Installation And Operation Of The 150-7700 Tachometer/Speed Switch{7499} Caterpillar

Engine:

3616 (S/N: 1FN; 1PD)

3618 (S/N: 2MW)

Introduction

The 150-7700 Tachometer/Speed Switch is generally used to control the opening and the closing of the bypass solenoid valve. This tachometer/speed switch is installed on the 3616 and on the 3618 for the Fast Ferry Ratings. This Special Instruction contains the information that is needed in order to install the tachometer/speed switch. This Special Instruction also shows the operation of the tachometer/speed switch. Do not perform any procedure in this Special Instruction until the entire instruction has been read and understood.

The tachometer/speed switch continuously measures the engine speed with a magnetic pickup that is connected to a ring gear on the flywheel. The tachometer/speed switch also stores four setpoint values and the information for the setup of the gauge in a nonvolatile memory. An LCD display is used to display the following information: the numeric value, the units of rpm, the state of the output switches and a bar graph. The monitored rpm is continuously compared against the four adjustable setpoints. Multiple points of overspeed shutdown are permitted with this configuration and multiple points of underspeed shutdown are also permitted. The tachometer/speed switch is also used for various purposes such as giving speed signals to the control system for the gear box.

Each setpoint can be individually configured to a high point or a low point. The setpoints can also be configured to the normally open position or the normally closed position. In addition, each setpoint can be individually adjusted for the following parameters: a value for the hysteresis, a time delay trip and a reset delay time. The operator can also control the following parameters: the programmable input pulse count, the ratios for the input that can be changed according to a scale, the rpm indicator (the indicator can be turned off for other measurements of rate), a decimal point that can be set and the ability to accept inputs from uneven patterns. Also, the LCD contains a bar graph that can be programmed for the bar mode or for a single bar between two selected points. A programmable software display filter is also incorporated in order to stabilize the readings of the variable signal from the input. The output of the current loop (4 mA to 20 mA) of the 150-7700 Tachometer/Speed Switch can also be configured through the keypad. The current loop can be configured anywhere within the range of the gauge and in the range of the reverse acting. If the output of the current loop (4 to 20 mA) is configured for reverse acting, the current output would decrease or the current output would approach the point of 4 mA. The numeric value of the rpm on the display would increase with the change of the current output.

Signal Input

The 150-7700 Tachometer/Speed Switch is designed to accept signals with a wide range of frequencies. These signals have an amplitude of 5 to 400 volts peak. The frequency of these signals is 0.5 kHz to 20 kHz. The input that is not isolated is intended for use with magnetic pickups. This input is also intended for use with various other types of DC controlled zero velocity pickups. Connect the magnetic pickup to pin "4 (+)" and to pin "5 (-)". Make this connection or connect a Hall effect pickup to the back of the 150-7700 Tachometer/Speed Switch . Refer to illustration 1.

Note: The minimum operating voltage that is required from the magnetic pickup at slow speeds is 3 V peak to peak.

Mounting

Mount the tachometer/speed switch inside the control panel or mount the tachometer/speed switch to a suitable flat surface so that the display is at a convenient height. A template for drilling is provided.

Note: Do not mount the tachometer/speed switch so that the LCD display faces the direct sunlight. The temperature range of the display is -40 °C (-40 °F) to 80 °C (175 °F).

Mount the magnetic pickup securely to a rigid bracket or a surface. Maintain an air gap of 0.1270 mm (0.005 inch) to 0.508 mm (0.020 inch) from the gear teeth to the bracket in order to obtain the lowest operational rpm. The sensed gear should not hit the pickup in the complete 360 degrees of rotation. For best results, use a gear with a pitch of 20 or use a gear with a more coarse pitch.

If a Hall effect pickup is used, mount the sensor securely to a rigid bracket or to a surface in order to maintain an air gap that does not exceed 1.016 mm (0.040 inch). The center of the face of the pickup must line up with the center of the north pole of the rotating magnet or the rotating magnets.

