Woodward DSS-2, Two Channels Digital Speed Switch (With Calibration ).
APPLICATIONS
Woodward’s DSS-2 is a multipurpose electronic device suitable for diverse applications. While protecting engines from overspeed or underspeed conditions DSS-2 also protects system equipment from the needless wear and damage brought about by these conditions. For example, DSS-2 will shut down a motor, an engine, or a piece of equipment if it detects underspeed, thereby preventing conveyors from jamming, compressors from freezing, belts and drives breaking, and motor windings from overheating.
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
DESCRIPTION
Compact, yet powerful, 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.
As shipped, DSS-2 can be manually adjusted on most applications that supply a MPU frequency of 2500 to 5000 Hz. Optionally, the ACT may be attached to gain access to a number of user-adjustable features including:
• Frequency range (10-10,000 Hz) • Normal and reverse mode
operation
• Automatic, Manual or Latched reset
• Set condition on Engine Protection (EP) switch on
• Set condition on loss of speed signal
• Set condition on Start Switch (VER) off
Product Specification 36597
• Digitaltechnology for accuracy and reliability
• Versatilityofa speed monitoring or equipment protection device
• Flexibilityofeither manual or PC- calibrated adjustments
• Easyattachment via Euro-style terminal
• Powerinput 9-30 Vdc
• CEmarked
• Reversepolarity protection
SPECIFICATIONS
Woodward P/N: 8800-1001
Electrical:
Power Input : 9-30 Vdc, Reverse polarity protected
Electromagnetic Compatibility: ISO 14982:1998/E
Resistive Load: 1 to 10A Inductive Load: 1 to 8A
Operating Current:
Both Channels On: 12 V: 100 mA / 24 V: 100 mA
Both Channels Off: 12 V: 50 mA / 24 V: 50 mA
Mechanical:
Operating Temperature: -40°F to +185°F (-40°C to 85°C)
Vibration : 4G’sfrom40to2000Hz
Shock: 10G’s@45Hz
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)
