Delta MM300 Instruction Manual download pdf (Page 152)

CHAPTER 7: DIAGNOSTICS LEARNED DATA

MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 7–7

7.5 Learned data

The Home > Diag > Learned page displays the MM300 learned data parameters. A typical

learned data page is shown below.

Figure 6: Learned data values

The MM300 learns the acceleration time, the starting current, the starting capacity, and

the average motor load during motor starts. This data is accumulated based on the last

five successful starts.

Learned Acceleration Time

Range: 0.0 to 200.0 ms in steps of 0.1 s

If motor load during starting is relatively consistent, the learned acceleration time may

be used to fine tune the acceleration protection. Learned acceleration time will be the

greatest time of the last five successful starts. The time is measured from the transition

of motor current from zero to greater than overload pickup, until line current falls below

the overload pickup level.

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 and is ignored during motor starting.

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Delta MM300 Instruction Manual Page 152