Installation and operating instructions Wilo-TOP-Z 41
English
If the malfunction cannot be rectified, consult a specialist technician or the
nearest customer service centre or Wilo representative office.
Fault With the power switched on, the pump does not run.
Cause Motor protection has switched the pump off, because:
a) Switch off
because of
hydraulic over-
loading of the
pump.
b) Switch off because of
obstruction within the
pump.
c) Switch off
because of
excessive fluid
temperature.
d) Switch off
because of
excessive
ambient tem-
perature.
Remedies a) Throttle the
pump on the
pressure side to
an duty point
on the pump
curve.
b) If necessary remove
the venting screw (visi-
ble from outside) from
the pump and check the
free running of the pump
rotor by turning the
slotted shaft end, using
a screwdriver; unblock if
necessary.
Alternative:
Dismantle the motor
head and check; if nec-
essary, unblock by turn-
ing the impeller. If the
obstruction cannot be
cleared, contact cus-
tomer service.
c) Reduce the
temperature of
the fluid, see
rating plate
data.
d) Reduce the
ambient tem-
perature , e.g.
by insulating
the piping and
valves.
Display Display of the lights in the terminal box type
1 2 3
4 5 6 7
- - -
- green green green
Fault
acknowledge-
ment
Terminal box type 1/2:
Auto-reset; after the motor has cooled down, the pump restarts automatically.
Terminal box type 3/4/5/7:
It the thermal winding contact was connected to an external switchgear SK602/
SK622, this must be reset. For switchgear SK602N/SK622N the fault is auto-
matically acknowledged once the motor has cooled.
Terminal box type 6:
After the motor protection has tripped, switch off the mains voltage. Allow the
pump to cool down approx. 8 to 10 min, then switch the supply voltage on
again.
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