Part to service
Action
Impeller/propeller
Check the general status of the impeller/propeller and wear ring. Change if
necessary.
Zinc anodes
Check their condition. Replace if necessary.
Screw joints
Check all externally accessible screw joints and tighten if necessary to 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 impeller/propeller rotation direction. See
(page
77).
Voltage and
amperage
Check the running values.
Electrical cabinets/
panels
Check that they are clean and dry.
Connection to power Check the cable connections. Tighten if necessary.
Overload and other
protections
Check settings
Level regulators
Check condition and function.
After any service involving the power connections, you must check the rotation before operating the
pump. See
(page 77).
Check the junction box insulation, up to 1.1 kV drives
1. Check that the resistance between the earth (ground) and phase lead is more than 5 megohms.
Use a 1000 V DC megger.
The resistance should preferably be more than 50 MΩ.
2. Keep a record of the results.
Check the junction box insulation, 1.2-6.6 kV drives
1. Check that the resistance value is a minimum of 5 megohms/kV at a temperature of 25ºC (77ºF).
Use a 1000 V DC megger. Recommended test voltage: 500 V DC, max. 1000 V DC.
The resistance should preferably be more than 300 megohms.
The resistance value is related to the motor voltage. For example, with a 6 kV motor, the resistance
between earth (ground) and phase lead should be more than 30 megohms.
2. Keep a record of the results.
Check the temperature sensors
If the pump is connected to the MAS monitoring system, then it is recommended that the sensors be
checked in the MAS unit. Otherwise, use a multimeter.
The different types of temperature sensors are:
• Thermal switches
• PTC-thermistors
• Pt100
NOTICE: Do not use a megger or other device applying a higher voltage than 2.5 V.
1. Disconnect the sensor wires.
Maintenance
84
C3300/6x5, C/R3231, C3240, C3306, C3312, C3351, C3356, C3400, C3501, C3531, C3602, C3800 Installation,
Operation and Maintenance Manual