Xylem FLYFT P7900, Installation, Operation And Maintenance Manual

Page: 53 / 76

Part to service Action
Sensors Check the following:
1. Stator temperature sensors
2. Bearing temperature sensors
3. FLS and CLS sensors
See
Check the temperature sensors
on page 51 and
Check the leakage
detectors
on page 52.
Impeller or propeller Check the general impeller or propeller status. Change if necessary.
Check general wear ring status. Change if necessary.
Zinc anodes Check their condition. Replace if necessary.
Screw joints Check all externally accessible screw joints and tighten if necessary to the
correct torque. See torque table and Parts List.
Lifting handle Check its condition. Replace if necessary.
Painting Touch up any painting if necessary.
Rotational direction Check the impeller or propeller rotation direction. See
Check the impeller
rotation
on page 42.
Voltage and
amperage
Check the running values.
Electrical cabinets or
panels
Check that it is clean and dry.
Connection to power Check the cable connections. Tighten if necessary.
Overload protection
and other protections
Check the correct settings.
Level regulators Check condition and function.
After any service involving the power connections, check the rotation before operating the
pump. See
Check the impeller rotation
on page 42.
6.2.3 Checking insulation and sensors
It is important that the checks for motor insulation, temperature sensors and leakages
sensors are performed correctly and using appropriate tools. Parts of the unit, for example
temperature sensors or the PEM, can be damaged if a megger or other device is used to
apply a voltage higher than 2.5 V.
Use the following table to choose the appropriate procedures.
Item Section
Motor insulation, drive units or generators up to 1
kV
Check the insulation, up to 1 kV drives or
generators on page 51
Thermal contacts Check the temperature sensors on page 51
PTC thermistors
Pt100
FLS leakage detector
Check the leakage detectors on page 52
6.3 Check the insulation, up to 1 kV drives or generators
1. Check that the resistance between earth and phase lead is more than 5 MΩ.
Use a 500 VDC or 1000 VDC megger.
2. Keep a record of the results.
6.4 Check the temperature sensors
If the unit is connected to the MAS monitoring system, then it is recommended that the
sensors be checked in the MAS unit. Otherwise, use a multimeter.
6 Maintenance
P7900 Installation, Operation, and Maintenance Manual 51