Woodward ESSE Speed Switches
Single- and dual-channel speed switches for critical speed functions
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.
• 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)
|
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)
|
Overspeed Response Time:
|
75 ms typical
|
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)
|
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)
|
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
|