Enerpac ZU4T-Series - Manuel (Page 10)

10
6.6 F Oil Level Fault
Display: “OIL LEVEL FAULT”
OIL LEVEL
FAULT
Screen 23
Note: The LCD will display this fault only if the pump is equipped
with the optional oil / level temperature switch (available only on
2.5, 5, and 10 gallon reservoir sizes).
(See Screen 23) The Oil Level fault
occurs when the oil level drops to less
than 1.3" [34 mm] above the bottom of
the reservoir.
6.7 LCD Low Voltage Warning
Display: “LOW VOLT” and “Low Voltage”
LOW VOLT
Screen 24
LOW
VOLTAGE
(See Screen 24) A “Low Voltage”
condition is defi ned as an operating
condition when the AC line power is
at or below 80% of nominal voltage.
While running the pump under this
condition, the “Low Voltage” signal will
fl ash on the LCD and the Low Voltage
hours will be counted and stored by the
microcontroller.
The microcontroller will allow the pump to continue operating at
reduced voltage, provided that no fault conditions occur (See
Section 6.6). The Low Voltage warning will automatically clear
once the low voltage condition has been resolved.
IMPORTANT: Pump operation during a Low Voltage condition
is not recommended. Motor RPM and hydraulic fl ow will be
reduced. Excessive current draw may cause the pump's internal
circuit breaker to trip, resulting in a Motor Overload fault (See
Section 6.6 D).
7.0 MAINTENANCE
Frequently inspect all system components for leaks or damage.
Repair or replace damaged components. Electrical components,
such as the power cord, may only be repaired or replaced by a
qualifi ed electrician, adhering to all applicable local and national
codes.
WARNING: Disconnect pump from electrical power
before performing any maintenance or repairs.
7.1 Check Oil Level
Check the pump oil level prior to start-up. If oil level is low,
remove the SAE #10 plug from the cover plate and add oil as
needed (See Figures 3 and 4). Always be sure torque wrench is
fully retracted before adding oil to the reservoir.
7.2 Change Oil and Clean Reservoir
Enerpac HF oil is a crisp blue color. Frequently check oil condition
for contamination by comparing pump oil to new Enerpac oil. As
a general rule, completely drain and clean the reservoir every 250
hours, or more frequently if used in dirty environments.
Note: The following procedure requires that you remove the
pump from the reservoir. Work on a clean bench and dispose of
used oil in accordance with all applicable laws and regulations.
1. Remove the drain plug and drain all oil from the reservoir.
Clean and reinstall the drain plug.
2. Unscrew the 13 bolts holding the cover plate to the reservoir
and lift the pump unit out of the reservoir. Be careful not to
damage the fi lter screen.
3. Thoroughly clean the reservoir and reservoir magnet (if
equipped) with a suitable cleaning agent.
4. Remove the pick-up fi lter screen for cleaning. (Do not pull
on the screen or the bottom of the intake to avoid possible
damage.) Clean the screen with solvent and a soft brush.
Reinstall.
5. Reassemble the pump and reservoir, installing a new
reservoir gasket.
6. Fill the reservoir with clean Enerpac hydraulic oil. The
reservoir is full when oil level is as shown in Figure 4.
7.3 Motor Brush Replacement (ZU4 Models Only)
To prevent motor damage, the ZU4 motor brushes incorporate
an automatic motor stop when one of the brush carbons wears
to a length of 0.25" [6 mm]. Inspect both brushes.
1. Disconnect pump from electrical power.
DANGER: To avoid possible electrocution, pump must
be completely disconnected from electrical power
before brush servicing is attempted.
2. Remove both brush caps (A) by defl ecting the brush cap
latch (B) and gently prying outward. See Figure 8.
3. Remove motor brushes by turning black cap counter-
clockwise.
4. Replace both brushes and reverse procedure to
reassemble.
A
B
Figure 8, Brush Cap Removal
A. Brush Cap B. Brush Cap Latch
8.0 INSTALLATION OF ACCESSORIES
• For ZU4 heat exchanger (optional equipment) installation
instructions, refer to Enerpac instruction sheet L2752.
• For ZE4 and ZE5 heat exchanger (optional equipment)
installation instructions, refer to Enerpac instruction sheet
L2656.
• For ZE4 and ZE5 oil fi lter (optional equipment) installation
instructions, refer to Enerpac instruction sheet L2628.
• For pressure transducer replacement instructions, refer to
Enerpac instruction sheet L2627.
• For pendant replacement instructions, refer to Enerpac
instruction sheet L2625.