DocID026400 Rev 1

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L9915

Electrical specification

20

3.3.3

Excitation fixed function

The excitation fixed function is active each time the COM duty cycle is between 4% and 8%.

Figure 8. State diagram

Table 8. Truth table for excitation fixed function

Mode

Frequency

on phase

terminal

COM

duty

cycle

Lamp terminal condition

Field terminal condition

Start delay

timer

1

< Turn On

Speed

6 ±2%

Lamp On

DFPreex (Pre-Excitation Duty Cycle)

N/A

2

< Turn On

Speed

No COM

Lamp On

DFPreex (Pre-Excitation Duty Cycle)

Off

3

< Turn On

Speed

 3% or

 9%

Lamp On

DFPreex (Pre-Excitation Duty Cycle)

N/A

4

> Turn On

Speed

6 ±2%

Lamp Off unless Fault

Detected

DFef (Excitation Fixed Duty Cycle

unless Phase regulation is required

N/A

5

> Turn On

Speed

 3% or

 9%

Lamp Off unless Fault

Detected

Normal Regulation set by COM

Off

6

> Turn On

Speed

No COM

Lamp Off unless Fault

Detected

Normal Regulation-Default setpoint

On