Putting Into Service; Principle Of Operation - Stanley Enerpac PRO Series Manual

3.

PUTTING INTO SERVICE

3.1

PRINCIPLE OF OPERATION

IMPORTANT
READ THE SAFETY RULES PROVIDED IN THE ENERPAC PUMP INSTRICTION MANUAL AND IN THE PLACING TOOL
INSTRUCTION MANUAL CAREFULLY BEFORE PUTTING INTO SERVICE
The PRO units are high pressure hydraulic pumps delivering two different operating pressures for the pull and return cycle of
Stanley Engineered Fastening placing tools; High pressure (c510bar) during the pull cycle and a lower pressure (c200bar)
during the return cycle.
When connected to the correct power supply and then coupled electrically and hydraulically to the placing tool, the pump will
operate when the trigger switch on the placing tool is activated.
When the trigger switch is depressed, the motor will start and the solenoid valve located in the hydraulic pump unit is
energised, directing the pressurised oil flow to the pull side of the placing tool piston. This also allows the oil in the return side
of the placing tool to flow to the reservoir. The placing tool piston will move rearwards.
Releasing the trigger switch will cause the solenoid to de-energise and direct the flow of pressurised oil into the return side of
the placing tool piston. The oil in the pull side will be directed to the reservoir simultaneously. The placing tool piston will then
return.
If the trigger is not released, the placing tool piston will continue move towards the rear of the tool until it reaches the end of
its stroke. The pressure in the pull side will then increase until a preset 'High Pressure' value is achieved (refer to pages 20 to
22). 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. See note **
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 page 19). See note**
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. See note**
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.
Note**
These operating steps are not applicable to tools 76506-02000 and 76507-02000 - please see the following:
If the trigger is not released, the placing tool piston will continue move towards the rear of the tool until it reaches the end of
its stroke. The pressure in the pull side will then increase until a preset 'Relief Valve Pressure' value is achieved (refer to pages
20 to 22). The tool and pump unit will hold in this maximum pressure state until the trigger is released.
At the point of releasing the trigger, the solenoid valve will de-energise and reverse the flow of pressurised oil to the return
side of the placing tool.
When the piston returns to the fully forward position, the pressure will increase to factory set low pressure value - c200bar.
The pump motor will continue to run until a factory set 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.
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