GEAR-SHAFT DRIVE 8S1925 - Caterpillar

The engine speed switch is used in order to calculate the speed of the engine. The speed switch accepts a signal from an active speed sensor that is mounted on the engine. The engine speed switch determines the engine speed from the signal that is generated by the speed sensor.Inputs
The engine speed has 10 inputs. The inputs are listed in the following table:
Table 1
Number of Input     Address     Description    
0     I:1/0     "Speed signal input"    
1     I:1/1     "75% overspeed verify"    
2     I:1/2     "Overspeed reset"    
3     I:1/3     "Unused 1"    
4     I:1/4     "Unused 2"    
5     I:1/5     "Timer configuration input 1"    
6     I:1/6     "Timer configuration input 2"    
7     I:1/7     "Rated speed configuration input 1"    
8     I:1/8     "Rated speed configuration input 2"    
9     I:1/9     "Rated speed configuration input 3"    "Speed signal input" - The input 0 reads the signal from the speed sensor. The speed sensor is mounted near the flywheel of the engine. The input requires a minimum value of a 9 volt peak pulse (4.5 volt true RMS) from each tooth of the flywheel and a 0 VDC signal from each gap between teeth. The signal is generated by the gap between the teeth of the flywheel. The inputs are needed in order to accurately read the speed of the engine. This input can read a square wave signal up to 6600 Hz. The following alarms are based on pulse counts that are provided by the input of the engine speed sensor:overspeed alarm, crank terminate speed and oil step."75% verify" - When the "75% verify" input is wired to +24 VDC, the function becomes active. The "75% verify" input is active as voltage is seen on input 1. While the input is active, the overspeed setpoint for the engine will be 75% of the normal setpoint. The feature is used for testing only. If the input 1 is active and the engine has not reached the 75% overspeed, output 4 will flash. The output for engine overspeed is ON when the engine reaches the 75% overspeed. Output 4 is solid."Reset" - When input 2 is wired to +24 VDC and the engine speed has reached 0 RPM, the output for engine overspeed will reset. If the overspeed was triggered by the "75% verify" input, the reset will clear output 4.
Table 2
Time delay     Input 6     Input 5    
9 seconds     inactive     inactive    
15 seconds     inactive     active    
18 seconds     active     inactive    An "active" input is tied to +24 VDC.An "inactive" input is floating."Timer configuration" - Input 5 and input 6 are used in order to configure the timer for speed switch crank terminate. Refer to table 2 for the settings for the timer. The jumpers are used in order to set the amount