High Country Tek emc-3L - Manual (Page 9)

output functionality to support a wide range of hydraulic applications. Should more capability be needed than
provided by a single DVC710, multiple interconnected DVC710 s may be used and share information via the
J1939 CAN bus.
The DVC710 comes in one version. It supports the DVC61 text display or a J1939 Graphical display. The
RS232 port on the DVC710 is typically used for loading and monitoring your application program. Four light
emitting diodes (LEDs) mounted on top of the DVC710 module also are useful for monitoring your system’s
operational status.
The DVC710 has 3 Universal inputs (programmable to accept the most common sensor inputs), 3 0 – 5 Volt
analog inputs (programmable for joysticks and potentiometers) and 8 digital/pulse inputs with digital input 1 able
to be configured as an SYSTEM DISABLE input.
The DVC710 has a single +5 volt regulated reference output. This reference can supply up to a total of 500ma
of current. Multiple devices with varying current requirements can be connected to this reference. Only the
total load current of 500ma needs to be adhered too.
In addition, the DVC710 has 6 High-Side (voltage and current sourcing) outputs and 3 Low Side PWM (pulse
width modulation) outputs for bang-bang and proportional 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 current regulated proportional valve 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 DVC710 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 DVC710.
The DVC710 has four programmable LEDs located on top of the module. The Module Status and Network
Status LEDs can be programmed to be on either side of the module insuring their visibility in spite of the
DVC710’s orientation.
Also the DVC710 can connect to the CAN Bus via DVC DeviceNet and/or J1939.
1.4 System Configurations
The DVC7xx family is designed to control the simplest to most complex machines. Four different configurations
are supported namely:
DVC710 standalone with optional J1939 Graphical Display or DVC61 Display
DVC710 directly connected to J1939 Engine Control systems over a CAN Bus/Device Net cable
DVC710 multiple slave J1939 sub system control
DVC710 with multiple CAN Bus connected DVC Input / Output expansion and Display modules
1.5 DVC710 CAN Bus
The DVC 710 supports two separate CAN Bus networks. CAN Bus 1 will simultaneously communicate on the
J1939 bus and the DVC CAN Bus. This means that the user may use the DVC710 to talk to both the J1939 bus
and for example a DVC61 Display at the same time and on the same physical bus. The DVC61 uses an 11 bit
Identifier rather than the 29 bit identifier that J1939 uses; therefore systems that
do not employ a high network load may run both at the same time on the same
physical bus without any message degradation saving cabling and labor costs.
CAN Bus 2 will support J1939 messages only and may be used in tandem or
separately from CAN Bus 1 depending on the needs of the application and
P/N: 021-00163, Rev. A.0 - for V5.2 Tools Page | 9