RE 30011-B, Edition 10.2021, Bosch Rexroth AG
Mounting |
Pressure and flow control system SYDFE1 series 2X, 3X
53/96
Because it is practically almost impossible to connect all shields directly to 26a,
the shields of all relevant cables should be brought into contact with a busbar and
then the busbar connected to 26a. When selecting this connection variant, see to
it that the connected surfaces of the shields are as large as possible.
7.6.2 Voltage supply of control electronics VT 5041-3X
Control electronics VT 5041-3X must be supplied with 24 V DC voltage. If this
voltage supply cannot be provided by the machine, use a power supply unit
VT 19 085 (NE32) according to data sheet RE 29929. In this case, the +24 V of
the power supply unit is to be connected to contact 30a of the female connector,
and 0 V to contact 28a (recommended cross-section of the supply cable min.
1.5 mm²).
Recommendation:
The voltage supply for control electronics VT 5041-3X should be protected on the
machine side with a 1.6 A/slow-blowing fuse.
7.6.3 Selection, place of installation and mounting orientation of the pressure
transducer
To reduce the number of variants, only pressure rating “315 bar” is given in the
ordering code of the SYDFE1 control systems. If required, other pressure ratings
can be combined (with the correct selection of the relevant electrical interface!).
Such pressure transducers for the SYDFE1 control system must, however, be
ordered separately.
In terms of signals, the sensors have to be distinguished as follows:
• Sensors with current interface
• Sensors with voltage interface
Here, the usual signal limits are between 0...20 mA or 0...10 V, respectively.
Within these limits, there are further modifications that depend on required
options such as monitoring for cable break.
From a technical point of view, the efficiency of the pressure transducer must
be adapted to the SYDFE1 system in order that the best possible results can be
obtained with regard to accuracy, dynamics and repeatability.
The pressure transducers recommended by us are listed in the RE data sheets of
the relevant SYDFE1 system.
• Our pressure transducer model “HM20…C…“ with current interface (4...20 mA)
is provided with a 2-conductor connection and allows the fail-safe transmission
of signals – even over greater distances. Further pick-offs can be looped in
taking into account the relevant input resistances.
• Our pressure transducer model “HM20…H…“ with voltage interface (0.1...10
V) has a 3-conductor connection and an integrated DC/DC converter, which
effectively rules out disturbances on the analog signal caused by the voltage
supply.
CAUTION
! Uncontrolled increase in pressure!
Risk of injury!
▶ The pressure transducer must be wired so that it cannot be short-circuited,
because in the event of a missing pressure signal, the control electronics
can no longer detect the pressure, which causes an uncontrolled increase in
pressure.
Observe the operating instructions of the pressure transducer HM20, RE 30272-B.
Selection of the pressure
transducers
