CONTROL GP-GOV & DECELERATOR 7G5554 - Caterpillar

(converting rpm to Hz) number of teeth on flywheel ring gear = 150 engine (rated) rpm = 800Conversion: Hz = 150 × 800 = 120,000120,000 ÷ 60 = 2,000 Hz* Hz to rpmrpm = Hz value (shown on signal generator/counter) × 60 ÷ number of teeth on the flywheel ring gear.Example = (converting Hz to rpm)Hz value (shown on signal generator/counter) = 4000 number of teeth on flywheel ring gear = 200Conversion:rpm = 4000 × 60 = 240,000240,000 ÷ 200 = 1200 rpm 2. Release brake (9) for Hz adjustment knob (10). Turn knob (10) counterclockwise (CCW) (as seen from the top as shown) until it stops. This will ensure that the signal generator/counter is at the low end of its range.Check of rpm Settings (Set Point) for Electronic Speed Switch
1. Use 4C6534 Speed Switch Calibration Harness (1) to connect 8T5201 Signal Generator/Counter (3) to the electronic speed switch (6) that is to be checked and or calibrated.Refer to the topic entitled Using the 4C6534 Speed Switch Calibration Harness to Connect 8T5201 Signal Generator/Counter to an Electronic Speed Switch in this instruction.2. Push ON switch (12) to turn on power to signal generator/counter (3), then push HI switch (13). Approximately 7 Hz will appear on LCD display (14). If the overspeed switch activates, push reset button (15) to reset the switch. 3. Remove sealing screw (16) from the hole for the oil step switch.4. Connect a Caterpillar® Digital Multimeter (DMM) to crank termination (CRANK TERM) terminals 10 and 11 (17) on the electronic speed switch. Set the DMM at the 200 Volt DC range. When getting near the desired set point, turn the Hz adjustment slowly. This is because it is quite easy to overshoot (go past) the specified set point frequency.5. Using the Hz adjustment knob on the signal generator/counter, slowly increase the frequency until the DMM display switches to 0 Volts.Stop increasing the Hz frequency and record the reading shown on the signal generator/counter LCD display. This will be the crank termination set point in Hz.6. Turn the Hz adjustment knob to increase the the Hz reading until the oil step relay activates. Look into the hole where sealing screw (16) was removed, and watch to see when the red LED comes on.When the red LED comes on, stop turning the Hz adjustment knob and record the reading that appears on the signal generator/counter LED display. This is the oil step set point, in Hz. To reset either an oil step relay or crank termination relay, turn the Hz adjustment knob counterclockwise (CCW) far enough, so the Hz reading on the signal generator/counter LCD display is lower than the set point value required to activate them.Now push OUTPUT OFF switch, on the signal generator/counter, wait three seconds and then push the OUTPUT ON switch. This will reset the relay.7. Now turn the Hz adjustment knob further, to increase the Hz reading on the signal generator/counter LCD display, until the calculated Hz reading for overspeed set point