378 Rockwell Automation Publication 193-UM015E-EN-P - October 2015
Chapter 6 Protective Trip and Warning Functions
Table 303 - Phase Rotation Trip Type (Parameter 364)
Frequency Protection
The E300 relay has the capability to help protect against poor voltage quality by
offering frequency-based protection. This protection is used when electric power
is provided by stand-alone electric generators. You can prevent a contactor from
energizing if the voltage frequency is either too high or too low. The E300 relay
can monitor for this condition with its Over and Under Frequency Trip and
Warning function, and it can detect for an improper voltage frequency to
minimize motor damage and loss of production.
Under Frequency Inhibit Time
Under Frequency Inhibit Time (Parameter 369) allows you to inhibit an under
frequency trip and warning from occurring during the motor starting sequence. It
is adjustable from 0…250 seconds.
Table 304 - Under Frequency Inhibit Time (Parameter 369)
Over Frequency Inhibit Time
Over Frequency Inhibit Time (Parameter 373) allows you to inhibit an over
frequency trip and warning from occurring during the motor starting sequence. It
is adjustable from 0…250 seconds.
Table 305 - Over Frequency Inhibit Time (Parameter 373)
Default Value 1 = ABC
Range
1 = ABC
2 = ACB
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units
The Phase Rotation Inhibit Time starts after a phase voltage transitions from
0V to 20V L-L. The E300 relay does not begin monitoring for a phase rotation
mismatch condition until the Phase Rotation Inhibit Time expires.
Default Value 10
Minimum Value 0
Maximum Value 250
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Seconds
Default Value 10
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