Waveform - GE MM300 Instruction Manual

CHAPTER 6: DIAGNOSTICS

Waveform

MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Learned Starting Current
Range: 0.0 to 10000.0 A in steps of 0.1 A
The learned starting current is measured 200 ms after the transition of motor current
from zero to greater than overload pickup. This should ensure that the measured current
is symmetrical. The value displayed is the average of the last five successful starts. If
there are less than five starts, a value of 0 seconds will be averaged in for the full five
starts.
Learned Starting Capacity
Range: 0 to 100% in steps of 1
The learned starting capacity is used to determine if there is enough thermal capacity to
permit a start. If there is not enough thermal capacity available for a start, a start inhibit
will be issued. Starting will be blocked until there is sufficient thermal capacity available.
Average Motor Load Learned
Range: 0.00 to 20.00 × FLA in steps of 0.01
The MM300 can learn the average motor load over a period of time (fixed at 15 minutes).
The calculation is a sliding window of 15 minutes updated each minute. It is ignored
during motor starting, the motor must be running to update the Motor Load Learned.
The Home > Diag > Waveform page displays the MM300 waveform parameters. A typical
waveform page is shown below.
Figure 6-7: Waveform values
Trigger Date
Date of the current trigger.
Trigger Time
Time of the current trigger.
Trigger Cause
Range: None, Command, VO1 to VO32, Any Trip Pickup, Any Trip, Any Trip Dropout, Any
Alarm Pickup, Any Alarm, Any Alarm Dropout, Any Stop, Start A, Start B
Indicates the cause of the waveform trigger.
Trigger Frequency (Hz)
Measured system frequency at the time of the trigger event.
WAVEFORM
6–5