Wiring

General

Take care not to damage the insulation and take precautions against damage from the following reasons: vibration, abrasion and liquids in the conduits. Never run the following applications in the same conduit as the ignition wiring or other wiring with high energy such as AC power: low voltage power, current loop and the wires from the tachometer/speed switch for the output. Keep the wires at least 305 mm (12 inch) away from all high voltage wiring.

Power Wiring

Connect the wires for the input of the power to terminal "5 (-)" and terminal "6 (+)". The power requirement is 12 VDC to 36 VDC. The minus terminal "(-)" is connected to the panel ground which should be the same ground for the engine.

Magnetic Pickup

Connect the two wires that come from the magnetic pickup to the back of the gauge. Connect the wires to terminal "4" and to terminal "5". Use a cable assembly in order to make this connection.

Hall Effect Pickup

Connect the three wires from the Hall effect pickup to the back of the gauge at the following terminals: terminal "3", terminal "4" and terminal "5" with a cable assembly. Make the following connections: the cable for the pickup "B" to terminal "3" (+5 V supply) on the gauge, lead "A" to terminal "4" (the signal input that is not isolated) and lead "C" to terminal "5 (-)". In addition, place a 10,000 ohm pull up resistor across terminal "3" and terminal "4" of the gauge.

Output Switch Wiring

A fault condition will cause the output switches that are configured for the "normally open" position to turn ON. A fault condition will cause the output switches that are configured for the "normally closed" position to turn OFF. These switches will have a change of state in conjunction with the sensor common. When the switches are in the unpowered condition, the switches are in the open state. Switch "1" and switch "2" turn ON and turn OFF with the common "A". Switch "3" and switch "4" turn ON and turn OFF with the common "B". The "Form A" output of these switches has a solid state. These switches are also isolated from the power supply. The switches are rated at 200 V and 140 mA, and the switches use a unique internal overload current protection circuit. If an overload occurs, the internal circuitry limits the current to safe levels. When the overload is removed, the relay resumes the normal ON characteristics. These outputs may be connected to an annunciator system or the outputs may be connected to pilot duty relays. Refer to illustration 1.

Output Current Loop Wiring

The 150-7700 Tachometer/Speed Switch has a current loop with a range of 4 mA to 20 mA. The output of the current loop is accessible through terminal "7" and terminal "8". This output is internally limited to 20 mA. The output is protected against open circuits and closed circuits. A 250 ohm resistor can be used over the entire range of the supplied voltage from 12 VDC to 36 VDC. The maximum load resistance that can be tolerated in the loop is determined by the supply voltage. When the maximum rated resistor of 500 ohms is used with a desired output from the loop of 20 mA, the supply voltage must be between 15 VDC and 36 VDC. At a supply voltage of 12 VDC, the maximum resistor for the load is 350 ohms for a 20 mA output from the current loop. Refer to illustration 1.

Illustration 1	g00571875
Typical Wiring Schematic For The 150-7700 Tachometer/Speed Switch .

Normal Operation

When the 150-7700 Tachometer/Speed Switch is in the normal mode, the tachometer/speed switch displays a numeric value. The range of the numeric values is from 0 to 9999. These values represent the range of the rpm. The tachometer/speed switch also displays a bar graph of the sensed speed. If a setpoint value is exceeded, the associated output switch turns "ON". An annunciator turns on and the annunciator displays one of the following numbers: 1, 2, 3 and 4. These numbers indicate that a switch has tripped.

Note: The units and the bar graph can be turned OFF.

Keypad Description

The 150-7700 Tachometer/Speed Switch contains a front keypad with six keys which is used to view the setpoints. The keypad is also used to change the setpoints. The 150-7700 Tachometer/Speed Switch is also used to configure the gauge. The following keys compose the keypad: "MODE", "ENTER", "SETPTS", "ESC" and "UP" and "DOWN" arrow keys. Only one key should be pressed at a time.

MODE Key

The "MODE" key is used to enter the configuration mode. The "MODE" key is used to scroll through the menu of the setup for the gauge.

