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6.8 Indicator elements and signal outputs
6.8.1
LED indicators and display
The lubrication unit LU 2 has three LED indicators. The indicators are placed around
the drive and visible from all sides. System status and errors are displayed via these
LED indicators. All three LED indicators have an identical function.
The system states and errors are also shown in the display.
Table 7: System states and indicators
System state
System in operation
Delivery process
Error/fault drive
Oil container LC 2 empty
Special delivery (PURGE)
Counter pressure too high
(p > 6 bar)
Low temperature (t < -20 °C)
Backup battery drive empty
6.8.2
Signal outputs
In addition, the lubrication unit LU 2 has signal outputs OK and Err.
These outputs can be evaluated by a connected controller to monitor the lubrication
unit. System state conditions and faults can be detected.
Table 8: Signal states for the outputs OK and Err
Signal output
Meaning
OK (Pin 2)
Err (Pin 4)
1
0
OK (system in operation)
0
1
Err (error occurred)
0
0
Err (error occurred),
1
1
LC (oil container empty)
6.8.3
Cable break detection
The lubrication unit monitors the signal outputs OK and Err for cable breaks.
If a cable break is detected by the signal outputs, the plug symbol disappears from
the display.
LED indicator
Flashing green in 5 s intervals
Flashing green in 1 s intervals
Flashing red
Flashing red
Flashing green in 1 s intervals
Flashing red
Flashing red
-
Detection of cable break, see page 25
3 842 358 814/2017-01, MIT: LU 2, Bosch Rexroth AG
Function
25/54
Indicator in display
- Operating mode TIME or
PULSE with appropriate
parameters
- Flashing arrow
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Er
L C
PU
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