Protective Devices - Enerpac WU-Series Bedienungsanleitung

5.3 Pendant Operation
Models WUD-1100B/E and WUD-1101B/E
These pumps operate single-
acting cylinders in workholding
applications where a pressure
holding function is not required.
Pressing the pendant clamp
button starts the motor and
shifts the control valve.
If the pendant clamp button is
held down, the motor will stop
automatically when clamping
pressure reaches the pressure
switch setting (refer to Section
8.0).
If the pendant clamp button is
released before the pressure
switch setting is reached, the motor will stop and clamping
pressure will be released.
IMPORTANT: Models WUD-1100B/E and WUD-1101B/E do not
provide a pressure holding feature. Clamping pressure is released
whenever the motor stops.
Models WUD-1300B/E and WUD-1301B/E
These pumps operate single-
acting cylinders in workholding
applications where a pressure
holding function is required.
Pressing the pendant clamp
button starts the motor.
If the pendant clamp button is
held down, the motor will stop
automatically when clamping
pressure reaches the pressure
switch setting (refer to Section
8.0). Clamping pressure will be
maintained after motor stops.
If the pendant clamp button is
released before the pressure
switch setting is reached, the motor will stop. Partial clamping
pressure will be maintained after motor stops.
Pressing the pendant clamp release button shifts the control valve
and releases clamping pressure.
Note: All WUD pump models: If the pendant clamp button is
released before full clamping pressure is reached, a small amount
of additional cylinder movement may occur while the motor is
stopping. Such movement is normal.

6.0 PROTECTIVE DEVICES

6.1 Thermal Switch
To protect the pump from damage, an internal thermal switch
shuts off the motor when the hydraulic oil temperature reaches
150°F [65°C]. When the temperature drops to 130°F [54°C] the
switch will reset automatically.
Clamp
Button
Figure 6, Pendant,
WUD-1100B/E and
WUD-1101B/E Models
Clamp
Button
Clamp
Release
Button
Figure 7, Pendant,
WUD-1300B/E and
WUD-1301B/E Models
ON
OFF
6.2 Circuit Breaker
MOM
In the event of an electrical
overload, the pump circuit
breaker will trip.
investigating and correcting
the source of the overload,
push the circuit breaker button
to reset (see Figure 8).
WARNING: To avoid
injury and equipment
damage, do
continue pressurizing cylinders
after they reach maximum
travel or maximum operating
pressure.
7.0 RELIEF VALVE ADJUSTMENT
A user-adjustable external relief valve is located under a hex cap
on the right side of the pump (see Figure 9). It is adjustable from
approximately 5,000 psi [350 bar] down to approximately 1450
psi [100 bar].
Adjust the relief valve as described in the following steps:
1. Install a plug in the control valve outlet port.
2. Remove the hex cap covering the relief valve adjustment
screw.
3. Using an Allen wrench, turn the adjustment screw
counterclockwise one full turn.
4. Run the pump motor, watching the gauge reading for the
desired maximum pressure. Stop the pump.
5. If necessary, adjust the setting as required, until the desired
maximum pressure is attained.
Note: To obtain the most accurate setting, start at a lower
pressure and adjust up to the desired setting.
6. Check the relief valve setting by running the pump several
times. If the gauge reading is the same each time, the setting
is stable.
7. Reinstall the hex cap to cover the adjustment screw.
8. Check the pressure switch setting and readjust if necessary.
Refer to instructions in Section 8.0.
Figure 9, External Relief Valve (hex cap removed)
Note: A separate safety relief valve (located inside the pump)
is factory set to approximately 5,500 psi [380 bar] maximum
operating pressure. The safety relief valve is NOT user adjustable.
WARNING: To avoid equipment damage and personal
injury, do not exceed 5,000 psi [350 bar] maximum
working pressure. Never attempt to adjust or disable the
pump safety relief valve.
4
After
not
CIRCUIT BREAKER
Press to Reset
Figure 8, Circuit Breaker
Locknut Adjustment
Screw