ENTER Key

The "ENTER" key is used in the setup mode in order to proceed through the configuration. The "ENTER" key is also used to accept the data. The key is used in the setpoint mode to accept the new setpoint. The key is also used to save the new setpoint. Press the "ENTER" key at the end of a configuration after a new setup has been entered. The display will read "SAVE". The display will then read "DONE", and the new data or the new configuration will be stored in the nonvolatile memory.

SETPTS Key

The "SETPTS" key is used to view the setpoint. The "SETPTS" key is also used to change the setpoint. Press the "SETPTS" key when the gauge is in the normal mode. The value and the annunciator for the "number 1" setpoint are displayed. Press the "SETPTS" key again. The value and the annunciator from setpoint "number 2" are displayed. Repeat this procedure for setpoint "number 3" and setpoint "number 4". Press the "SETPTS" key again in order to return to the normal mode.

ESC Key

The "ESC" key can be used at any time during the configuration mode or the setup mode to return to the normal mode. The modified values are not stored in the memory, when the "ESC" key is pressed in any configuration mode. The configuration then returns to the previous values and the display returns to the normal reading.

UP And DOWN Keys

The "UP" and "DOWN" keys are used to scroll through the selections in the setup mode. The "UP" key is used to increase the values of the setup and setpoints. The "DOWN" key is used to decrease the values of the setup and setpoints. When these two keys are held down, the values will rapidly increase or the values will rapidly decrease.

Default Factory Settings

The 150-7700 Tachometer/Speed Switch contains several default settings. These settings are available to the operator at any time during the life of the gauge. The gauge can be configured to any of these settings. These settings can be used as a starting point when the gauge is configured according to custom specifications. These settings may be used because all of the parameters are set to known values.

Note: The default settings are not set by Caterpillar. Therefore, these settings are not correct for use on Caterpillar equipment.

Selecting The Default Setting

Press the "MODE" key until the display shows "Unit". Press this key while the gauge is in the normal mode. Press the "ENTER" key. Use the "UP" key and the "DOWN" key to select "dFLt" and press the "ENTER" key. All of the parameters of the configuration will automatically be set to the default settings.

Note: If you do not want to change the configuration of the gauge at this time, press the "ESC" key instead of the "ENTER" key. The configuration of the gauge will not change.

Default Settings

Table 1 contains the default settings that are stored in the permanent memory. The default settings are not set by Caterpillar. Therefore, these settings are not correct for use on Caterpillar equipment.

Initial Operation

Mount the gauge and wire the gauge in accordance with the ""Mounting" " section and the ""Wiring" " section. When the gauge is activated, all the segments on the display will turn on for a check. The display will then proceed to read "0" if there is no signal input. The gauge will be set for 1 pulse per revolution from the factory. In order to change the input from the signal to a different count of the pulses per revolution, press the "MODE" key until the display shows "InPt". Then press the "ENTER" key. The display will read "PPr". The numeric value will be shown when the "ENTER" key is pressed. This value represents the pulses per revolution. Press the "ENTER" key again in order to display the previous numeric value. Press the "Up" key in order to increase the value until the desired count of the pulse is reached. Press the "Down" key in order to decrease the value until the desired count of the pulse is reached. Press the "ENTER" key in order to accept the value and save the new value. The display will read "SAVE/DONE". The gauge will now be set for the desired count of the pulse per revolution.

Note: The gauge reads the count of the pulse as the number of pulses that are viewed in one revolution. When the signal is taken from the CD ignition systems, the pulse signal must be compatible with the following types of capacitors: two-cycle capacitors, four cycle capacitors and dual storage capacitors. Refer to the ""Gauge Configuration" " section for details.

