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EN
3.4 EM-U3 as a replacement of EM-U2
If EM-U3 shall be used as a replacement of
EM-U2, observe the following points:
• If the PLC controller is not adapted to the
extended scope of functions of the EM-
U3, the EM-U3 can be operated with the
scope of functions of the EM-U2 only.
Then the function of the middle position
M for pressure relief of lines A and B is
not available.
• The hydraulic connections must be mo-
dified due to the changed connection
diameters and the positions of the con-
nections on the EM-U3.
• Electrical connections must be provided
following the connection diagrams in
these instructions.
• Modify hydraulic connection lines ac-
cordingly and connect the EM-U3
hydraulically.
• Connect the EM-U3 electrically.
(see connection diagrams).
• Put superior machine into operation
again.
• Carry out the function control of the EM-
U3 as described in these instructions.
• Dispose of the EM-U2 in an environmen-
tally sound manner.
For assembly of the EM-U3 as a replace-
ment of an EM-U2 proceed as follows:
• De-pressurize and de-energize the
superior machine/system and protect it
against unauthorized connection, e.g. by
means of a padlock.
• Mark work area accordingly and keep
unauthorized persons away.
• Disconnect electrical connections of the
EM-U2 on the device.
• Disconnect hydraulic connections of the
EM-U2 on the device.
• Disassemble and remove the EM-U2.
• If applicable, prepare the mounting place
of the EM-U3, e.g. clean it.
• Provide fastening bores for assembly of
the EM-U3. Make sure not to damage
existing lines and components, when
doing so.
• Position the EM-U3 and fix it by screws.
(see connection dimensions).
3. Overview, functional description
