Enerpac ZU4T-Series - Manuel (Page 5)

5.1 Pendant Operation
Oil fl ow and motor operation are both controlled by the pendant.
See Figure 6.
1. Pendant advance button:
• Press for momentary wrench advance (Automode OFF).
• Press and hold to auto-cycle wrench between advance and
retract (Automode ON).
• Release to automatically retract wrench
(Automode ON or OFF).
2. Pendant on/off button: Toggles motor ON or OFF
Figure 6, Pendant Buttons
®
1. ADVANCE
2. ON/OFF
.
Notes:
• If motor is ON, pressing the
shroud motor on/off button will
immediately stop the motor, even
when pump is being operated by
the pendant.
• If motor is OFF, pressing the
shroud motor on/off button will
not start the motor, unless the
LCD is in Local mode.
See sections 6.3 and 6.5 M for
additional information.
5.2 User-Adjustable Relief Valve
The pump provides two methods of limiting the advance
(A-port) pressure to the wrench:
A) Automode (See Section 5.3)
B) The user-adjustable relief valve
(Refer to the following paragraphs of this section)
The user-adjustable relief valve limits the maximum advance
pressure by opening the relief valve to redirect the pump's oil
fl ow to the reservoir at the user-set pressure value.
WARNING: Make the following adjustments BEFORE
putting torque wrench on nut or bolt head. The pump
relief valve setting must not be above the pressure
needed to provide the required torque for your application.
Exceeding required torque will cause equipment damage and
may lead to serious personal injury.
Adjust the relief valve pressure setting as described in the following
procedure. See Figure 7.
1. Loosen the relief valve locking nut.
2. Rotate relief valve handle counter-clockwise as required, until
there is little or no resistance when turning. When this occurs,
the valve is at its lowest setting.
Note: Relief valve handle will rotate only about two-thirds of a full
turn. When rotation stops, pull up on handle to disengage. Then,
reposition and re-engage handle to allow additional adjustment
(as required).
3. Disconnect hydraulic hoses from couplers on valve.
WARNING: On (-Q) pumps, ensure all couplers have
the protective caps fully installed before starting
pump.
4. Connect power to pump. Using the LCD screen and keypad,
verify that Automode is OFF or that the “Hi Press” value is
set to a minimum of 100 psi [7 bar] higher than the desired
relief valve setting (See sections 6.5 D and 6.5 F for additional
information).
Increase
Locking Nut
Pull up to
disengage.
Decrease
Figure 7, User-Adjustable Relief Valve
5. Press the pendant on/off button. The motor will start.
6. Press and hold the pendant advance button. Pressure will
begin building in the advance (A-Port) circuit.
7. While continuing to hold down the pendant advance button,
SLOWLY rotate relief valve handle clockwise, until the pressure
shown on the LCD increases to the desired setting.
8. Release the pendant advance button to allow the system
pressure to return to the B-port retract setting. The motor will
continue to run.
9. Press and hold the pendant advance button again to recheck
the relief valve pressure setting. Verify that the desired
pressure is indicated on the LCD screen.
Note: If readjustment is necessary: To obtain an accurate setting,
always decrease the pressure to a point below the fi nal setting and
then slowly increase the pressure until the fi nal setting is reached.
10. After the desired pressure setting has been obtained, tighten
the relief valve locking nut.
5.3 Automode Auto-Cycle Operation
(Pressure or Torque Control)
The Automode feature automatically cycles the wrench from
advance to retract operation when the user-adjustable maximum
advance pressure or torque value has been achieved.
Choosing a unit of pressure (PSI, BAR or MPa) on the LCD
keypad and turning Automode ON places the microcontroller in
pressure control mode. In this mode, the user sets the maximum
advance pressure that corresponds to the desired torque value
for the wrench being used.
Choosing a unit of torque (Ft-lb or Nm) and turning Automode ON
places the microcontroller in torque control mode. In this mode,
the user selects from a list of Enerpac torque wrench models
that are programmed into the microcontroller. The maximum
allowable advance torque for the selected wrench model will
appear on the LCD. If desired, this default torque value can be
adjusted lower by the user.
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