Adjusting Setpoints

There are four individually adjustable setpoints which can be set anywhere within the range of the gauge. Press the "SETPTS" key in order to view the setpoints or change the setpoints. The setpoint for the RPM and for the annunciator "1" (indicating switch 1) will be shown on the display. In order to change the value, use the "UP" and "DOWN" keys to increase or decrease the value until the desired trip point for that switch is reached. Press the "ENTER" key in order to accept the new value and save the new value. Each press of the "SETPTS" key allows the operator to view the next setpoint of the following switches: 2, 3 and 4. Follow the same procedure in order to change the setpoints. Refer to Illustration 4 for an example of values for configuration. Check the "As Shipped Drawings" for a particular engine for the correct setpoints. The "As Shipped Drawings" are contained in the Technical Manual.

Note: When the gauge is in the setpoint mode, the previous setpoints continue to be monitored. The new value is monitored only when the "ENTER" key is pressed. If no key is pressed for 20 seconds, the display will return to the normal mode. The configuration will then revert to the previous parameters.

Note: Configure the unused setpoints to "HIGH". This configuration will prevent the display of an unused annunciator during normal operation. The setpoint must be well above the maximum operating speed. Refer to the procedure in the ""Setpoint Configuration" " Section.

Gauge Configuration

The following headings are for each menu of configuration for the gauge. Press the "MODE" key in order to reach any of these headings in the normal mode. After a selection has been made and the configuration has been performed, press the "ENTER" key. The display will read "SAVE/DONE". The new data may now be saved at this time. The "ESC" key can be used at any time to abort the configuration mode. The gauge will then return to the normal reading. During the configuration, the gauge allows the first level and the setpoints to change during a 20 second period. During the configuration, the gauge also allows the first level and the setpoints to be saved during a 20 second period. The gauge allows a 1 minute period for other levels between commands to change. The gauge also allows a 1 minute period for other levels to save a new configuration. If the time passes without a new command, the gauge will automatically return to the normal mode without making any changes. The new information is saved only if the "ENTER" key is pressed and the gauge reads "SAVE/DONE". Illustration 2 details the procedure for the configuration of the gauge.

Input Configuration

The configuration for the input allows the user to configure the following parameters: the number of pulses per revolution, the decimal point, the ratio of the monitored teeth of the gear to the speed on the display and a predivide value for uneven input signals.

Note: Refer to illustration 2 in order to make a connection to the shutdown lead with uneven patterns.

Pulse Count

In order to set the count of the pulse, or the number of pulses per revolution, press the "MODE" key. The display then reads "InPt". Press the "ENTER" key. The display will then read "PPr" (pulses per revolution). Press the "ENTER" key. The previous numeric value that represents the count of the pulse will be shown. Press the "UP" key in order to increase the value until the desired count of the pulse is reached. Press the "DOWN" key in order to decrease the value until the desired count of the pulse is reached. Press the "ENTER" key in order to accept the new value and save the new value. The gauge will now be set for the desired count of pulses per revolution .

Note: The gauge will read the correct value for the number of pulses per revolution that were entered. When the signal is taken from the CD ignition systems, the pulse signal must be compatible with the following types of capacitors: two-cycle capacitors, four cycle capacitors and dual storage capacitors. Refer to the following examples.

Decimal Point

Only three decimal points are available. Only one decimal point can be on at a time. The addition of a decimal point to the display does not change the value of the scale of the displayed range. In order to set the decimal point, follow the above procedure from setting the count of the pulse. Do not press the "ENTER" key in order to finish the change. Press the "MODE" key. The display will show "d.Pnt". Use the "UP" key and the "DOWN" key in order to select the desired position of the decimal point. Press the "ENTER" key. The display will read "SCAL" (scale). If the application requires either an input ratio or a predivide, proceed to the next sections. If the application does not require these values, continue to press the "ENTER" key until the display reads "SAVE/DONE". The new configuration will be saved.

Scale

The scale or the ratio of input is used primarily to set the ratio of the gear speed in order to display the speed. This scale is used when the gear ratio is not 1 to 1. The ratio of the gear is 2 to 1, if the gear turns at a speed that is twice the speed that is registered on the display. The gear ratio is 1 to 5, if the speed on the display is five times the speed of the gear. The ratio of the input is limited to whole numbers, but the gauge may be programmed with any ratio. Change the ratio to whole numbers and enter the whole numbers. A ratio of "1.67" to "1" would be entered as a ratio of "167" to "100".

