High Country Tek emc-3L - Manual (Page 32)

3.15 Output Groups
The three DVC710 Output Groups are used to configure and
control valves. Each group has 2 programmable voltage source
output pins (High-Side) and one output (2 Low-Side current
sensing and sinking) pin. This pin is thought of as an output even
though it receives current and measures it. This is because the
Low-side pin using circuits internal to the DVC module also
controls the amount of time (duty cycle) the current sinking mode
is active by the application setting the output PWM% (Pulse Width
Modulated) variable. The PWM% represents the effective coil
voltage. This effective voltage will equal the PWM% times the
system voltage.
The DVC710 controllers can control two kinds of valves. The first
type is Bang-bang valves or quick opening valves that are fully on
or off. The second type is Proportional valves (PWM% controlled)
that are controlled by continuously measuring the received coil
current and comparing the value to a desired value and adjusting
the PWM% up or down to correct the error.
The output groups are designed to give the user a great deal of
flexibility. The software gives the user the ability to control the
voltage (High-Side) to the positive side of the coil and control the
PWM current sinking capability (PWM OUT) from the negative
side of the coil. Refer to the Appendices for a more in depth
discussion of PWM, Dither and the PID technique used to regulate coil current.
HIGH-SIDE OUTPUTS (HS OUT) – Qty 6
These outputs are designed to source (supply) power supply voltage when enabled. Each output is short circuit
protected and has open circuit detection. Open circuit detection will only be tested when the output is switched
on or off. The maximum current per output capability is 3 Amps.
PWM OUTPUTS (PWM OUT) – Qty 3
These outputs are designed to sink current to ground at the PWM frequency (19 kHz). Each output can be
configured for a specified current range for maximum current sensing resolution. All outputs are short circuit
protected and have open circuit and short circuit detection.
Output Group Configuration
Each Output group can control from 2 to 3 coils representing 1 to 3 valves depending on the valve types.
The four supported valve control configurations are namely:
Output Configuration Screen
• Dual Coil High Side
• Single Coil High Side
• Single Coil Low Side
• High-Side Only
P/N: 021-00163, Rev. A.0 - for V5.2 Tools Page | 32