KRAL DKC Series - 14 Troubleshooting; Possible faults; Troubleshooting

14 Troubleshooting
14.1 Possible faults
14 Troubleshooting
14.1 Possible faults
Faults can have different causes. The following tables list the symptoms of a fault, the possible causes
and measures for troubleshooting.
Identifica-
tion
Fault
1 No pump suction
2 Delivery rate too low
3 Pump too loud
4 Motor overload
5 Uneven delivery rate
6 Pump has seized
7 Shaft seal leaks
14.2 Troubleshooting
Fault identification Cause Remedy
1 – – – – – – Pump suction line closed
Check the shut-off devices. If required, open.
1 2 3 – 5 – – Parts soiled (filter, suction line, suction valve, strainer)
Clean parts.
1 2 3 – 5 – – Suction head too high
Reduce the level difference.
-or-
Reduce the line length.
-or-
Increase the line cross-section.
-or-
Heat up the pumped liquid.
-or-
Install a filter / strainer with a larger mesh width. Ensure that the permissible mesh width
is not exceeded.
1 – 3 – – – – Level in the intake container too low
Fill the intake container.
1 – – – – – – Soiling of the filters/strainers
Clean the filters/strainers Ä Servicing,Page39.
1 – – – – – – Too little pumped liquid in the pump
Fill the pump with pumped liquid.
1 – – – – – – Incorrect pump direction of rotation
Swop the two electrical connection phases Ä Connection,Page27.
1 – 3 4 5 – – Viscosity of the pumped liquid too high
Increase the temperature of the pumped liquid.
-or-
Decrease the speed.
– 2 – – – – – Viscosity of the pumped liquid too low
Reduce the temperature of the pumped liquid.
-or-
Increase the speed.
– 2 3 – 5 – – Airlock/gas in the pumped liquid
1. Test the pipe system for air admission, replace leaking parts.
2. Reduce the suction head.
-or-
Increase the inlet pressure.
Operating instructions
OID 02en-GB Edition 2019-11
45