1. In order to set the ratio for the input, follow the procedure above for the count of the pulse. Follow the same procedure for the decimal point, if a decimal point is required. Press the "ENTER" key. The display will show "SCAL". Press the "ENTER" key again. The display will show "GEAR", which indicates that the next input will be the number of the gear speed. Press the "ENTER" key. Use the "UP" key or the "DOWN" key in order to adjust the value. Perform this adjustment until the desired number for the gear speed is reached.

2. Press the "ENTER" key. The display will show "DISP". This display indicates that the next input will be the number of the speed on the display. Press the "ENTER" key. Use the "UP" key and the "DOWN" key in order to adjust the value. Perform this adjustment until the desired number of the speed on the display is reached. If the application requires a predivide, proceed to the next section. If the application does not require a predivide, continue to press the "ENTER" key. Press this key until the display reads "SAVE/DONE". The new configuration will then be saved.

Predivide

The predivide input configuration is used for input signals that are uneven or that are not symmetrical. The predivide divides the input signal down to an even, repeating pattern so that the gauge can process the signal. The gauge then outputs steady display readings. The predivide may be required if the gauge reads erratically even with the filter value near the maximum (255). To set the predivide input, follow the procedure above for the count of the pulse. Continue to press the "ENTER" key until the display shows "PrEd". Press the "ENTER" key. The display will show the current numeric value of the predivide. Press the "ENTER" key. Use the "UP" key and the "DOWN" key in order to adjust the value. Perform this adjustment until the desired predivide number is reached. Set the predivide in order to provide the internal circuitry of the 150-7700 Tachometer/Speed Switch with an even, repeating pattern. Press the "ENTER" key until the display reads "SAVE/DONE". The new configuration will be saved.

Note: A setting of "1" provides no predivide of the incoming signal.

Input Configuration Examples

The number of pulses that are sent to the tachometer/speed switch during one revolution must be known. This information is used to configure the input of the tachometer/speed switch in order to indicate the correct engine RPM.

Table 2 and Table 3 will help determine this number.

Units

The unit indicator normally displays the RPM. When the indicator is in this mode, the indicator will show the RPM on the right side of the display. For other units of rate, the indicator may be turned off and the units may be labelled externally. In order to turn the indicator off or on, press the "MODE" key until the display shows "Unit". Either the RPM will appear or the "no unit" indicator will appear. Use the "UP" key or the "DOWN" key in order to select either the RPM or no indicator. Press the "ENTER" key in order to accept the change and save the change. The display will read "SAVE/DONE" and the display will return to the normal mode. The display will then show the new unit indicator.

Note: The factory default settings indicator (dFLt) is also shown. This setting can be selected under the configuration for the units.

Bar Graph

The bar graph appears across the bottom of the display. The bar graph can be configured in three different modes. Make a selection from the following modes:

• "On //////" Bar mode between two points.

• "On / / /" Single bar between two points.

• "Off" No bar graph displayed.

In order to change the bar graph mode, press the "MODE" key until the display shows "bAr". Press the "ENTER" key. Use the "UP" key and the "DOWN" key in order to select a bar graph mode. The following descriptions are of each mode:

• "On //////" This is the bar mode between the two points. Press the "ENTER" key. The display will show "brLO", which indicates the low bar value. Press the "ENTER" key. The low bar value of the current numeric RPM will be displayed. Use the "UP" key and the "DOWN" key in order to adjust the low bar value. Press the "ENTER" key. The display will read "brHI", which indicates the high bar value. Press the "ENTER" key. The high value of the current numeric RPM will be displayed. Follow the same procedure in order to adjust this value. Press the "ENTER" key. The system will return to the normal mode with the new configuration for the bar graph.

