Putting In Service; Principal Of Operation - Stanley AV50 Instruction And Service Manual

O R I G I N A L I N S T R U C T I O N E N G L I S H

3. PUTTING IN SERVICE

3.1 PRINCIPAL OF OPERATION

IMPORTANT - READ THE SAFETY RULES ON PAGES 4 – 6 AND THE PUMP UNIT INSTRUCTION MANUAL
CAREFULLY BEFORE PUTTING INTO SERVICE.
When both hoses and control cable are connected to the Avdel®/Enerpac® hydraulic pump unit, the pull and return cycles of
the tool are controlled by depressing and releasing the trigger located in the handle.
When the switch is depressed the solenoid valve, located in the hydraulic pump unit, is energised and directs the pressurised
oil flow to the pull side of the piston in the placing tool. This also allows the oil in the return side of the placing tool to return
to the reservoir.
During the pull cycles the piston/collet assembly moves towards the rear of the tool allowing the O-ring type cushion to push
the follower and jaws forward. If a fastener pin has been inserted in the nose assembly, the jaw set will clamp onto the pintail
and assembly will commence.
For Avdelok® XT the cycle of installation will first clamp the joint to be fastened and then as the anvil continues to move
forward the collar will be swaged into the locking grooves of the pin. At the end of the swaging cycle the anvil will come up
against the joint and as movement continues the pintail will be broken off.
The trigger switch should be released immediately after pin break occurs.
If the trigger is not released, the piston will continue move towards the rear of the tool until it contacts the inner rear face.
When the piston reaches the end of the pull stroke, it uncovers flats on the rear end of a pressure relief valve rod. These flats
are designed to provide a passage for hydraulic fluid between the pull and return side of the piston. Thus allowing pressurised
fluid to be 'unloaded' or 'dumped' back to the reservoir, preventing unnecessary loading to the rear of the tool body. The
placing tool piston will be held in this position until the trigger is released.
Releasing the trigger switch will cause the solenoid to de-energise and reverse the flow of pressurised oil.
However, if during installation the pressure in the pull side achieves a preset 'High Pressure' value set at the pump. At this
point the solenoid valve will automatically de-energise and reverse the flow of pressurised oil to the return side of the placing
tool.
In either case, pressurised oil will now flow into the return side of the placing tool, with the oil in the pull side returning to the
reservoir.
The forward movement of the piston/collet assembly will eject the installed fastener from the anvil.
At the point of releasing the trigger or when the 'High Pressure' value is achieved, the solenoid valve will de-energise and
activate a preset 'Return Timer' . This controls the time that the pump motor will continue run before switching to the idle
mode. The timer can be manually set between 5 and 20 seconds to ensure that the placing tool piston always fully returns to
the forward position (refer to pump manual 07900-01030, pages 10 and 13).
When the piston returns to the fully forward position, the pressure will increase to preset low pressure value - c200bar. The
pump motor will continue to run until the Return Timer has expired. After this time period the motor will stop automatically
and valve will switch to the idle position. The solenoid valve will then automatically cycle to release pressurised oil to the
reservoir from both the pull and return side of the placing tool.
This keeps the installation tool in the forward position. No pressure will be present in the hydraulic system at this point.
The hydraulic pump unit will automatically start up on depression of the tool trigger switch.
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