High Country Tek emc-3L - Manual (Page 35)

Ramp Up
When ramps are checked, Ramp Up is the Ramp from Min to Max Current. Ramps are applied for all current /
PWM% changes.
Range: 0.0 to 65.00 s
Output Selection
This is where the user selects the output configuration type
Range: Dual Coil High Side, Single Coil High Side, Single Coil Low Side, High-Side Only
Process P
Setting the P in the Process PI Loop
Range: 0 to 655.00
Process I
Setting the I in the Process PI Loop
Range: 0 to 655.00
Process I Time
The time in between updates to the Integral portion of the output correction for the Process PI Loop
Range: 0.10 to 10.000
Process Selection
Range: Current Regulation, Enable Process PI, Enable Current Ramps, PWM Duty Cycle Control and PWM
Frequency.
Each selection will activate the valid selection boxes.
Current Regulation
Current Regulation provides for automatic hardware and BIOS based adjustments to maintain the coil current at
the application code’s PWM% setting.
The Low-Side variable name sets the desired coil current. Example: Min 0 amp, Max 1 amp. Low-Side Name =
50% will cause the DVC hardware and BIOS to regulate the current to 500 ma or 50% of the current range.
This regulation will compensate for coil resistance variations typically caused by manufacturing tolerances,
increases in operating temperature and any other wiring resistances to and from the terminals of the coil.
Enable Process PI
Enable Process PI provides a facility where the application program sets a desired set-point value and then
continually determines a feedback variable. The hardware and BIOS then adjusts the coil current to close the
error between the feedback and the set-point. The feedback value is usually derived from a sensor that reflects
pressure or RPM and the set-point represents the target value.
The current to the Low-Side output is increased or decreased under BIOS control to make the Feedback and
the Set-point equal. In addition, the High Side activation is automatically switched for a Dual Coil configuration.
High Side 1 will be activated when the set-point is greater than the feedback and High Side 2 activated when the
set-point is less than the feedback. The Low-Side access variables are Low-Side Name.Set-point and Low-Side
Name.FeedBack. Both Set-point and FeedBack are variables from 0 to 100% or integer values from 0 to 1023.
This capability is generally used when the feedback signal to be regulated to is not the coil current but rather a
RPM or PSI reading from a sensor. The application program will convert the feedback sensors value to the
Low-Side Name.Feedback value. The current through the coil will increase to its maximum as long as the
feedback is less than the set-point and decrease to zero if the feedback is greater than the set-point. In a
P/N: 021-00163, Rev. A.0 - for V5.2 Tools Page | 35