Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

Page: 207 / 452

Date Code 20011009
SEL-701-1 Monitor
Metering & Monitoring
Motor Start Report
7.11
Motor Start Report
Each time the monitor detects a motor start, it stores a motor start report. The five
latest motor start reports are stored in nonvolatile memory. View any of the five latest
motor start reports using the serial port
MSR n command, where n = 1–5. Each report
consists of two parts: a summary and the start data.
Summary Data
Each motor start report contains a summary. The summary shows the following
information:
Date and time of the start.
Number of motor starts since last reset.
Motor acceleration time.
Starting % Thermal Capacity
(if the setting SETMETH=OFF, the monitor will always report 0.0).
Maximum Starting Current.
Minimum Starting Voltage, if voltages are present.
The motor acceleration time is calculated from the time the phase current
magnitude exceeds 2.5 times Full Load Amps until the current magnitude falls below
that level. The Starting % Thermal Capacity value is the thermal element capacity used
at the end of the start, expressed in percent of the trip value.
Start Data
The motor start data is taken every 5 cycles for 3600 cycles, starting 5 cycles after
the phase current magnitude exceeds 2.5 times Full Load Amps. The monitor stores the
following data every 5 cycles:
Magnitude of A-, B-, and C-phase currents.
Magnitude of neutral current, I
N.
% Thermal Capacity
(if the setting SETMETH=OFF, the monitor will always report 0.0).
Magnitude of AB, BC, and CA phase-to-phase voltages, if included.
The start data is output in a comma-delimited text format for easy integration into
computer spreadsheets for motor starting analysis.
Report Format
The motor start report comma delimited format makes the data easy to use with
spreadsheets or other visualization software. Use the MSR F serial port command to