Manual 36598 DSS-2 Two-Channel Digital Speed Switch
Woodward 1
Chapter 1.
General Information
Introduction
DSS-2 (Digital Speed Switch, 2-Channel) is a two-
channel electronic speed switch that combines the
convenience of manual adjustments with the flexibility
of a computer-based calibration tool. DSS-2 was
designed for use on engine applications where it can
perform a variety of speed related functions such as
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 can also be re-configured with the
ACT (All-purpose Calibration Tool) to function as an
engine autocrank controller or glow plug controller.
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). Electrical connections consist of thirteen wires and utilize a
Euro-style terminal strip. 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 from the factory, DSS-2 can be manually adjusted on most applications
that supply a MPU frequency of 2500 to 5000 Hz. Optionally, the user may attach
the calibration tool (ACT) to gain access to a number of user-adjustable features
including:
• Frequency range (200-15,000 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
• Autocrank: Configure crank disconnect speed range, crank time, rest time
and number of crank attempts
•
Glow plug preheat
Intended Usage
The DSS-2 is intended as a sub-system for integration into construction/commercial
and industrial engine systems by original equipment manufacturers and industrial
plants. It is not intended for consumer or on-highway vehicles or for use by the
general consumer/public. Typical applications include generator sets, compressors,
construction machinery and farm vehicles.
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