Woodward

Woodward ESSE Speed Switches

    Single- and dual-channel speed switches for critical speed functions

    ESSE-1.jpg 

     ESSE switches monitor and control critical speed functions such as:

    • Crank disconnect or overspeed protection
    • Transmission shift inhibiting
    • PTO protection

    The switches are adaptive to most speed-related switching functions on diesel and gas engines and other rotating machinery. In addition to generator sets, starter motors, and engines, ESSE switches are also used on diverse equipment such as conveyor belts, bus doors, and magnetic brake retarders.

    Both single and dual setpoint models are potted for protection against harsh environments and have proven to be reliable and rugged as well as flexible and cost effective.

    To learn more about Woodward speed switches or where to buy them, click on the globe below.

    Global Network of Woodward Sales Offices and Distributors 

     

     
    • Standard or reverse relay operation
    • Field adjustable set and reset switch points
    • High noise immunity
    • Latch, automatic, manual or adjustable resets
    • Reverse polarity protection
    • Variety of speed signal inputs

     

     

    Electrical 

    Input Voltage Range: 

    8–40 Vdc

    Maximum Operating Current 

    @ 40 V: 

    @ 24 V: 

    @ 12 V: 

     

    165 mA

    140 mA

    125 mA

    Maximum Standby Current 

    @ 40 V: 

    @ 24 V: 

    @ 12 V: 

     

    70 mA

    45 mA

    30 mA

    Relay Contact Ratings 

    28 Vdc Resistive Load: 

    28 Vdc Inductive Load: 

     

    0.1–10 A

    0.1–8 A

    Power Supply Transient Protection: 

    900 Vdc  for 100 μs exponential decay

    140 Vdc  for 1 ms

    110 Vdc  for 0.45 s exponential decay

    Reverse Polarity Protection: 

    1000 Vdc

    Signal Input 

    Minimum: 

    Maximum: 

     

    1.2 Vrms 

    130 Vrms 

    Signal Input Impedance: 

    33K Ohms (nominal)

    Stability @ 9 Vdc to 40 Vdc 

    and 14°F to +185°F (-10°C to +85°C):  

    Less than 1% or 8 Hz, whichever is greater. Unit performs to -40° F (-40° C)

     

    Environmental

    Operating Temperature: 

    -40°F to +185°F (-40°C to +85°C)

    Vibration: 

    4.2 G’s from 20 to 500 Hz

    Shock: 

    4’ drop test

    Case: 

    Nickel plated terminals. Humidity and salt spray resistant. Potted for environmental protection

    Weight: 

    1.5 lbs (0.68 kg)

      

    Performance

    Overspeed Response Time: 

    75 ms typical


     

     

     

    Electrical

    Input Voltage Range: 

    8–40 Vdc

    Maximum Operating Current 

    @ 40 V: 

    @ 24 V: 

    @ 12 V: 

     

    165 mA

    140 mA

    125 mA

    Maximum Standby Current 

    @ 40 V: 

    @ 24 V: 

    @ 12 V: 

     

    70 mA

    45 mA

    30 mA

    Relay Contact Ratings 

    28 Vdc Resistive Load: 

    28 Vdc Inductive Load: 

     

    0.1–10 A

    0.1–8 A

    Power Supply Transient Protection: 

    900 Vdc  for 100 μs exponential decay

    140 Vdc  for 1 ms

    110 Vdc  for 0.45 s exponential decay

    Reverse Polarity Protection: 

    1000 Vdc

    Signal Input 

    Minimum: 

    Maximum: 

     

    1.2 Vrms 

    130 Vrms 

    Signal Input Impedance: 

    33K Ohms (nominal)

    Stability @ 9 Vdc to 40 Vdc 

    and 14°F to +185°F (-10°C to +85°C):  

    Less than 1% or 8 Hz, whichever is greater. Unit performs to -40° F (-40° C)

     

    Environmental

    Operating Temperature: 

    -40°F to +185°F (-40°C to +85°C)

    Vibration: 

    4.2 G’s from 20 to 500 Hz

    Shock: 

    4’ drop test

    Case: 

    Nickel plated terminals. Humidity and salt spray resistant. Potted for environmental protection

    Weight: 

    1.5 lbs (0.68 kg)

      

    Performance

    Overspeed Response Time: 

    75 ms typical

                                                                                                                 
     

    Note: Documents "F-22360" and "F-23371" are not under Woodward engineering control and are provided for historical reference only.

     

    WOODWARD ITEM NO. 

    FORMER DYN ITEM NO. 

    REPLACEMENT ITEM NO. 

    DESCRIPTION 

    PRODUCT INFO 

    DYN3-60030

    DYN3-60030

    Electronic speed switch

    Product Spec F-22360

    Manual
    F-23371

    SA-3681-ALR-2

    DYNZ-60010

    Electronic speed switch, 8-40 Vdc input, over speed latching SW2

    DYNZ-60012

    SA-3682-AN-1 and SA-3682-AN-2

    Electronic speed switch, 59-88 Vdc input, over speed non-latching SW2

    DYNZ-60013

    SA-3698-AN-1 and SA-3698-AN-2

    Electronic speed switch, 8-40 Vdc input, over speed non-latching SW2