Trip Level
Over Voltage Trip Level (Parameter 375) allows you to define the frequency at
which the E300 Electronic Overload Relay trips on an over frequency. It is user-
adjustable from 46…65 Hz.
Table 245 - Over Frequency Trip Level (Parameter 375)
Over Frequency Warning
The E300 Electronic Overload Relay indicates an Over Frequency warning if:
• No warning currently exists
• Over Frequency Warning is enabled
• Voltage is present
• Over Frequency Inhibit Time has expired
• The voltage frequency is equal to or greater than the Over Frequency
War n in g L e v el
When the Over Frequency Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 1-long / 6-short blink pattern
• Bit 5 in Voltage Warning Status (Parameter 11) sets to 1
• Bit 1 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Warning Alarm closes
Default Value 1.0
Minimum Value 0.1
Maximum Value 25.0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 10
Units Seconds
Default Value 63
Minimum Value 46
Maximum Value 65
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Hz
The Over Frequency Inhibit Time starts after a phase voltage transitions from
0V to 20V L-L. The E300 Electronic Overload Relay does not begin monitoring
for an over frequency condition until the Over Frequency Inhibit Time expires.
To Next Page
Loading...
