Description
30 GA02411_002_C0 - 10/2016 - © Leybold
1.4 Built-in Accessories
Monitoring System SP-Guard
The monitoring system SP-Guard monitors vibrations, oil temperature, oil
level and exhaust pressure.
The output signals from the sensors are processed continuously by the
SP-Guard. Should the SP-Guard detect an unsafe operating condition, then
this is indicated through the error messaging output S2 to the connected
system controller. This must cause an automatic shutdown of the pump pro-
vided the signal from the SP-Guard is processed as intended. Moreover, a
message is also indicated on the display.
The SP-Guard is capable of detecting at an early stage critical operating con-
ditions, and outputs warning messages for oil temperature, gas temperature
and vibration levels of the pump to the warning messaging output S1.
The user has thus the option of introducing early enough suitable measures
like cleaning the oil cooler, for example, so as to ensure trouble-free operation
of the pump.
Implemented within the SP-Guard is a pump operating hours counter. The
number of operating hours can be indicated on the display.
Analogue inputs are available for acquiring vibration data and temperatures.
The warning and shutdown thresholds regarding these measured quantities
are configured in the factory.
The signal inputs for oil level and exhaust pressure are of the digital type. In
the case of the sensor for the exhaust pressure, the signal must be present
for 10 seconds at a pressure of over 1200 mbar.
The following outputs are available:
S1 - Warning messaging output
S2 - Error messaging output
S3 - Watchdog
S4 - Pump ON
When the shutdown thresholds are exceeded, the reason for the failure will
be indicated on the display. After having checked the likely fault causes the
SP-Guard may then be reset to the monitoring mode using the reset key.
The service technician has the option of reading the most recently saved
measured values from the internal memory of the SP-Guard. This information
will help to analyse the reasons for the specific failure.
Manually operated or solenoid gas ballast valve
The gas ballast valve is used for the purpose of avoiding condensation within
the pump.
Purge gas facility
(only for certain pump versions)
Purge gas prevents that process gas escapes via the two shaft seals to the
environment and protects components and seals against corrosion.
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