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7.10 Connecting the power supply (only with type DBW52...3X/..E)
High electrical voltage by incorrect connection!
Danger to life, risk of injury by electric shock!
The safety valve type DBW...3X/..E must only be connected by a specialized
f
electrician or under supervision of the same.
Switch off the voltage supply before all maintenance, repair or installation works
f
and secure it against restarting.
Provide for proper, safe PE connection.
f
Overheating!
A wrongly dimensioned fuse protection may lead to overheating during operation of
the safety valve.
A fuse appropriate for the solenoid's rated current (max. 3 x I
f
DIN 41571 and/or IEC 60127) or a protective motor switch with short-circuit
protection and thermal instantaneous tripping (setting to rated current) must
be connected to each directional valve solenoid as short-circuit protection.
The shut-off threshold of this fuse has to be equal to or greater than the
possible short-circuit current of the supply voltage source. The fuse may be
accommodated in the related supply unit or must be separately connected
upstream.
Missing equipotential bonding!
Electrostatic processes, an incorrect earthing concept or missing
equipotential bonding may lead to malfunctions or uncontrolled movements at the
machine and thus cause injuries.
Provide for correct earthing and provide for proper equipotential bonding.
f
Penetrating water and humidity!
In case of use in humid or wet environments, water or humidity may penetrate
at electrical plug-in connectors or the valve electronics. This case may lead to
malfunctions at the safety valve and to unexpected movements in the hydraulic
system which may result in personal injury and damage to property.
Only use the safety valve within the intended IP protection class or lower.
f
Ensure before the assembly that all seals and caps of the plug-in connections
f
are tight and intact.
Uncontrolled disconnection and connection of plug-in connectors!
Device might be destroyed!
Before installation works, separate the device from the mains or from the
f
voltage source or de-energize it.
Do not plug in or pull the electric plug-in connector as long as the voltage supply
f
is activated.
WARNING
NOTICE
RE 25850-B/02.19, DB(W)52...3X/..E, Bosch Rexroth AG
Assembly
29/52
according to
rated
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