• "On / / /" This is the single bar mode between the two points. Press the "ENTER" key. The display will read "brLO", which indicates the low bar value. Press the "ENTER" key. The low bar value for the current numeric RPM will be displayed. Use the "UP" key and the "DOWN" key in order to adjust the low bar value. Press the "ENTER" key. The display will read "brHI", which indicates the high bar value. Press the "ENTER" key. The high value for the current numeric RPM will be displayed. Follow the same procedure in order to adjust this value. Press the "ENTER" key. The system will return to the normal mode with the new configuration for the bar graph.

• "Off" This indicates no bar graph. Press the "ENTER" key. The display will return to the normal mode and the bar graph will be off.

Setpoint Configuration

The setpoint configuration allows the operator to designate each switch as either a low setpoint or a high setpoint. The setpoint configuration also allows the operator to set each switch in either the normally open position or in the normally closed position. The following values are also set through the setpoint configuration: the value of the hysteresis, the trip delay and the reset delay time for each setpoint. In order to change the setpoint configuration, press the "MODE" key until the display reads "SPCF". Press the "ENTER" key. The display will show "SP1". Press the "ENTER" key in order to configure output switch "1". Press the "MODE" key in order to access the setpoint configuration for switches "2","3", and "4".

Low Or High Output Switch

Each individual switch can be set to change the state of the switch. This setting is based on either a low value or on a high value. After the "ENTER" key is pressed, the display will read "1-LO" or "1-HI". Use the "DOWN" key in order to make the selection and press the "ENTER" key.

Normally Open Or Normally Closed Output Switch

Each individual switch can be set to either the normally open position or the normally closed position for an output switch. After the "ENTER" key is pressed, the display will read "1-NO" or "1-NC". Use the "UP" key or the "DOWN" key in order to make the selection and press the "ENTER" key.

Hysteresis

The hysteresis is sometimes referred to as a deadband value. The hysteresis is a numeric value that is added to a low setpoint and this value is subtracted from a high setpoint. This calculation is performed before the switch reverts to the normal condition. The range of the hysteresis is from 0 to 9999. The hysteresis is displayed in units of RPM.

Note: The switch must be powered down in order to clear the switch. Power down the switch if the hysteresis is set for a number that is greater than the range of the RPM of the application. This value can be used to determine if a high limit was ever reached or if a low limit was ever reached. This value essentially indicates a latching type of output. After the "ENTER" key is pressed, the display will read "HySt". Use the "UP" key or the "DOWN" key in order to select a value of hysteresis. Press the "ENTER" key.

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 display for a changing input. The filtering is done in both the hardware and the software. The filter for the software is an adjustable dynamic filter. The value for the filter remains at the set value for relatively small changes of the RPM. At relatively large changes of RPM, the value of the filter decreases in proportion to the speed. The value of the filter is indicated by a number which is between 1 and 255. The "1" represents a filter with no value and the "255" represents the maximum value for a filter. In order to set the value of the filter, press the "MODE" key until the display reads "FILT". Press the "ENTER" key. The display will read the previously set value of the filter. Use the "UP" key or the "DOWN" key to increase or decrease the value of the filter. Press the "ENTER" key in order to save the new value.

Illustration 2	g00572046

Mounting Dimensions And Specifications

Illustration 3 shows the front view and the side view of the new 150-7700 Tachometer/Speed Switch . Illustration 3 also contains all the dimensions that are used to mount the new tachometer/speed switch. Table 4 contains all the necessary specifications of the new tachometer/speed switch. Illustration 4 is an example of a configuration table.

Illustration 3	g00572613
Mounting Dimensions And Specifications (1) Mounting requires clearance holes for 10-32 mounting screws. 3 holes, 120 degrees apart on a 13.2 cm (5.2 inch) diameter bolt circle.

Illustration 4	g00595774
This is an example configuration table.

Illustration 5	g00573043
Illustration 5 is a worksheet that can be used to record the configuration of the tachometer/speed switch.