Putting Into Service; Principle Of Operation; Preparation For Use - Enerpac AVBOLT Manuel D'instructions

Putting Into Service

Principle of Operation

IMPORTANT - READ BOTH THE SAFETY RULES ON PAGE 3 AND 4 AND PLACING TOOL INSTRUCTION MANUAL
CAREFULLY BEFORE PUTTING INTO SERVICE
The EP units are high pressure hydraulic pumps delivering two different operating pressures for the pull and return cycle
®
of Avdel 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 18 to 20). 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.
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 17).
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.

Preparation for Use

•
Position the pump to ensure that air flow around the motor and cooling fan is unobstructed. Keep the motor and
cooling fan clean to ensure maximum cooling during operation.
• For shipping purposes, a red shipping plug (A) is installed in the breather port on the top of the reservoir. Before
using, replace the shipping plug with the black breather cap supplied. Note: The breather port is separate from
the oil fill port (B). Oil fill port (B) uses a SAE #10 plug. Refer to the illustration on page 12.
•
Check the oil level of the pump prior to start-up. If necessary add clean oil by removing plug (B) from the cover
plate. The reservoir is full when the oil level reaches the top of the sight glass.
•
Use only Enerpac
®
Enerpac warranty null and void. Hydraulic oil is available to order under the following part numbers.
® HF oil – the use of any other oil may cause the pump to malfunction and will render the
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