High Country Tek DVC80 - Manual (Page 11)

P/N: 021-00154, Rev. A.6 - updated for V4.7 Tools Page | 11
In addition, the DVC10 has 6 High-Side (voltage and current sourcing) outputs and 3 PWM (pulse width
modulation) outputs for proportional and bang-bang valve control. The High-Side outputs provide +POWER
(system power typically 12-24 volts) when enabled by your program to the coils used to open or close your
valves. The PWM outputs serve two functions for proportional valve coil current closed loop control. First, they
provide the current return path from the negative side of the coil. This current is measured and compared to the
desired coil current. Given the difference between the desired and actual current the PWM pulse output duty
cycle (i.e. the percent of time current is allowed to flow through the coil) is adjusted to eliminate this error or
difference. The internal DVC10 circuitry and BIOS automatically adjust this PWM duty cycle and therefore the
effective voltage (and current) seen by the coil. This regulated valve coil current provides a constant valve
output (i.e. spool position), which is unchanged by coil resistance, connection length or power supply
fluctuations. The High-Side and PWM outputs can be used stand-alone or in conjunction with one another to
support the wide combination of valve types you may have in your system. From 3 to 9 valves depending on
the valve types can be controlled by a single DVC10. The DVC50 expansion module allows you to control more
valves if needed.
Comparing the three DVC controllers
Below is a chart comparing the main features of the new DVC7 along with that of the DVC5 and DVC10.
DVC7 DVC10
Valves 4 to 8 3 to 9
High Side Outputs 6 6
PWM Outputs 2 3
Digital Inputs 3 8
Analog Inputs 2 3
Universal Inputs 3 3
Pulse Inputs 6 3
RS232 Yes Yes
CAN DeviceNet/J1939 Yes Yes
500ma Reference Output Yes No
5V->1kohm Reference Outputs No Yes
1.5 System Configurations
The DVC family is designed to control the simplest to most complex machines. Four different configurations are
supported namely:
DVC5/7/10 standalone with optional Graphical Display, DVC61 Display or DVC62 Display keypad
DVC5/7/10 directly connected to J1939 Engine Control systems over a CAN Bus/Device Net cable
DVC5/7/10 multiple sub system control with CAN Bus synchronization
DVC10 with multiple CAN Bus connected DVC Input / Output expansion and Display modules
These system configurations are illustrated below and on the next page: