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Bosch Rexroth H-4WEH...XE Series Operating Instructions Manual page 29

4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated
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7.7.3 Connecting the power supply
High electrical voltage!
Danger to life, risk of injury caused by electric shock due to incorrect connection
and faulty pin assignment.
The valve may only be connected by or under the supervision of a specialized
De-energize the system before the assembly, pulling and connecting plug-in
connectors and all other installation works. Secure the electrical equipment
against restarting.
Provide for proper, safe PE connection.
Check before switch-on whether the protective earthing conductors at all
electric devices are firmly connected according to the connection diagram.
After connection, re-attach the cover so that it cannot be lost.
Explosion hazard due to lack of equipotential bonding!
Electrostatic processes, an incorrect earthing concept or a lack of equipotential
bonding may lead to an explosion. Apart from this, malfunctions or uncontrolled
movements at the machine may be caused!
Provide for correct earthing and provide for proper equipotential bonding.
The base plate or subplate on which the valve is fitted must be electrically
conductive and included in the equipotential bonding according to EN 60079-14
and IEC 60364-4-41.
Explosion hazard caused by overheating!
A wrongly dimensioned fuse protection may lead to overheating and thus cause an
A fuse which corresponds to the rated current according to DIN 41571
and EN / IEC 60127 has to be connected upstream of every valve solenoid
(max. 3 x I
). The shut-off threshold of the fuse has to match the prospective
short-circuit current of the supply source.
The prospective short-circuit current of the supply source may amount to a
maximum of 1500 A.
This fuse may only be installed outside the potentially explosive atmosphere or
must be of an explosion-proof design.
Explosion hazard caused by improper assembly!
In the terminal box of the valve solenoid and at the cable and line entry, there
are no provisions for the safe connection of shielding or armoring. The use of
connection lines with shielding or armoring may lead to accidental energization
which constitutes an explosion hazard!
Only use connection lines without shielding or armoring.
For information on the prescribed pre-fuse, refer to "Data sheet 24751-XE".
RE 24751-XE-B/04.16, H-4WEH...XE..., Bosch Rexroth AG



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