Faults - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

English
If there is no leakage but automatic operation is
still not possible, you can switch off monitoring
(see the settings for the operating parameters).
If you do so, make sure to note the max.
starts/h specified and do not exceed this value!
3. Inverter error: displayed if there is an error
caused by overvoltage, undervoltage or increased
temperature. The system restarts automatically
after three minutes.
If this error is displayed, the system has to be
checked by a qualified electrician. If this error
occurs frequently, the system may be damaged.
Short-circuit: displayed if there is a short-cir-
4.
cuit at the motor connection in the frequency
converter (motor). This can be due to faulty cable
insulation, a faulty motor or water ingress. This
error can only be reset by disconnecting the unit
from the mains.
ELECTRICAL hazard!
Electrical current can cause fatal injuries if
not handled correctly! If this error is dis-
played, the connection has to be checked and
repaired by a qualified electrician.
Overload: displayed if the current consumption
5.
exceeds the "Imax" value set in the operating pa-
rameters. This can be caused by harsher operating
conditions, frequent restarts or a faulty motor.
Before resetting the error, check the following:
• Does the set "Imax" value match the specifica-
tion on the rating plate?
• Is the system working under permissible oper-
ating conditions?
If both points have been checked and the error
continues to occur, consult Wilo customer ser-
vice.

9.2. Faults

9.2.1. Fault: The unit will not start or only after a delay
1. Electricity supply interrupted, short circuit or
earth fault in the cable or motor windings
• Have the motor and wires checked by a special-
ist and replaced if necessary
• Check the error messages on the frequency
converter
2. Fuses, the motor protection switch and/or moni-
toring devices are triggered
• Have the connections checked by an expert
and changed if necessary.
• Install and set motor protection switches and
miniature circuit breakers according to the
technical instructions, reset monitoring devices
• Check that the impeller runs freely. If necessary
clean it and ensure it runs freely again
3. Pressure difference between Pmax and Pmin is
too small
• Adjust the "Delta P" value in the operating
parameters
4. Water consumption too small
46
TROUBLESHOOTING AND POSSIBLE SOLUTIONS
• Water extraction is not detected, install a dia-
phragm expansion tank with a volume of 1-2 l
9.2.2. Fault: The unit starts, but the motor protection
switch triggers shortly after commissioning
1. The thermal trigger on the motor protection
switch is incorrectly selected and set
• Have a specialist compare the selection and
setting of the trigger with the technical specifi-
cations and correct it as necessary
2. Increased power consumption due to major volt-
age drop
• Have an electrician check the voltage on each
phase and rewire if necessary
3. Incorrect direction of rotation
• Change the direction of rotation via the menu.
4. Impeller slowed by accumulation, clogging and/or
solid matter, increased current consumption
• Switch off the unit, secure it against being
switched back on again and free the impeller or
clear the suction port
5. The fluid is too dense
• Contact the manufacturer
9.2.3. Fault: Unit is running but not pumping
1. The error "Dry running" is shown on the displayed.
• No fluid available: check inlet, open slide valve
if necessary
• Clean the supply line, slide valve, suction piece,
suction port or suction strainer
• During standstill, the pressure pipe drains;
check the pipework for leakage and the
non-return valve for contaminants; remedy
errors
2. Impeller blocked or slowed
• Switch off the unit, secure it against being
switched back on again and free the impeller
3. Defective piping
• Replace defective parts
4. Intermittent operation (cycling)
• Check switching system
9.2.4. Fault: The unit runs, but not within the specified
operating values
1. Intake blocked
• Clean the supply line, slide valve, suction piece,
suction port or suction strainer
2. Impeller blocked or slowed
• Switch off the unit, secure it against being
switched back on again and free the impeller
3. Incorrect direction of rotation
• Change the direction of rotation via the menu.
4. Air in the system
• Vent the system
5. Defective piping
• Replace defective parts
6. Inadmissible levels of gas in the fluid
• Contact the manufacturer
7. Excessive decrease in the water table during
operation
• Check the system's supply and capacity
8. "Pmax" value set too high
• Adjust the "Pmax" value according to the pump
curve or install a unit with greater output
WILO SE 05/2014 Ed.04 DIN A4