Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 71)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 71
Protective Trip & Warning Functions Chapter 3
Voltage Rotation Protection
Wiring of a three phase voltage system can effect the rotational direction of an
electric motor. The E3 Plus model EC5 can 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.
Voltage Rotation Trip
The E3 Overload Relay will trip with a Voltage Rotation indication if:
• no trip currently exists,
• Voltage Rotation protection is enabled,
• Ph Rot InhibitTime has expired, and
• V Phase Rot is not equal to the Ph Rot Trip.
If the relay trips on a Voltage Rotation, the:
• TRIP/WARN LED will flash red a 1 long and 5 short blink pattern,
• bit 4 in V Trip Status, Parameter 160, will set to “1”,
• bit 0 in Device Status, Parameter 21, will set to “1”,
• Trip Relay contacts will open, and
• outputs will be placed in their Protection Fault State (if so programmed).
Ph Rot InhibitTime, Parameter 223, allows the installer to inhibit a voltage
rotation trip from occurring during the motor starting sequence. It is adjustable
from 0…250 seconds.
Ph Rot Trip, Parameter 224, allows the installer to define the proper phase
rotation for the voltage system. It is adjustable from 1 (ABC) to 2 (ACB).
Voltage Rotation Warning
The E3 Overload Relay will indicate a Voltage Rotation warning if:
• no warning currently exists,
• Voltage Rotation warning is enabled,
• Ph Rot InhibitTime has expired, and
• V Phase Rot is not equal Ph Rot Trip.
When the Voltage Rotation warning conditions are satisfied, the following will
occur:
• TRIP/WARN LED will flash an amber 1 long and 5 short blink pattern,
• bit 4 in V Warn Status, Parameter 161, will set to “1”, and
• bit 1 in Device Status, Parameter 21, will set to “1”.