Troubleshooting - Xylem LOWARA Sekamatik 12MK7 Installation, Operation And Maintenance Manual

8. Troubleshooting

The following points must be taken into account to avoid personal and material damage
when troubleshooting machine failures:

Correct a failure only if you have qualified staff, i.e. the individual work must be carried out by
trained specialist personnel, e.g. electrical work must be carried out by a qualified electrician.

Always prevent the machine from unintentional restart by disconnection it from the power supply.
Take appropriate precautionary measures.

Ensure the safety shut-down of the machinery by a second person at all times.

Safeguard mobile machinery parts to prevent injuries.

Unauthorized changes on the machinery are at own risk and discharge the manufacturer from any
liability!
The machine does not start
Cause
Interruption of the power supply, short circuit/short-
circuit to earth in the conduit and/or motor winding
Trip fuses, circuit breakers and/or monitoring
devices
The machinery starts, the circuit breaker is released, but is off shortly after start-up
Cause
The thermal trigger on the circuit breaker is set
incorrectly
Increased power input due to larger voltage drop
Impeller/propeller slowed down due to adhesions,
obstructions and/or solids, increased power input
The medium is too thick
The machinery runs, but does not convey
Cause
There is no pumped medium
Inlet obstructed
Impeller/propeller blocked/slowed down
Defective tube/pipe
The machinery is running, the indicated operating values are not met
Cause
Inlet obstructed
Gate valve in the pressure pipe closed
Impeller/propeller blocked/slowed down
Air in the system
The machinery conveys against too high pressure
Wear and tear
Defective tube/pipe
Inadmissible content of gas in the pumped medium
Dual phase operation
Too strong drawdown in operation mode
18
Remedy
Specialist to check conduit and motor and replace, if
appropriate
Connections to be checked by a specialist and changed, if
appropriate. Fit/set up circuit breaker and fuses according
to the technical instructions, reset monitoring devices.
Check impeller/propeller for smooth operation and
clean/restore to operability, if appropriate
Remedy
Specialist to compare the setting of the trigger with the
technical instructions and to correct if appropriate
Specialist to check the voltage values of the individual
phases and change the connection, if appropriate
Switch off machinery, secure against restart, restore to
operability of the impeller/propeller/clean suction branch
Contact the manufacturer
Remedy
Open inlet for container/gate valve
Clean inlet, gate valve, suction piece, suction
branch/suction filter
Switch off machinery, secure against restart, restore
operability of impeller/propeller
Replace defective parts
Remedy
Clean inlet, gate valve, suction piece, suction
branch/suction filter
Open gate valve completely
Switch off machinery, secure against restart, restore
operability of impeller/propeller
Check pipes, pressure mantle and/or part of pump, de-
aerate, if appropriate
Check the gate valve in the pressure pipe, open
completely if appropriate
Replace worn parts
Replace defective parts
Contact the manufacturer
Specialist to check connection and to correct, if
appropriate
Check supply and capacity of the system, check settings
and function of the level control