Vansco VMM3120, User Manual

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User Guide 57
Application Examples
software. Refer to the appropriate software manual, or contact your Parker
Vansco Account Representative for more details about software. This section
only provides hardware connection information.
When making the connection, it is highly recommended to use the high-side and
low-side outputs in pairs to avoid potential problems.

The high-side output would drive power to the valve coil and adjust the duty
cycle of a PWM signal.

The low-side output would be used as a return path to ground for the valve
coil, and provides feedback on the amount of current flowing through the
valve coil.
The application code should be written so that the PWM duty cycle for the output
is adjusted to achieve a target current through the valve coil.

If current feedback is lower than target, the PWM duty cycle should increase
to boost average current through the valve coil.

If the current feedback is higher than target, the PWM duty cycle should
decrease to reduce average current through the valve coil.
The following shows how to connect a high-side and low-side output to control a
proportional hydraulic valve:
Internal to product
Valve
Coil
Low-Side Output
with current sense
High-Side Output
(PWM)
Figure 26: Connection for controlling a proportional valve