Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 146)

146 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Overload Relay will trip on a phase rotation mismatch when this parameter does
not match the measured voltage phase rotation. It is user-adjustable, ABC or
ACB.
Table 134 - Phase Rotation Trip Type (Parameter 364)
Frequency Protection
The E300 Electronic Overload Relay has the capability to protect against poor
voltage quality by offering frequency based protection. This protection is used
when electric power is provided by stand-alone electric generators. The user can
prevent a contactor from energizing if the voltage frequency is either too high or
too low. The E300 Electronic Overload 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 the installer to inhibit an
under frequency trip and warning from occurring during the motor starting
sequence. It is adjustable from 0…250 seconds.
Table 135 - Under Frequency Inhibit Time (Parameter 369)
Default Value 1 = ABC
Range
1 = ABC
2 = ACB
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units
IMPORTANT The Phase Rotation Inhibit Time starts after a phase voltage transitions from
0V to 20V L-L. The E300 Electronic Overload 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 Sec