Maintenance Tasks - Wilo EMU KPR Installation And Operating Instructions Manual

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Table Of Contents

Table of Contents

- Coating check and touch-up as required

- General overhaul

If it is used in highly abrasive or corrosive material, the maintenance

intervals should be reduced by 50%!

Overview of the individual maintenance intervals:

The current consumption and voltage is to be monitored periodically during all 3 phases. This

remains constant during normal operation. Slight fluctuations are a result of the composition of the

pumped fluid. The current consumption can assist in early detection and correction of damage and/

or faulty operation in the impeller/propeller, bearings and/or the motor. More extensive resulting

damage can thus be largely prevented and the risk of a total failure can be reduced.

Check the relays used are functioning fault-free. Defective devices must be immediately replaced,

because these cannot ensure safe operation of the machine. The test procedure details should be

followed closely (in the operating instructions for each relay).

To check the insulation resistance, the power supply cable must be disconnected. The resistance

can then be measured with an insulation tester (measuring voltage = 1000V DC). The following val-

ues may not be exceeded:

The insulation resistance may not be below 20mega-ohms during initial operation. For all further

measurements the value must be greater than 2mega-ohms.

Insulation resistance too low: Moisture may have penetrated the cable and/or the motor.

Do not connect the machine, consult manufacturer.

The power supply line must be examined for bubbles, cracks, scratches, chafed areas and/or

crushed sections. If damage is found, the power cable must be exchanged immediately.

The cables may only be changed by the manufacturer or an authorized/

certified service workshop. The machine may not be used again until the

damage has been adequately rectified.

When the machine is used in basins or pits, the lifting cables/cable holders (carabiners) and the

cable bracing are subject to constant wear. Regular inspections are necessary in order to prevent

the lifting cables/cable holders (carabiners) and/or cable bracing from wearing out and to prevent

the electricity cable from being damaged.

The lifting cables/cable holders (carabiners) and the cable bracing are to

be immediately replaced if any signs of wear appear.

Inspect accessories such as suspension units and hoisting gear to check whether they are secured

in a stable manner. Loose and/or defective accessories should be repaired immediately or replaced.

Monitoring devices are temperature sensors in the motor, sealing room monitors, motor protection

relays, overvoltage relays, etc.

Motor protection and overvoltage relays and other trip elements can generally be triggered manu-

ally for test purposes.

To inspect the sealing room monitor or the temperature sensor, the machine must be cooled to

ambient temperature and the electrical supply cable of the monitoring device in the switch cabinet

must be disconnected. The monitoring device is then tested with an ohmmeter. The following val-

ues should be measured:

Bi-metal sensor: Value = "0" - throughput

PTC sensor: A PTC sensor has a cold resistance of between 20 and 100ohms. For 3 sensors in series

this would result in a value of between 60 and 300ohms.

E:\shares\Baprod\BA\subtec_m\sewage\us\kpr\maintenance.fm

Maintenance

15,000 operating hours or af-

ter five years, whichever is

earlier