Woodward DSS-2 Digital Speed Switch
Two-channel electronic speed switch for internal combustion engines
Woodward’s DSS-2 combines the convenience of manual adjustments with the flexibility of a computer-based calibration tool. The two-channel electronic speed switch executes a variety of speed-related functions, including starter motor disable and engine overspeed protection. DSS-2 monitors engine rpm via a magnetic pickup (MPU) input and controls two independent relays. Once engine speed exceeds the user-selected speed setpoint, the relay will go to the designated set condition.
DSS-2 has two multi-turn potentiometers for manual speed setpoint adjustment. A computer interface is provided for additional adjustments with the All-purpose Calibration Tool (ACT). For most applications, DSS-2 can be connected and adjusted with simple hand tools. For more advanced features, the calibration tool provides user-friendly access. Three indicator lamps permit system monitoring and diagnosis without use of additional tools.
The unit is fully potted for harsh environments and comes with Euro-style connectors for easy installation. The DSS-2’s universal input accommodates both 12-volt and 24-volt systems. And, it is reverse-polarity protected to prevent damage in case of incorrect wiring.
• Digital technology for accuracy and reliability
• Versatility of a speed monitoring or equipment protection device
• Flexibility of either manual or PC-calibrated adjustments
• Easy attachment via Euro-style terminal
• Power input 9-30 Vdc
• CE marked
• Reverse polarity protection
As an electronic speed switch for internal combustion engines, DSS-2 performs in these typical engine applications:
• Crank motor disconnect above normal cranking speeds
• Engine overspeed protection
• Engine underspeed protection
• Engine load control (e.g. wood chipper--stop feed when engine lugs below a set speed, enable feed when engine speed recovers
As an equipment protection device, DSS-2 demonstrates its versatility in several functions:
• PTO protection
• Magnetic brake retarder
• Shift inhibitor
• Bus door control
DSS-2 can also function as the following:
• Autocrank controller
• Glow plug controller
Electrical
Power Input
|
9-30 Vdc, reverse polarity protected
|
Operating Current:
Both Channels On:
Both Channels Off:
|
12 V: 100 mA / 24 V: 100 mA
12 V: 50 mA / 24 V: 50 mA
|
Relay Contact Ratings @ 28 Vdc
|
Resistive Load: 1 to 10A
Inductive Load: 1 to 8A
|
Mechanical
Operating Temperature
|
-40°F to +185°F (-40°C to 85°C)
|
Vibration
|
4 G’s from 40 to 2000 Hz
|
Shock
|
10 G’s @ 45 Hz
|
Housing
|
UV, chemical resistant. UL 94 V-O flame retardant. Encapsulated for reliability in harsh environments
|
Terminations
|
Euro-style terminal block
|
Calibration
|
Manual or with PC-based All-purpose Calibration Tool / ACT [SA-5206]
|
Weight:
|
0.38 lbs (0.17 kg)
|