196 Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6 Protective Trip and Warning Functions
Voltage Imbalance Warning Level
Voltage Imbalance Warning Level (Parameter 368) allows you to define the
percentage at which the E300 Electronic Overload Relay indicates a warning. It is
user-adjustable from 10…100%.
Table 236 - Voltage Imbalance Warning Level (Parameter 368)
Phase Rotation Protection
Wiring of a three-phase voltage system can affect the rotational direction of an
electric motor. The E300 Electronic Overload Relay can help protect against the
improper phase rotation so that an electric motor rotates in the proper direction,
ABC or ACB, to prevent equipment from being damaged.
Phase Rotation Inhibit Time
Phase Rotation Inhibit Time (Parameter 359) allows you to inhibit a phase
rotation mismatch trip and warning from occurring. It is adjustable from 0…250
seconds.
Table 237 - Phase Rotation Inhibit Time (Parameter 363)
Phase Rotation Trip
The E300 Electronic Overload Relay trips with a Phase Rotation indication if:
• No trip currently exists
Default Value 10
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %
The Voltage Imbalance Warning function does not include a time delay feature.
Once the Voltage Imbalance Inhibit Time has expired, the Voltage Imbalance
Warning indication is instantaneous.
Default Value 10
Minimum Value 0
Maximum Value 250
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Seconds
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