Enerpac ZU4T-Series - Manuel (Page 6)

Depressing and holding the pendant advance button starts auto-
cycle operation. The wrench will begin auto-cycling between
advance and retract, applying the user-determined torque to the
bolt. Cycling will continue for as long as the pendant advance
button remains pressed.
The retract pressure setting is factory-preset and is not user
adjustable. When retract pressure reaches approximately 2000
psi [138 bar], the pump automatically changes wrench operation
from retract back to advance. The pump microcontroller performs
this operation by shifting the electric solenoid valve to redirect
the pump’s oil fl ow between ports.
To operate the pump using Automode:
1. Be sure Automode is ON. Set the desired maximum advance
pressure or torque value. Refer to sections 6.1 through 6.5
for detailed LCD operation instructions.
2. Start pump motor by pressing the pendant on/off button.
3. Press and hold the pendant advance button to start auto-
cycle operation.
4. If the torque wrench does not auto-cycle or does so
erratically, increase the user-adjustable relief valve setting
to a minimum pressure value of 100 psi [7 bar] higher than
the desired auto-cycle value. See Section 5.2 for additional
details.
Note: Maximum advance (A-port) pressure is limited by the
relief valve setting. If the relief valve is set lower than the LCD
pressure setting (or set lower than the pressure setting that
corresponds to the selected torque value), the desired torque
will not be obtained.
Note: Maximum retract pressure, also known as B-port bypass,
is factory set at approximately 2500 - 2800 psi [173 - 193 bar]
and is not user-adjustable.
6.0 LCD ELECTRONIC CONTROLS
6.1 LCD Function Overview
Text Display
Numeric
Display
SET 00000000
0000.0
PSI MPa
BAR
HOURS CYCLES
LOW MOTOR
VOLTAGE OVERLOAD
Nm
Ft-lb
The LCD control panel serves as an interface between the
operator and the pump. By using the LCD control panel's four-
button switches, and the additional button switches located on
the pendant, all functions and settings described in sections 6.3
through 6.5 of this document can be activated.
In the event of an abnormal condition, the LCD also displays
fault codes and warning alerts as described in sections 6.6 and
6.7.
CAUTION: Make sure that the plastic overlay that
protects the LCD screen and the button switches is
not broken or otherwise damaged. Never punch the
button switches with a sharp or pointed instrument, use fi ngertips
only. Clean the overlay regularly with a damp cloth. Never use
aggressive or abrasive detergents.
6.2 Boot Sequence
When the pump is connected to electrical power, the LCD screen
will show: “FIRMWARE 7.x” for 1 second, then “Model 4” (-E
pumps) or “Model 7” (-Q pumps) for 0.5 seconds. Following these
messages, “Motor UN”, “Motor 1P” or “Motor 3P” will appear
for 0.5 seconds. This information may be useful if the pump ever
requires servicing or repairs. Additional information may appear,
depending on pump model and installed accessories.
The boot sequence is successfully completed when the text
display on the LCD screen shows “READY” (sequence takes
approximately 3 seconds). The current system pressure or
corresponding torque value (typically “0” if motor is not running)
will also appear on the numeric display.
6.3 LCD Operation Buttons
The LCD control panel is equipped with four button switches:
On/Off / Menu / Down Arrow / Up Arrow
• Pressing the MOTOR on/off button shuts-off the motor during
normal operation. The motor OFF function is available on this
button even if the pump is being operated by the pendant.
However, the MOTOR on/off button will not turn the motor
ON except if the LCD is in Local mode (See Section 6.5 M).
• Pressing the MENU button enables the operator to step from
normal operational mode into a series of menus. Repeated
pressing allows the operator to step through all available
menus. Pressing the Menu button also saves any changes
made. To return to the normal operational mode, press and
hold the Menu button for three seconds or do not push any
button for 60 seconds.
• The Down Arrow and Up Arrow buttons serve two purposes.
For most LCD menus, the Down Arrow and Up Arrow buttons
are used to step through the menu options. Also, when the
pump is placed in Local mode, pressing the Up Arrow button
switches the valve solenoid on and off (the pendant is non-
operational in Local mode).
6.4 LCD Menu Overview
The LCD contains the following available menus:
• Normal Operation – Default start-up screen. Appears
immediately after power is connected and microcontroller
has booted.
• Units – Sets the pressure units to PSI / BAR / MPa, (pressure
control) or Ft-lb / Nm (torque control). PSI is the default
setting.
• Torque Wrench Model Selection – (Available only if “Ft-lb” or
“Nm” is selected) Selects the model number of the Enerpac
torque wrench to be used. Choose from SQD and HXD
models (-E pumps) or S and W models (-Q pumps).
• Automode – Switches the Automode function ON or OFF.
• Torque Value Selection – (Available only when Automode
is ON and if “Ft-lb” or “Nm” is selected) Select the desired
torque value at which pump auto-cycle operation will occur.
Maximum allowable torque will vary, depending on wrench
model selected.
6