Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 151)

Rockwell Automation Publication 193-UM015B-EN-P - June 2014 151
Protective Trip and Warning Functions Chapter 5
Over Frequency Trip Delay
Over Frequency Trip Delay (Parameter 374) allows the installer to define the
time period an over frequency condition must be present before a trip occurs. It is
adjustable from 0.1…25.0 seconds.
Table 140 - Over Frequency Trip Delay (Parameter 374)
Over Frequency Trip Level
Over Voltage Trip Level (Parameter 375) allows the installer to define the
frequency at which the E300 Electronic Overload Relay will trip on an over
frequency. It is user-adjustable from 46…65 Hz.
Table 141 - Over Frequency Trip Level (Parameter 375)
Over Frequency Warning
The E300 Electronic Overload Relay will indicate 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
Warning Level
When the Over Frequency Warning conditions are satisfied, the:
Default Value 1.0
Minimum Value 0.1
Maximum Value 25.0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 10
Units Sec
Default Value 63
Minimum Value 46
Maximum Value 65
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Hz
IMPORTANT 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.