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With Joystick, Potentiometer and Control System Interface
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Description:
The Dual Solenoid Multifunction Valve Driver provides
accurate control of hydraulic proportional and directional valves used in
mobile equipment and industrial processes, with input from a joystick,
potentiometer or control system interface. This multifunctional design will
support inputs from a joystick potentiometer with or without center tap, a
standard potentiometer or commonly available control signals such as 0 to 5
Volts, 0 to +/-5 Volts, 0 to 10 Volts, 0 to +/-10 Volts, 0 to 20 mA, and 0 to
+/-20 mA. The power supply connection is conditioned to withstand the harsh
environment found in vehicular power systems. Maximum current output is
adjustable from 0 to 2 Amps (300 mA and 100 mA output versions are available).
A high low range input provides reduced output for limited operation. The
driver is potted and packaged driver in a metal base. It holds an IP65 rating.
Flat tab style or screw terminal connections are provided. Contact the
manufacturer for OEM applications.
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Application:
The Dual Solenoid Multifunction Valve Driver
controls a variety of hydraulic valve combinations including:
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Features:
- High efficiency PWM with superimposed dither
- Glitch-free high-speed power up permits the entire electronics package to be powered from safety interlock trigger switches or joystick mounted microswitches, when safety is of primary concern
- High low range input provides reduced output for limited operation (i.e. training or operation in tight spaces)
- Pump enable output is active only when the joystick is active
- Fully sealed option for use in harsh environments (IP65 protection rating)
- Electronic overload protection
- Static and surge protection built in
- EMI/RFI resistant
- Adjustable deadband jumps
- Adjustable minimum current (0 to 2 Amps) and maximum current (0 to 2 Amps)
- Other current outputs are available
- Adjustable asymmetrical ramps (0.01 to 5 Seconds) with symmetrical ramps user selectable
- Center null to accommodate joystick or potentiometer centering errors
- Master/slave option permits only one axis to operate at a time
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Part
Number:
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Standard input, 0 to 2 Amp max.
output, tabs - DSDA-SMB-TB-01
Standard input, 0 to 2 Amp max. output, screw terminals -
DSDA-SMB-SC-01
Standard input, 0 to 300 mA max. output, tabs -
DSDA-SMB-TB-01-300MA
Standard input, 0 to 100 mA max. output, tabs -
DSDA-SMB-TB-01-100MA
1K pot input, 0 to 2 Amps max. output, tabs - DSDA-SMB-1K-TB
Specify the electronic joystick deadband if other than +/- 7.5 degrees.
Contact the manufacturer for OEM specific input signals, output current,
housing and connection styles.
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Terminology
Dither: Dither can be superimposed over a command signal to cause a
small vibration or barely detectable oscillation of the servo valve spool. This
reduces friction effects causing hysteresis and increases the linearity of the
valve. The generation of acoustical noise is also significantly reduced. These
are the effects that low frequency PWM is meant to cause. This design uses high
frequency PWM with superimposed dither with the advantage that amplitude and
frequency are user adjustable to suit the application.
Joystick Deadband: Deadband is the zone of the joystick or threshold of
the control signal where no action is generated by joystick movement or control
signal application. Deadband jump will be provided inherently by the safety
microswitches if they are installed on the customer's joystick. In this case,
the electronic deadband would normally be disabled. If the microswitches are
not installed, the same effect can be produced with an electronic threshold.
This feature can be enabled or disabled using onboard DIP switch 2. The
value of the deadband is factory set and can be specified to suit the
application.
Joystick Center Null: Center Null will be provided inherently by the
safety microswitches on the customer's joystick, if installed. If the safety
microswitches are not installed, the same effect can be provided by external
connections to the input side of the solenoid driver. If the joystick
potentiometer is connected to +5V Reference, its midpoint terminal should be
connected to +2.5V Reference. This ensures that the mechanical and electrical
centers of the joystick are consistent with each other.
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Multiple outputs are available to
support a variety of hydraulic circuits as described in Application. The diagram below shows the outputs from the
Dual Solenoid Multifunction Valve Driver as a reflection of the movement of a
remote joystick. The electronic joystick deadband (setting 5 on DIP
switch 2) was selected.
