SKF KFG, Руководство по сборке

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Page 68
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7.3.3 Control unit
Explanations of the lubrication process
A differentiation is made between lubrication
cycles with and without pressure build-up
monitoring.
Lubrication cycle without pressure build-up
monitoring
On single-line systems without pressure build-
up monitoring, the lubrication cycle consists of
a pump cycle time and an interval time.
Lubrication cycle with pressure build-up
monitoring
On systems with pressure build-up monitor-
ing (see Chapter 6.3.3.3), the lubrication cycle
is divided into the pump cycle time, the pump
delay time and the interval time.
A lubrication cycle always begins with a pump
cycle.
Pump cycle time on systems without
pressure build-up monitoring
During the pump cycle time, the system
pressure required for lubrication is built up in
the lubrication line. When multiple lubrication
zones are used, the inlet valve of the relevant
lubrication zone is opened at the start of the
pump cycle time. The associated pressure
relief valve is closed.
Change-over can alternately be performed via
a 3/2 directional solenoid valve instead of the
two required 2/2 directional solenoid valves.
Once the pump cycle time is inished, the
pump is switched off and the pressure relief
valve is opened. When multiple lubrication
zones are used, the corresponding inlet valve
is closed at the same time.
The duration of the pump cycle time is a time
value conigurable in hours, minutes and
seconds. The pump cycle time for units with
W1 ill level control can also be set in pulses,
i.e., the number of agitator revolutions. Die
abzugebende Schmiermenge
The quantity of lubricant to be delivered is
thus independent of ambient conditions.
Pump cycle time and pump delay time on
systems with pressure build-up
monitoring
The pressure switch monitors whether the
required pressure buildup occurs in the lubri-
cation line during the pump cycle time. If the
pressure (switching point) set on the pressure
switch is reached, the control unit receives the
switching signal from the pressure switch and
then ends the pump cycle time. The pump
delay time is started at the same time.
The pump delay time is necessary in order to
maintain pressure in the lubrication lines until
all distributors have delivered the lubricant.
There is no interruption between the pump
cycle time and the pump delay time.
If the pressure value set on the pressure
switch is not reached during the speciied
pump cycle time, the pump is switched off and
a fault notiication is generated.
The pump delay time is a time value conigu
-
rable in hours, minutes and seconds.
7. Functional description in single-line systems
KF
G
C