• Analogue temperature sensor (Pt100) for support bearing temperature monitoring
•
Pump memory
3.6.1 MAS 711
With MAS 711, a base unit and a display unit are required for each pump.
Figure 4: MAS 711
1. Separate cables for signal and power
2. Base unit
3. MAS 711 display unit
MAS 711 features include the following:
• Five standard pump sensors
• Separate SUBCAB
®
cables for power and signal
• Text display is dedicated to one pump.
3.6.2 Sensors
Temperature sensors
Table 5: Thermal switch
Description Measured value Fault values
The thermal switch
is a normally
closed contact.
0-3 ohm, unless the wires are very long. An infinite value (open circuit) indicates
either high temperature or a fault (a wire
is broken or there is a bad contact in a
connector).
Table 6: PTC-thermistor
Description Measured value Fault values
The PTC-
thermistor is a
semiconductor
device.
Resistance at normal temperature:
• 50-100 ohm (150-300 ohm for three in
series).
• Above the tripping point, T
Ref
, the
resistance increases dramatically to
several kohm.
• An infinite value (open circuit)
indicates a fault (a wire is broken or
there is a bad contact in a connector).
• A value close to zero indicates a short
circuit in the wiring.
3 Product Description
18 P7030, P7035, P7040 Installation, Operation, and Maintenance Manual
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