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 59)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 59
Protective Trip & Warning Functions Chapter 3
• minimum phase current is less than the UL Trip Level for a time period
greater than the UL Trip Delay.
If the E3 Overload Relay trips on an underload, the:
• TRIP/WARN LED will flash a red 7-blink pattern,
• bit 6 in Parameter 14, Trip Status, will set to “1”,
• bit 0 of Parameter 21, Device Status, will set to “1”,
• Trip Relay contact will open, and
• outputs will be placed in their Protection Fault State (if so programmed).
UL Inhibit Time, Parameter 45, allows the installer to inhibit an underload trip
from occurring during the motor starting sequence and is adjustable from 0…250
seconds.
UL Trip Delay, Parameter 46, allows the installer to define the time period that an
underload condition must be present before a trip occurs. It is adjustable from
0.1…25.0 seconds.
UL Trip Level, Parameter 47, allows the installer to define the current at which
the E3 Overload Relay will trip on an Underload. It is user-adjustable from
10…100%
➊ of the FLA Setting, Parameter 28.
➊
50…100% for devices with firmware revision (FRN) 1.003 and earlier.
Underload Warning
The E3 Overload Relay will immediately indicate an Underload warning if:
• no warning currently exists,
• Underload Warning is enabled,
• UL Inhibit Time has expired, and
IMPORTANT The Protection Fault State of OUT A and OUT B is defined by:
• OUTA Pr FltState, Parameter 65
• OUTA Pr FltValue, Parameter 66
• OUTB Pr FltState, Parameter 71
• OUTB Pr FltValue, Parameter 72
IMPORTANT The Underload Inhibit Timer starts after the maximum phase of load
current transitions from 0 A to 30% of the device’s minimum FLA setting.
The E3 Overload Relay does not begin monitoring for an underload
condition until the UL Inhibit Time expires.
IMPORTANT For any given application, the practical limit of the UL Trip Level,
Parameter 47, will be dependent on the FLA Setting and the lower limit
of the E3 Overload Relay’s current measurement capability. See Table 34
on page 142.