5.0 RELIEF VALVE ADJUSTMENT
Z-Class pumps are equipped with one user adjustable relief valve
(see Figure 5.)
IMPORTANT:
To ensure proper pump operation:
• On pumps equipped with the optional pressure transducer, the
relief valve must be set at least 200 psi [13.7 bar] above the HI
PRESS value.
• On pumps equipped with the optional pressure switch (see
section 7.0), the relief valve must be set at least 200 psi [13.7 bar]
above the pressure switch setting.
To adjust the relief valve pressure setting:
1. Install a gauge on the pump.
2. If the pump is equipped with the optional pressure transducer,
verify AUTOMODE is off (See section 6.5C for additional
details).
3. Start the pump to allow the oil to warm.
4. Loosen the set screw locking nut.
5. Shift the control valve and build pressure in the system. Using
an Allen wrench, turn the set screw counter-clockwise to
decrease pressure and clockwise to increase pressure.
Note:
To obtain an accurate setting, decrease the pressure
to a point below the fi nal setting and then slowly increase the
pressure until it reaches the fi nal setting.
6. Tighten the locking nut when the desired pressure is set.
7. Shift the control valve to the neutral position, allowing the
system pressure to return to 0 psi.
8. Recheck the fi nal pressure setting by shifting the control valve
and pressurizing the system.
Figure 5, Relief Valve
Relief valve body
(DO NOT TURN)
Locknut
Set Screw
6.0 LCD ELECTRONIC CONTROLS
6.1 LCD Control Panel Overview
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 6.6 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 6.7 and
6.8.
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.
Text Display
Numeric
Display
SET
00000000
0000.0
PSI MPa
BAR
HOURS CYCLES
LOW MOTOR
VOLTAGE OVERLOAD
Figure 6, LCD Control Panel
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 XX” 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). On pumps equipped with the pressure
transducer option, the current system pressure (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
K).
• 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).
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