Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 113)

Rockwell Automation Publication 193-UM015B-EN-P - June 2014 113
Protective Trip and Warning Functions Chapter 5
Table 98 - L2 Under Current Trip Level Parameter 270)
L2 Under Current Warning
The E300 Electronic Overload Relay will indicate an L2 Under Current warning
if:
• No warning currently exists
• 2 Under Current Warning is enabled
• Current is present
• The Under Current Inhibit Timer has expired
• 2 Percent FLA (Parameter 48) is less than the L2 Under Current Warning
Level
When the L2 Under Current Warning conditions are satisfied, the:
• TRIP/WARN LED will flash a yellow 9-short blink pattern
• Bit 8 in Current Warning Status (Parameter 10) will set to 1
• Bit 1 in Device Status 0 (Parameter 20) will set to 1
• Any relay outputs configured as a Warning Alarm will close
L2 Under Current Warning Level
L2 Under Current Warning Level (Parameter 271) allows the user to define the
current at which the E300 Electronic Overload Relay will indicate a L2 Under
Current warning. It is user-adjustable from 10…100% for the FLA Setting
(Parameter 171).
Default Value 35
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
IMPORTANT The Under Current Inhibit Timer starts after the maximum phase of load
current transitions from 0A to 30% of the device’s minimum FLA setting. The
E300 Electronic Overload Relay does not begin monitoring for an under current
condition until the Under Current Inhibit Time expires.
IMPORTANT For any given application, the practical limit of the L2 Under Current Trip Level
(Parameter 270), will be dependent on the FLA Setting and the lower limit of
the E300 Electronic Overload Relay’s current measurement capability