228 Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6 Protective Trip and Warning Functions
Table 278 - Under kVA Trip Delay (Parameter 403)
Under kVA Trip Level
Under kVA Trip Level (Parameter 404) allows you to define the apparent power
(kVA) at which the E300 Electronic Overload Relay trips on an under apparent
power (kVA). It is user-adjustable from 0…2,000,000 kVA.
Table 279 - Under kVA Trip Level (Parameter 404)
Under kVA Warning
The E300 Electronic Overload Relay indicates an Under kVA warning if:
• No warning currently exists
• Under kVA Warning is enabled
• Current is present
• Voltage is present
• Under kVA Inhibit Time has expired
• The total apparent power (kVA) is equal to or less than the Under kVA
War n in g L e v el
When the Under kVA Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 2-long / 7-short blink pattern
• Bit 6 in Power Warning Status (Parameter 12) sets to 1
Default Value 1.0
Minimum Value 0.1
Maximum Value 25.0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 10
Units Seconds
Default Value 0.000
Minimum Value 0.000
Maximum Value 2,000,000.000
Parameter Type DINT
Size (Bytes) 4
Scaling Factor 1000
Units kVA
The Under kVA Inhibit Time starts after a phase voltage transitions from 0V to
20V L-L and a phase of load current transitions from 0 A to 30% of the
minimum FLA setting of the device. The E300 Electronic Overload Relay does
not begin monitoring for an under apparent power (kVA) condition until the
Under kVA Inhibit Time expires.
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