Rockwell-automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Pl User Manual Page 91

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Rockwell Automation Publication 193-UM002I-EN-P - December 2011 91
Protective Trip & Warning Functions Chapter 3
Preventive Maintenance
Diagnostics (E3 Overload
Relays Series C & Later)
The purpose of this section is to provide detailed information regarding the
Preventive Maintenance Diagnostic functions of the E3 Overload Relays Series C
and Later. In this section programming and monitoring parameters as they relate
to these functions will be discussed. For complete descriptions of the
programming parameters, Refer to Programmable Parameters on page 105.
Monitoring
Elapsed Time, Parameter 95, logs the hours of motor operation — the time
period that the E3 Overload Relay is sensing motor current present (must be
greater than 30% of the minimum Full Load Current (FLA) setting).
Starts Counter, Parameter 96, logs the number of starts — the number of times
motor current transitions from zero to a reported non-zero value (motor current
must be greater than 30% of the minimum Full Load Current (FLA) setting).
Start Inhibit
This protective function allows the installer to limit the number of starts in a
given time period. A start is defined as the E3 Overload Relay sensing a transition
in current from zero to a reported non-zero value (motor current must be greater
than 30% of the minimum Full Load Current (FLA) setting). The Start Inhibit
protective function can be set by: Starts/Hour and/or Starts Interval.
Start Inhibit Trip
The E3 Overload Relay will trip with a Blocked Start indication upon motor
stopping when:
no trip currently exists,
Start Inhibit is enabled,
the number of starts count within the past hour period equals the value set
in the Starts/Hour parameter, or
the time expired since the most recent start is less than the value set in the
Starts Interval parameter.
If the E3 Overload Relay trips on a Blocked Start, the:
TRIP/WARN LED will flash a red 16-blink pattern,
bit 15 in Trip Status, Parameter 14, will set to “1”,
bit 0 in Device Status, Parameter 21, will set to “1”,
Trip Relay contact will be open, and
IMPORTANT
The E3 Overload Relay will report 0 A or 0% FLA if the current is below
30% of the minimum FLA setting.
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