Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 108)

108 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Table 92 - Current Imbalance Warning Level (Parameter 262)
Line Under Current Protection
For non-motor applications when the measured current is less than a specific level
for a specific phase may indicate an electrical malfunction, such as bad resistive
heater element or non-operating incandescent light bulb. Such conditions may
not harm the power system, but it can lead to loss of production or certification
noncompliance.
The E300 Electronic Overload Relay can monitor for an under current condition
per phase with its Line Under Current Trip and Warning function to detect for a
rapid under current in a specific phase to minimize damage and loss of
production.
Under Current Inhibit Time
Under Current Inhibit Time (Parameter 265) allows the installer to inhibit an
L1, L2, and L3 Under Current trip and warning from occurring during a load
starting sequence. It is adjustable from 0…250 seconds.
Table 93 - Under Current Inhibit Time (Parameter 265)
L1 Under Current Trip
The E300 Electronic Overload Relay will trip with a L1 Under Current
indication if:
Default Value 20
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %
IMPORTANT The Current Imbalance Warning function does not include a time delay feature.
Once the Current Imbalance Inhibit Time has expired, the Current Imbalance
Warning indication is instantaneous.
Default Value 10
Minimum Value 0
Maximum Value 250
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Sec