Wilo NL-HE Series, Инструкция по установке и эксплуатации

Страница: 38 / 44

en Troubleshooting possible causes and remedies
38 WILO USA 2021-01
10.1 Troubleshooting
Possible error types
Error type Description
1
Delivery rate too low
2
Motor overloaded
3
Pump end pressure too high
4
Bearing temperature too high
5
Pump housing leakage
6
Shaft seal leakage
7
Pump does not run smoothly or is loud
8
Pump temperature too high
Table 11: Error types
10.2 Causes and remedies
Error type:
1 2 3 4 5 6 7 8 Cause Remedy
X
Counter pressure too
high – Check system for con-
taminants
– Reset the duty point
X
X X Pump and/or piping not
completely filled – Vent pump and fill suc-
tion line
X
X X Inlet pressure too low or
negative suction head
too high – Correct the fluid level
– Minimise resistances in
the suction line
– Clean filter
– Reduce negative suc-
tion head by installing the
pump lower
X
Incorrect direction of ro-
tation – Change the motor con-
nection phases
X
Pump sucks air or the
suction line is leaky – Replace gasket
– Check suction line
X
Supply line or impeller
clogged – Remove clog
X
X Pump blocked by loose or
jammed parts – Clean pump
X
Air pockets in the piping – Change the pipe layout
or install an air vent valve
X
Speed too low
– with frequency con-
verter operation
– without frequency
converter operation
– Increase frequency in
the permissible range
– Check voltage
X
X Motor running on
2 phases – Check phases and fuses
X X Counter pressure of the
pump too low – Readjust the duty point
or adjust the impeller
X The viscosity or density
of the fluid is higher than
the design value – Check the pump di-
mensioning (consult with
the manufacturer)
X X X X X The pump is strained Correct the pump install-
ation