Bosch Rexroth VT-PDFE-1X Series Operating Instructions Manual page 19

Green LED (U
Red LED (error)
p
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• Depending on the variant of the pilot valve, the socket "switch TD" can be a
digital input ("switch TD" = control signal to the valve/oil volume adjustment)
or also a digital output (feedback from valve to the control "power limitation
active") (see operating instructions of the relevant DFE system).
Between the individual measuring sockets there must not be any connections.
They might lead to short-circuits, malfunction or other defects!
5.2.5 Indicator lamps
The green LED next to switch U
)
B
that the switch is switched on. In this case, the connected pilot valve is supplied
with voltage.
Next to the measuring socket "Fehler" for the error signal, there is an LED that
shows the current state of the error message. The switching signal is issued by the
pilot valve and works according to the logic "low-active", i.e.
• the signal level 0 V
• the signal level +24 V
5.2.6 Potentiometers
Two ten-turn potentiometers are integrated in the test device for the provision of a
swivel angle command value (α
are only activated, if the switch "Sollwertvorgabe" (command value provision) is
switched to position "intern" (internal).
The adjustment range of the two potentiometers is from 0 V to ca. +12 V. The
desired command values can be exactly set. The applied voltage can be measured
at the two measuring sockets provided underneath (α
5.2.7 Jumpers
Impermissible operational states due to unplugging of jumpers!
Risk of injury and risk of damage to property due to uncontrolled movements
that result from the fact that no actual pressure value signal is sent to the pump
control.
▶ Never unplug one of the two jumpers during operation.
The jumpers serve to split the actual pressure signal that is fed to the pilot valve
via the central connection cable. The jumpers are included in the scope of delivery
of the test device.
The actual pressure value level (P
reference potential (P
the connections of the higher-level control. The signal of the pressure transducer
comes from here. The upper pair of sockets is constantly connected to the pilot
valve at the pump unit.
When the jumpers are removed, an actual pressure value signal from another
pressure transducer may be fed forward to the pilot valve.
signals that the voltage supply is available and
B
(ore more exactly <1 V) means
(or more exactly >13 V) means
) and a pressure command value (p
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CAUTION
H) is fed to the pilot valve with its own
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L). The lower pair of measuring sockets is connected with
IST
RE 29689-B/11.2019; VT-PDFE-1X..., Bosch Rexroth AG
About this product
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no error
). They
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