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Parameter Monitored
Leakage in the stator housing or
inspection chamber
Water in oil: standard drive units
only. (Not applicable for drive
units with internal closed-loop
cooling.)
Support bearing temperature
Pump memory
Pump current
Power monitoring
For more information on the stator temperature monitoring, see
monitoring methods
3.5.1 FLS: float switch sensor
The float switches are leakage sensors.
The float switches are located in the lower part of the stator housing and in the junction box.
3.5.2 Vibration sensor (VIS10)
Description
The vibration sensor located in
the junction box measures
vibrations in one direction. The
output is a 4-20 mA signal
proportional to the vibration
level.
3.5.3 Bearing temperature measurement
Pt100 sensors monitor the bearing temperatures to protect the pump from the consequences
of a bearing failure.
Main bearing
Main bearing temperature monitoring is standard in the MAS 711 and MAS 801. The Pt100
sensor is pressed by a spring against the outer ring of the ball bearing.
Support bearing
Support bearing temperature monitoring is an option in the MAS 711 and MAS 801. The
Pt100 sensor is pressed by a spring against the outer ring of the roller bearing.
Alarms
Two adjustable alarm limits can be used:
• Early warning: "B"-alarm
• Pump stop: "A"-alarm
3.5.4 Stator temperature monitoring methods
The purpose of stator winding temperature monitoring is to make the motor shut off at high
temperature. There are several monitoring methods, depending on the voltage of the motor,
and types of thermal sensors chosen.
By using an analogue sensor, two adjustable alarm limits can be used, one for warning ("B"-
alarm) and one for pump stop ("A"-alarm). The configurations which can be used for
P7900 Installation, Operation, and Maintenance Manual
Sensor
Float switch leakage sensor
(FLS)
Capacitive leakage sensor (CLS) 24
Pt100 analog temperature sensor 24
Printed circuit board for pump
memory includes a temperature
sensor.
A current transformer in the control cabinet is required.
Separate electronic instrument using three current
transformers.
on page 15.
Measured value
Current, 4-20 mA
3 Product Description
Signal Cable,
Number of
Leads Required
12
12
Stator temperature
Fault values
• >> 20 mA indicates a short circuit.
• << 4 mA indicates a fault.
• A zero value indicates a broken wire or bad
contact in a connector.
Standard or
Optional
Standard
Optional
Optional
Standard
Optional
15
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