Xylem WTS - Manual (Page 14)

Operating instructions
WTS 102/3-en 12
Setting the Level Switch
Guide the cables of any level switches through the cable stuffing box of the switch cover 382/S
and and clamp according to the desired switching levels.
Initial Operations
Remember that when starting against closed pressure line valves the power consumed by the
pump is converted to heat and and discharged to the pumping medium. This can lead to
impermissible warming of the pumping medium after a relatively short time which can damage
the pump's inner fittings. Therefore after the pump has reached operating speed, the pressure side
valve should be opened as quickly as possible.
• Medium lubricated slide bearings must be flooded.
• Start pure water or grease lubrication.
• Check whether all safety devices are ready for operation.
• Check the switch level setting (the lowest water level must guarantee sufficient water coverage).
• Stay away from danger area containing live parts or parts under pressure.
• Check direction of rotation by switching on and off briefly. It must be the same as the directional
arrow on the bearing frame. To change the direction of rotation, see Point 4.4 „Electrical
Connection“. If the direction of rotation is correct, the flow rate will increase and running will be
quieter.
• Start drive device. With manual Y/∆-switching, note information in Point 4.4 „Starting“.
• Οpen any slide valves present in the pressure line.
• Work on the pump may only be carried out when the current has been switched off and the
movable parts are no longer turning. Switching on by unauthorized persons is to be prevented
by appropriate measures.
• In case of failure, e.g. motor does not start, fuses blow or the motor protection switch is
activated immediately, on no account should you repeat the starting procedure (danger of excess
pressure in motor due to impermissible warming). Detect cause of fault and repair.
After Switching On
• Τhe direction of rotation can also be checked after switching on. This is done by comparing the
flow rate and running noise of the pump. To change the direction of rotation, see Point 4.3. If the
direction of rotation is correct, the flow rate will increase and running will be quieter.
• Check current uptake and running of machine.
• If faults occur, see chapter 7 „Faults - Detection and Repair“.
Restarting
Basically, the same procedure should be followed as for starting up for the first time. However,
there is no need to check the direction of rotation of the pump unit.
4.6 Operation and Monitoring
Be particularly careful not to touch hot machine parts. Remember that
automatically controlled systems may switch themselves on suddenly at any time.
Suitable warning signs should be affixed.