Xylem FLYFT P7900, Installation, Operation And Maintenance Manual

Page: 15 / 76

Table 4: Pt100 sensor
Description Measured value Fault values
The Pt100 sensor
is a resistor
changing value
almost linearly with
temperature.
Resistance:
• 100 ohm at 0ºC (32ºF)
• 107.79 ohm at room temperature
(20ºC, 68ºF)
• 138.5 ohm at 100ºC (212ºF)
For resistance data between 0–160ºC
(32–320ºF), see Pt100 resistance on
page 71.
> 200 ohm (approximate) can indicate
the following situations:
• Broken sensor
• Bad contact
• Broken lead
< 70 ohm (approximate) indicates:
• Short circuit
NOTICE:
Never connect the Pt100 transducer to a voltage higher than 2.5 V.
For information on the various configurations of contacts, thermistors and sensors that are
used to monitor stator winding temperature, see
Stator temperature monitoring methods
on
page 15.
3.4.5 Pump current and power monitoring
Pump current
Pump current is an important parameter in itself, which the MAS 801 can also use to record
running time, number of starts and other operating diagnostics. This information is
fundamental for monitoring operation, maintenance planning, and fault diagnosis.
Pump current in one phase is standard with the MAS 801.
Pump current in three phases
Pump current in three phases is also possible with the MAS 801. To track pump current in
three phases with the MAS 801, the following are needed:
• Three current transformers in the control cabinet
• The PAN 312 power analyzer
The current transformers are connected to the PAN 312. The PAN 312 transmits the data to
the CU and the PEM in the MAS 801 system.
Power monitoring: PAN 312
The optional Flygt power analyzer PAN 312 allows the following parameters to be monitored:
• Three-phase power
• Power factor
• System voltage
• Voltage imbalance
• Pump current in three phases
• Current imbalance
3.5 The MAS 711 monitoring equipment
The MAS 711 system
MAS 711 (Monitoring and Status) is a monitoring system for Flygt pumps. It monitors and
stores measurements from a number of sensors (temperature, leakage, and vibration).
These are used to:
• Protect the pump by raising an alarm when undesirable events occur.
• Track operational data.
Alarm levels can be set so that the operator is notified when an alarm event has occurred.
Depending on the alarm/event configuration, the MAS 711 system may stop the pump.
The base unit stores all measurement data on its embedded server.
3 Product Description
P7900 Installation, Operation, and Maintenance Manual 13