PULSE-8
MASTER PULSATION
CONTROL: 4
OperatingthePULSE-8:ChangingtheFrequency:
The frequency is measured in pulses per minute (ppm) and can be set in the range 30 to
120ppm in single steps. Before the frequency can be changed, the unit must be in Access
mode. With the power on, move the MODE SELECT switch up (STAND-BY). The displays will
extinguish, but the channel indicators will continue to flash. Press and hold both the RATIO 1
and RATIO 2 buttons and, at the same time move the MODE SELECT switchto ON. The displays
will re-illuminate together with the RESET and ACCESS indicators. The unit is now in Access
mode.
Release the RATIO buttons and press the FREQ button together with either the UP or
DOWN button depending upon whether an increase or decrease in frequency is required. The
FREQUENCY display shows the frequency selected. To store the new setting, put the MODE
SELECT up (STAND-BY) position and then back to the ON position. The unit will resume pulsing
atthenew frequency.
Changingthe Ratios:
The ratio represents the percentage of the pulse length that the solenoid valve is energised. So,
for example, a ratio of 60 displayed means that the solenoid valve will be on for 60% of the
pulseduration and 40%off.Again,the unit must be in theAccess mode to makechangesto the
ratio. To change the setting for channels 1 and 3, press and hold the RATIO 1 button and, at the
same time press either the UP or DOWN button for an increase or decrease in the value.
Channels 2 and 4 are altered in the same way but by pressing the RATIO 2 button instead. The
new setting is displayed in the RATIO window. Store the new settings by switching MODE
SELECT up (STAND-BY) and then back to ON. Ratios may be changed in single steps from 50%
to75%.
TheSplit Function:
It is often desirable to have different ratios for channels 1+3 and 2+4 since the variable
pulsing spreads the load on the vacuum line.If the ratios are different, the SPLIT indicator will
illuminate as a warning. However, if it is necessary to set all channels to the sameratio, put the
unit into Access mode and examine the settings by pressing first the RATIO 1 button and then
the RATIO 2 button. Choose whichever ratio is suitable by pressing the RATIO button for the
setting NOT required together with either the UP or DOWN button until the SPLIT indicator is
extinguished.Allchannelswill nowhavethe same ratiosetting.
TheInvert Function:
To save power, some solenoid valves are designed to be normally ON, which means that they
are open and will pass a vacuum when unenergised; when power is applied to them they block
the vacuum line. The PULSE-8 can accommodate these new valves by swapping the ratio
values. So, for a conventional setting of say 60% on and 40% off, for normally on valves these
areswappedto become 60% off and 40% on but for the duration of the 60% off time the valve
SPECIFICATIONS:
InputVoltage: 220or240volts AC50Hz
OutputVoltage: 12,15, 18or 24volts selectable.
OutputCurrent: 24amps at12volts to 12amps at 24volts.
Solenoids: 48at 12voltsDC 0.5amp to 24 at24volts DC0.5amp.
Fuses: 5ampx20mm Quickblowto each channel.
Outputs: 4grouped aschannels 1+3 and 2+4.
Frequencies: 30ppmto120ppm in 90 singlesteps.
Ratios: 25selectable
50:50to 75:25normal or
50:50to 25:75inverted.
SplitPulsation: Available.
Stand-by: Operatesin 50:50ratio and frequency set by:
PriorFebruary1999: byrotary control.
Post February1999: by selectors 4 fixedfrequencies.
Memory: Functionalfor atleast 48 hours.
Defaults: Frequency:40ppm/ Ratios:60:40/ Split:OFF/ Invert:OFF
EmergencyBattery: 12 or24volt with PowerSourceSelect Switch.
willstill be passingthevacuum becauseitisnormally openoron.
To invert the ratios, move MODE SELECT up (STAND-BY), pressand hold both the UP and
DOWN buttons and switch MODE SELECT back to ON. The INVERT indicator will now illuminate.
To storethesetting, movetheMODESELECT switchup(STAND-BY)and thenbackto ON.
Reset:
If the mains power is turned off or interrupted, the data battery backup inside the unit will
retain the settings for about 48 hours. Beyond that time the data may be lost and when the
power is restored the settings may have reverted to the defaults. This situation will be shown by
the RESET indicator and the preferred settings will have to be reentered. Generally, a manual
resetis not necessary,but can be achievedbyswitchingMODE SELECTup(STAND-BY),pressing
andholding the FREQ buttonandthenswitching MODESELECTback to ON. The default settings
willbe displayedinthewindows.
EmergencyBatterySupply
If the mains supply fails, connect either a 12 or 24volt battery across the Emergency Battery
Terminals taking care that the polarities are correct. Push up (OFF) the Power Source switch on
the right hand end of the casing and the Pulse-8 will continue to operate. When mains is
restoreddisconnectthe battery andswitchthe PowerSourceto the ON position
© ATL Agricultural Technology Limited: February 2006
