User manual EFD 900

[. . . ] Operating Guide 900 Series Dispenser 900 · 900-15 · 900-CA ® US: 800-556-3484 US: 800-556-3484 585733 · Mexico: In Mexico: 001-800-556-3484 · UK: 0800 In the UK: 0800 585733 001-800-556-3484 A NORDSON COMPANY Introduction The 900 Series fluid dispensers provide years of trouble-free, productive service. This Operating Guide will help you maximize the usefulness of your new dispenser. Please spend a few minutes to become familiar with the controls and features of your new dispenser. Review the helpful information we have included based on over 30 years of industrial dispensing experience. [. . . ] To increase the dot size, slightly increase output air pressure, or increase tip size, or both. Dot Test with Green Tapered Tip First, follow the settings illustrated on the right, and you will get dots about the size shown. Try other times and pressures to see how easy it is to get just the dot size you want. Dot Test with Blue Tapered Tip These tests show the effect of using a smaller diameter tip. Now, turn on the timer bypass switch and press the foot pedal to fill the tip. Then, turn off the timer bypass switch (yellow light out) and press the foot pedal. With the tip in contact with the test sheet, press and hold down the foot pedal while making a bead or stripe. Green Tip Settings Test Pressure Time Dot Size A B C D E F 30 psi 20 psi 10 psi 20 psi 15 psi 10 psi #7 #7 #7 #3 #3 #3 Blue Tip Settings Test Pressure Time Dot Size G H I J K 30 psi 20 psi 20 psi 15 psi 10 psi #6 #6 #3 #3 #3 Programmable Timer Each 900 series dispenser has a digital timer with programmable time ranges. The DIP switch that controls the timer has been set at the factory for a time range of 0. 01 to 1. 0 second, with the initiation set to MOMENTARY contact. If a longer time range is required, or foot pedal operation needs to be changed from momentary to maintained, choose the appropriate dip switch setting in the chart below. DIP Switch Settings 0. 01-1. 0 second O N 1234 0. 1-10 seconds O N 1234 0. 2-20 seconds O N 1234 0. 3-31 seconds O N 1234 (4) ON = Maintained pedal contact (hold foot pedal down during time cycle) (4) OFF = Momentary pedal contact (press foot pedal once) Caution: Always disconnect the power cord before removing the cover. 9 How to Use the Vacuum Control Making Timed Deposits of Watery-thin Fluids (Models 900, 900-15, 900-CA) The vacuum control allows low viscosity fluids, even water, to be consistently dispensed without dripping between cycles. The vacuum exerts a negative pressure on the fluid in the barrel and prevents dripping. For these tests, you will use the test barrel supplied with the clear fluid. While holding the barrel upright in one hand, remove the orange end cap and insert the blue LV BarrierTM . Snap the safety clip tightly closed to prevent any dripping or bubbling. With the barrel pointing downward over a container, unsnap the safety clip. White SmoothFlowTM piston for most fluids, blue LV BarrierTM for watery-thin fluids and orange flat wall piston for thick, stringy fluids. See pages 12 - 13 for a complete description of how EFD pistons work and the benefits they can bring to your operation. 11 TM Advanced Dispensing System For Thick Fluids Air Pressure ON Air Pressure OFF If you dispense thick fluids, several problems may occur. First, the repetitive air cycles can bore tunnels through non-leveling fluids, causing spitting and inconsistent deposits. Second, thick fluids contain trapped air that leads to drooling and oozing. That's because the white pistons prevent tunneling by providing a barrier to the pulsed-air cycles, and prevent oozing by responding to the pressure of trapped air with a slight suck-back movement after the dispense cycle. However, if you are applying RTV silicone and find that the piston bounces and causes stringing, switch to the orange, flat wall piston. As you load the fluid in, air is trapped in the bottom and throughout the fluid. [. . . ] Caution: If you dispense watery-thin fluids and choose not to use SmoothFlowTM pistons ­ do not increase vacuum pressure rapidly and do not tip the barrel. Vacuum may pull liquid into the air hose; or when tipped, liquid may flow back into the dispenser. This procedure ensures maximum cleanliness, prevents contamination and provides proper safety. For most fluids, optimum fill is a maximum 2/3 of the barrel capacity. [. . . ]