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7.3.4.3 Pressure reduction monitoring
(single-line systems)
The pressure reduction in the lubrication line
during the relief procedure can also be moni-
tored using a pressure switch. The signal from
the pressure switch is evaluated differently
depending on the pressure relief valve used.
When 2/2 valves are used, they are closed
once the set minimum pressure is reached in
the lubrication line. This retains a minimum
pressure in the lubrication line.
When 3/2 directional control valves are used,
the signal from the pressure switch provides
notiication that the lines have been relieved. If
this is not the case, it is considered a malfunc-
tion. The operational sequence will be stopped
and a fault notiication will be generated (see
also Chapter 15)
When 3/2 valves are used, no minimum pres-
sure can be established in the lines, as the
valve either opens for pressure build-up or
closes the line while simultaneously relieving
it. This is not considered a problem on grease
lubrication systems.
7.3.4.4 Monitoring signal cables for cable
breakage and monitoring valves and pres-
sure switches
Every signal input conigured for connecting a
pressure switch to the control unit is constantly
monitored for cable breakage.
On systems with multiple lubrication zones, the
pressure switch assigned to a zone is queried
before a valve is opened. If the pressure switch
is not found, the control unit assumes a cable
has been broken. In this case, the lubrication
zone is deactivated until the pressure switch
fault is resolved.
On a system without multiple lubrication zones,
the unit is fully deactivated. A fault notiication
is generated in all cases (see Chapter 15).
The signal inputs can be linked to the outputs.
This allows indirect monitoring of whether
a valve attached to the output has actually
opened to allow lubricant through. The inputs
and outputs must be clearly assigned. A signal
input used, e.g., to operate a pressure switch
can only monitor the valve of the lubrication
zone that contains the pressure switch.
7.3.4.5 Monitoring outputs for short circuit
The control unit is capable of detecting short
circuit faults on the outputs. In such cases, the
output is switched off, which idles the cor-
responding valve, and a fault notiication is
generated.
Unaffected valves continue to operate.
7.3.4.6 Monitoring power consumption of
the pump motor
The power consumption of the pump motor
is monitored to avoid motor overload. If the
limit values are exceeded (see Technical Data,
Chapter 16), the system is switched off and
enters fault mode (see Chapter 15).
7.3.4.7 Monitoring unit temperature
The printed circuit board of the LC-CAN 5000
control unit contains a temperature sensor. If
the temperature in the unit exceeds the limit
value (see Technical Data, Chapter 16), the
system is switched off and enters fault mode
(see Chapter 15).
7. Functional description in single-line systems
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Содержание KFG
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