Circuit Breaker; Pump Operation - Enerpac ZU4 Classic Manual Del Usuario

5.0 OPERATION
5.1 Pump On-Off Switch (See Figure 7)
On-Off Switch positions:
1. ON - Pump controlled by pendant. Pump starts when pendant
"ON/ADV" button is pressed.
2. OFF - Pendant disabled. Pump will not start when pendant
"ON/ADV" button is pressed.
Circuit Breaker: If tripped, press button to reset.
Pump On-Off
Switch
ON
OFF
Figure 7, Pump Control Panel
5.2 Pendant Operation (See Figure 8)
1. Pendant "ON/ADV" Button:
• Button pressed - Motor turns ON. Wrench ADVANCES for
as long as button is held down.
• Button released - Wrench RETRACTS. Motor continues
running for up to 20 seconds.
2. Pendant "OFF" Button:
• Button pressed - Motor turns OFF immediately.
Note: Immediate motor shutoff will occur if the pump on-off switch
is moved to OFF while the pump is running.
Pendant ON/ADV Button
ON/ADV
OFF
Pendant OFF Button
Figure 8, Pendant Buttons

5.3 Pump Operation

IMPORTANT: When possible, a single user should operate the
torque wrench and pump. This can prevent accidental activation
of the pump while the operator is positioning the wrench.
1.
2.
3.
4.

CIRCUIT BREAKER

avoid injury or equipment damage before starting motor.
Press to Reset
5.
6.
7.
Note: If the "ON/ADV" button is not pushed within any continuous
20 second period, the pump's built in timer will automatically
shut off the motor.
5.4 Relieving Pressure
To relieve hydraulic pressure on the wrench and hoses:
• Press and hold the "OFF" button. See Figure 9.
• While continuing to hold down the "OFF" button, press
and release the "ON/ADV" button three or more times, until
the pressure gauge reads 0 psi/bar. The hoses can now be
removed.
4
Check all system fi ttings and connections to be sure they are
tight and leak free.
Check oil level in reservoir and add oil if necessary. (see
section 4.4)
Make sure the shipping plug has been removed and the
breather cap is installed. (see section 4.1)
Connect unit to power. Move the pump on-off switch to ON.
See Figure 7.
WARNING: In the following step, the pump motor will
start and the valve will shift automatically, retracting the
torque wrench. Verify torque wrench is positioned to
To start the pump, press the "ON/ADV" button on the
pendant. See Figure 8. The motor will start automatically,
and the wrench will begin to advance. The wrench will
continue advancing for as long as the button is held down.
Release the "ON/ADV" button to retract the wrench. After
button is released, the gauge will show the pressure in the
retract circuit (B-port bypass), approximately 2500 - 2800 psi
[173-193 bar].
Press the "OFF" button to stop the motor.
1. Press and
HOLD the
OFF button.
ON/ADV
Figure 9, Relieving Pressure
OFF
2. Press the
ON/ADV button
three or more
times, until
pressure gauge
indicates
0 psi/bar.