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Function:
Refer to the Connections, Input Settings and Adjustments
section for the layout of the terminals, user selectable settings and
adjustments.
To create the ABp signal to drive a single solenoid, externally short the SAL
and SBL terminals. Connect the solenoid to terminals SBL and either SAH or SBH.
(Note: SAH and SBH are internally connected.)
Refer to the diagram Output Signals Shown As Joystick
Movement for a definition of the output signals as a function of
joystick motion.
Maximum Output Current: Maximum output current is limited to 2.5 Amps
(min. current setting + max. current setting is less than or equal to 2.5A).
Disable: To disable the output when one joystick is involved, tie the
disable terminal to +10V or +Vps. DO NOT USE THIS INPUT FOR SAFETY CONTROL. A
separate external normally open switch on the input power is the best solution
as illustrated above.
For multiple axes joystick systems where one axis operates at a time, refer to
Master/Slave below.
Master/Slave: In a multi-axis system it is sometimes desirable to
prevent more than one axis from operating at a time. By connecting the
master/slave links together in parallel, using the Disable terminal, operation
will be limited to the first axis to be engaged.
Multiple Axis: The Dual Solenoid Driver is designed to accept the output
from a single axis of a joystick. For multi-axis applications, where more than
one axis operates at a time, use on Dual Solenoid Driver per axis.
Cd Output: The Cd output is useful for forward/reverse or up/down
applications. If the joystick is pushed forward past its deadband, the unit
will remain in forward mode unless the joystick is pulled into reverse past the
joystick's deadband of -7.5 degrees.
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Technical
Specifications:
All specifications typical at nominal input voltage and 25
degrees C unless otherwise specified.
General Specifications:
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Operating conditions
Storage temperature
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-40 to 85°C (-40 to 185°F)
-50 to 125°C (-58 to 257°F)
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Protection class
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Potted
IP65 rating
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Electrical connection
- Potted Driver
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Connection style - 22 flat tabs or screw terminals
(complete with mating vertical plug-in terminals)
Tab connection version mates with 0.25 inch female tab connector, supplied by
customer (Keystone P/N: 4470) and accepts 16-20 AWG wire
(Other connection styles are available to meet OEM requirements.)
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Dimensions
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Potted unit packaged in a metal base
3.87 x 5.37 x 1.17 inches or 98.4 x 136.5 x 29.7 mm (W x L x H)
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Input Specifications:
For proper operation, match the power supply voltage with
rating of coil. Operating the driver with a supply voltage lower than the
valve's rated voltage may result in reduced maximum current output.
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Operating voltage (power supply requirement)
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9 to 32 VDC power supply range
Reverse polarity protection
Total current draw will be the sum of the currents drawn by all connected
equipment plus 25 mA.
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Control input signal options -
voltage
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0 to 5 Volts (2.5V=0, +/-2.5V),
0 to 10 Volts (5V=0, +/-5V),
0 to +/-5 Volts (0V=0, +/-5V),
or 0 to +/-10 Volts (0V=0, +/-10V)
(user selectable by DIP switch SW1)
Other signal inputs are available. Contact manufacturer.
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Control input signal options -
current
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0 to 20 mA (10mA=0, +/-10mA),
or 0 to +/-20 mA (0mA=0, +/-20mA)
(user selectable by DIP switch SW2)
Other signal inputs are available. Contact manufacturer.
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Potentiometer input
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The potentiometer connection provides a 5.0
VDC bias voltage as well as a 2.5 VDC center-tap driving voltage. A remote
joystick potentiometer with or without center tap may be used. A 10K
potentiometer is recommended. The unit accepts pots from 5K to 50K Ohms. A 1K
pot input version is available.
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Low range input (Imax/2)
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This input, when active, will provide a 50%
reduction in output current slope. It is used to increase the resolution of
operation for limited operation such as when training new operators or during
operation in tight quarters. It is activated by applying power (+ 9-32 VDC) to
the Imax/2 tab and if not used, it may be left unconnected.
