8800-1001 DSS-2 Two-Channel Digital Speed Switch

The DSS-2 is a two-channel electronic speed switch 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. The 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 speed setpoint adjustment. A serial

interface is provided for additional adjustments with the All-purpose Calibration Tool

(ACT).

DSS-2 can be re-configured with the ACT to act as a glow plug controller or engine

autocrank controller.

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.

8800-1001

DS

S-2 has thirteen Euro-style screw terminals for:

• Battery Positive and Negative (9-30 Vdc). Reverse voltage protected
• Two form-C relays (10A continuous). Independent Common (C), Normally Closed

(NC) and Normally Open (NO) contacts are provided. DSS-2 is factory

programmed for standard relay logic (relay de-energized below set speed), but

may be modified with the ACT for reverse relay logic (relay energized below set

speed). External diodes should be added for transient suppression with inductive

loads.

• Magnetic Pickup (MPU) Positive and Negative (2 Vac minimum at 1000 Hz). The

controller is factory programmed for 2500 to 5000 Hz. This range may be modified

with the All-purpose Calibration Tool (ACT) to cover

10-10,000 Hz or operate in units of rpm.

• Reset Switch Input (RST): A switch to battery positive switch input is provided for

manual reset functions. DSS-2 is factory programmed for automatic reset at 80%

of set speed, but may be modified with the ACT for manual or latched reset.

• Engine Protection Switch Input (EP): A switch to battery positive switch input is

provided for connection to external engine protection devices.

• Verify Switch Input (VER): A switch to battery positive switch input is provided

for a verify function. Activating this switch will reduce both channel set

frequencies to 70% of their normal values.

Use insulated, automotive grade wiring (minimum 18 AWG or 1 mm 2 ) for all connections. Shielded

wiring is recommended for the MPU.

To

use the external connections:

1. Loosen the terminals with a small blade screwdriver.
2. Strip wire.
3. Insert wire into terminal hole.
4. Tighten terminal with a small blade screwdriver