Enerpac ZW4-5 Manual De Instrucciones página 10

6.5 DWELL MODE MENUS (Models equipped with
optional pressure transducer only)
The Dwell Mode menus are "hidden menus". They are
accessed through the UNITS menu and will appear only on
pumps equipped with the optional pressure transducer.
A. "DWELL ON-OFF" Menu
Screen 14 Screen 20
DWELL
SET
OFF
(See Screen 20.) This screen allows the operator to toggle the
pump's Dwell Mode On and Off. Dwell Mode must be activated
to allow the operator-defined PRESR A and PRESR B pressures
to be set.
To access this menu, go to the UNITS menu (See Screen 3).
Then, press and hold the Motor ON/OFF button for 7 seconds.
ENTRY CODE will appear on the LCD screen. Then, press and
hold the ON/OFF and Up-Arrow buttons simultaneously for 7
additional seconds.
Pump operation is as follows:
DWELL OFF – The motor will continue to run and the electric
valve will remain shifted until the Up or Down Arrow button on the
pendant is released (no automatic operation).
DWELL ON – the pump will automatically shut-off the motor
and de-energize the electric valve when the hydraulic pressure
reaches the operator-defined pressure limit (PRESR A or B) AND
the operator defined dwell time (DWELL A or B) has elapsed.
Important: For automatic shut-off to occur, the pendant Up or
Down Arrow button must remain depressed (held down) until the
dwell time has completely elapsed.
B. "PRESR A" Menu
Screen 21
SET
PRESR A
5000
(See Screen 21.) This screen allows the operator to set the PRESR A limit
for the pump. After pressure reaches this limit, the DWELL A function will
be activated and the motor / electric valve will remain energized for the
specified number of seconds. The default pressure value is 5000 psi [344
bar].
PSI
C. "DWELL A" Menu
Screen 22
SET
DWELL A
(See Screen 22.) This screen allows the operator to set the DWELL A
time in seconds. After the specified DWELL A time (0 to 60 seconds) has
elapsed, the pump will de-energize the motor / electric valve.
The DWELL A value is adjusted by pressing the Up-Arrow and Down-
Arrow buttons. If the DWELL A time is set to zero (0) seconds, the pump
will shut-off immediately when the PRESR A limit is reached.
D. "PRESR B" Menu
Screen 23
SET
PRESR B
5000
(See Screen 23.) This screen allows the operator to set the PRESR B limit
for the pump. After pressure reaches this value, the Dwell Mode feature
will be activated and the motor / electric valve will remain energized for
the specified number of seconds. The default value is 5000 psi [344 bar].
The message "Use A" will appear first. Choosing this selection will set
the PRESR B limit to the same value as PRESR A. If desired, PRESR B
can be adjusted to a different setting by pressing the Up or Down Arrow
buttons again.
Caution: Due to motor coast down, valve shift time, and
system oil capacitance, always set the user adjustable
relief valve 200 psi above the higher of the two pressure
values (PRESR A or PRESR B) to prevent pressure spikes. See
Section 5.5 for relief valve adjustment instructions.
Important: When the Dwell timer is activated, the pump will
continue to build pressure to the system relief valve setting. The
relief valve setting should be adjusted to the maximum fixture
clamping pressure, to avoid over-pressurizing any components.
NOTE: Maximum system pressure is mechanically limited to
approximately 5,300-5,600 PSI [366-386 bar] by an internal relief
valve located within the pump element. Setting the PRESR A or
PRESR B pressure value higher than the relief valve maximum
limit will not result in higher system pressure.
10
60
PSI