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Input resistance
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Voltage mode: 500 K Ohms
Current mode: 250 Ohms
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Output Specifications:
All outputs are capable of operating a 2 Amp solenoid or
relay. Each output can withstand an indefinite short circuit to power or
ground. Each output is protected from over-voltage with a re-circulating diode.
The solenoid coils and on/off valves should have no polarity or protection
diodes for proper operation of the device. The maximum current output of the
driver should not exceed the current rating of the solenoid coil.
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Range of maximum output current
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2000 mA, 300 mA or 100 mA (see part numbers)
Maximum output current is limited to 2.5A (min. current setting + max.
current setting <2.5A).
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Solenoid resistance selection
(nominal)
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Rcoil < (Vpower supply - 1.5
V)/I-max
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Minimum current setting (Solenoid A and
B)
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0 to 2.0A (adjustable) in 2A output version
0 to 300 mA (adjustable) in 300 mA output version
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Maximum current setting (Solenoid A and
B)
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0 to 2.0A (adjustable) in 2A output version
0 to 300 mA (adjustable) in 300 mA output version
The maximum current is offset by the minimum current setting.
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Current ramp time - up and down (Solenoid A
and B)
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0.01 - 5 seconds
(symmetrical/non-symmetrical user selectable by DIP switch 2)
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Dither amplitude
Dither waveform
Current dither frequency
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0 to 10% of maximum current (adjustable)
Triangular
70 to 350 Hz ±10% of full scale (adjustable)
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Connections,
Input Settings and Adjustments:
The metal base will accommodate up to 1/4
inch mounting screws (not supplied).
Adjustments to the single turn
potentiometers are made using a flat head or Philips screwdriver.
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Settings/Adjustments
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Range of Adjustment
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Input signals
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Select the appropriate current or voltage
signal.
(DIP switch 1)
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Minimum Current Setting (Imin) for Solenoid
A
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0 to 2000 mA* (CW=increase) in 2A output
version
0 to 300 mA (300 mA version)
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Maximum Current Setting (Imax) for Solenoid
A
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0 to 2000 mA* (CW=increase) in 2A output
version
0 to 300 mA (300 mA version)
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Minimum Current Setting (Imin) for Solenoid
B
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0 to 2000 mA* (CW=increase) in 2A output
version
0 to 300 mA (300 mA version)
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Maximum Current Setting (Imax) for Solenoid
B
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0 to 2000 mA* (CW=increase) in 2A output
version
0 to 300 mA (300 mA version)
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Imax /2
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Full speed (unconnected)
Half-speed (activated by applying 9-32 VDC through an external switch supplied
by customer)
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Symmetrical/Non-symmetrical
Ramps
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Symmetrical/non-symmetrical
(DIP switch 2)
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Rising Ramp Time for Solenoid A
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0.01 to 5 seconds (CW=increase;
CCW=decrease)
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Falling Ramp Time for Solenoid A
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0.01 to 5 seconds (CW=increase;
CCW=decrease)
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Rising Ramp Time for Solenoid B
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0.01 to 5 seconds (CW=increase;
CCW=decrease)
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Falling Ramp Time for Solenoid B
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0.01 to 5 seconds (CW=increase;
CCW=decrease)
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Dither Amplitude
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0 to 10% of maximum rated current
(CW=increase; CCW=decrease)
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Dither Frequency
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70 to 350 Hz (±10%)
Dither waveform is triangular.
(CW=increase; CCW=decrease)
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Deadband Jump
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+/- 7.5 degrees
(user selectable with DIP Switch 2)
Contact the manufacturer for custom deadband jump settings.
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* Maximum output current is limited to 2.5A (min.
current setting + max. current setting < 2.5A).
** If symmetrical ramps are selected, the rising ramp trim pot for each
solenoid should be used to set the ramp time and the falling ramp trim pot of
each solenoid is disabled.
CW=clockwise; CCW=counterclockwise
Specifications are subject to update without
notice.
Last Updated: June 21, 2002
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DATASHEET
For technical specifications download the
Datasheet provided in Adobe PDF format.
To request a faxed copy of the datasheet
please email sales@axiomatic.com and provide
the product name, part number, your contact information, telephone and fax
number. |
 Technical Data
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OEM and distributor pricing is available upon
request.
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