PISTON 3B9730 - Caterpillar

Trip Delay Time
The trip delays and the reset time delays can be used for the following applications of timing: crank disconnect, overcrank, loading of the engine and underspeed. These times can be set from 0.25 seconds to 99.75 seconds in increments of 0.25 seconds. The output switch will trip or the switch will reset only if the reading exceeds the setpoint for the entire time period without interruption. After the "ENTER" key is pressed, the display will read "t.dLy". Press the "ENTER" key. The previously set time for the trip delay will be shown. Use the "UP" key or the "DOWN" key in order to select a time for the trip delay. Press the "ENTER" key.Reset Delay Time
The output switch will not reset until the reset time delay is continuously satisfied. After the "ENTER" key is pressed, the delay will read "r.dLy" (reset delay time). Press the "ENTER" key in order to accept the selected configuration for switch "1". The display will then read "SAVE/DONE", and the new configuration will be saved. Repeat the same procedure in order to configure setpoints "2","3", and "4".Setpoint Example
The setpoint is configured as "HIGH" if the setpoint is configured at 1000 RPM with a 2.5 second trip delay. Therefore, the reading must be above 1000 RPM for the full 2.5 seconds without interruption before the switch will trip. The reset time delay works in a similar manner. However, the addition of the hysteresis of 10 RPM changes the reset time delay. The reading must be below 990 RPM for at least 5 seconds before the switch would reset.Output Current Loop
The range of the output of the current loop is 4 mA to 20 mA. This range allows the operator to output a signal that is proportional to the RPM that is measured and displayed. In order to configure the current loop, press the "MODE" key until the display reads "LOOP". Press the "ENTER" key. The display will read "LP.LO" (low loop). Press the "ENTER" key. The value of the RPM for the previous setpoint of 4 mA will be displayed. Use the "UP" key or the "DOWN" key in order to adjust the numeric value for the setpoint of 4 mA. Press the "ENTER" key. The display will show "LP.HI". Press the "ENTER" key. The previous value of the RPM for the 20 mA point will be displayed. Again use the "UP" key or the "DOWN" key in order to adjust the desired 20 mA numeric value. Press the "ENTER" key and save the new configuration with a range of 4 mA to 20 mA. The display will then return to the normal reading.Note: The current loop with a range of 4 mA to 20 mA can be configured for reverse action. Configure the "LP.LO" or the low point with the 20 mA value. Configure the "LP.HI" or the high point with the 4 mA value.Display Filter
The filter for the display can be used in order to stabilize the reading on the