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 306680 Timer Illustrated Instructions

 

The 306680 Timer Module is designed to be incorporated into a Spraymation DC Timer (pattern control). It is a simple real time Delay followed by a real time ON. These controls along with fluid supply systems and fluid applicators form an industrial fluid dispensing system. These systems are integrated into new or existing larger machines that do some industrial process.

The purpose of the 306680 Timer Module is to produce an accurate length on time pulse to control the dispensing of fluid. It produces a safe low voltage control signal for the gun driver.

The 306680 will always be located in a suitable industrial metal enclosure that is grounded and requires tools, a key, or power to be removed before it can be opened. The keypad portion of the 306680 timer is outside the box so the operator can read the display and enter data via the keypad.

The assembly has two jumpers that must be set with the back cover removed. One selects the timer's range of 0.0 to 999.9 ms or 0 to 9,999 ms. The other selects the amount of debounce time is applied to the actuation circuit.

The 306680 has been designed to operate on 15VDC from a safe low voltage supply located in a gun driver or 306749 timer interface.

The Repeatability is -0/+2us. Long term stability is 100 PPM. There is no calibration adjustment.

Spraymation provides a Timer Calculation Program for its customers and potential customers. The program operates on x86 computers with Windows 95, 98 or NT. Click here for more information

The 306680 timer module is CE marked and has been fully EMI and RFI tested.

 

When the 306680 Timer has power applied it immediately displays the settings that were last used. The timer also starts with no digits selected for change, preventing accidental changing of data.

The Timer has two displays. The top display is the Delay Time. It is the time that the output signal is delayed after the actuation signal is applied and before the Applicator On Time. The bottom display is the Applicator On Time. Each input is entered in milliseconds (ms) and has a range of 0.0 to 999.9ms. These are real time settings.

Spraymation has free software for x86 type Windows based computers to calculate times based on speeds and distances. Ask your Salesperson for details.

Each display consists of 4 digits. Under each digit is a light bar that indicates which digit(s) are selected for change.

A four button keypad controls all aspects of setting the timer. The + and - buttons change the selected digit(s). Each time one of these buttons is pressed the display changes by one. The left and right arrow buttons are used to select the digit(s) for change.

When a new timer setting is required it is best to make the change one digit at a time. Depress the button with the Right Arrow once. If all of the digit selector light bars were off, then the 1000's digit of the Delay Time will have its selector light bar on after the Right Arrow is depressed once.

When the selector light bar is on under a single digit, the + and - buttons may be depressed to change the value of the digit directly above the light bar. Only this digit will change. The button must be depressed once for each count to be added or removed from the digit.

Depress the Right Arrow once to select the next digit.

Make the necessary changes to the digit.

Continue moving to the next digit and changing the display until all digits are done in both displays.

When all digits have been set correctly depress the Left Arrow key a number of times until the digit selector light bars are all off.

When all of the digit selector light bars are off the + and - buttons do not change data.

Often when doing an initial setup or minor daily adjustments the Delay Time or On Time need minor adjustments. The 306680 Timer allows quick minor adjustments.

Depress the button with the Left Arrow once. If all of the digit selector light bars were off, then the 4 digits of the Delay Time will have their selector light bars on after the Left Arrow is depressed once.

When all 4 digit selector light bars are on the display will be treated as a number and not separate digits.

When the selector light bar is on under a 4 digit display, the + and - buttons may be depressed to change the value of number. The button must be depressed once for each count to be added or removed form the displayed number.

The new value shown on the display will be used on the next actuation of the timer.

In the example shown note how the displayed Delay Time changed form 25.9ms to 26.0ms.

Depressing the Left Arrow again will select the On Time Display.

When changes have been made depress the Right Arrow button a number of times until the digit selector light bars are all off.

The time range of the Delay and On counters may be selected to be 0.0 to 999.9 ms (as shipped) or 0 to 9,999 ms by moving a jumper.

This jumper changes the time increment from 0.1 ms to 1.0 ms.

The display shows the range by having a decimal point in the short range and none in the long range.

Many times when a mechanical switch or push button are used a problem called switch bounce occurs. Switch bounce typically causes the timer to actuate more than once. The 306680 timer has circuits to overcome this, if required.

Normally the timer is set to 0ms debounce time. This gives the fastest operation form a "clean" actuation signal.

Plug in jumpers inside the timer can be moved to select 3, 6, 12, or 24ms of debounce time. If a switch bounce problem is suspected, select the lowest debounce time that corrects the problem. If 24ms does not correct the problem, it is not a switch bounce problem.

The 306680 Timer uses a Lithium battery to maintain setting when power is off. The battery is a standard "coin" battery that is mounted in a socket. The Battery is expected to last 5 to 10 years.

When the battery fails, settings will be lost when power is removed. When power is on the timer will function normally.

Accuracy is based on the quartz crystal time base. The time base has an accuracy of +/-100ppm. The maximum digital error at the end of the Delay Time or On Time will not exceed 2 us.

There is no method for Calibrating the Timer. Replacement or corrected settings are the only solution. Only in the most critical application should calibration confirmation be required. Confirmation of calibration can be made by checking the time base frequency with a digital frequency counter and observing a control waveform on an oscilloscope.

 

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