Rockwell-automation 592- E300 Overload Relay User Manual Manual de usuario Pagina 149

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Rockwell Automation Publication 193-UM015B-EN-P - June 2014 149
Protective Trip and Warning Functions Chapter 5
Table 138 - Under Frequency Trip Level (Parameter 371)
Under Frequency Warning
The E300 Electronic Overload Relay will indicate an Under Frequency warning
if:
No warning currently exists
Under Frequency Warning is enabled
Voltage is present
Under Frequency Inhibit Time has expired
The voltage frequency is equal to or less than the Under Frequency
Wa
r
n i ng Le ve l
When the Under Frequency Warning conditions are satisfied, the:
T
RIP/WARN LED will flash a yellow 1-long / 5-short blink pattern
Bit 4 in Voltage Warning Status (Parameter 11) will set to 1
Bit 1 in Device Status 0 (Parameter 20) will set to 1
Any relay outputs configured as a Warning Alarm will close
Under Frequency Warn Level
Under Frequency Warn Level (Parameter 372) allows the user to define
the frequency at which the E300 Electronic Overload Relay will indicate a
warning. It is user-adjustable from 46…65 Hz.
Table 139 - Under Frequency Warn Level (Parameter 372)
Default Value 57
Minimum Value 46
Maximum Value 65
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Hz
IMPORTANT
The Under 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 under frequency condition until the Under Frequency Inhibit Time
expires.
Default Value 58
Minimum Value 46
Maximum Value 65
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Hz
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