Fault Finding - Grundfos UPED 80-120 FZ Montageanleitung Und Bedienungsanleitung

9. Fault finding

Warning
Before removing the control box cover, make sure that the power supply has been switched
off for at least 5 minutes.
The pumped liquid may be scalding hot and under high pressure. Before any removal or
dismantling of the pump, the system must therefore be drained, or the isolating valves on
either side of the pump must be closed.
See also section 7.7 Indicator lights.
Fault
1. The pump is not
running. None of the
indicator lights are on.
2. The pump is not
running. The green
indicator light is
flashing.
3. The pump has stopped
due to a fault.
The red indicator light is
on, and the green
indicator light is off.
4. The pump is operating,
but has been stopped
due to a fault.
The red and green
indicator lights are on.
5. The pump has been set
to stop, but it has been
stopped due to a fault.
The red indicator light is
on, and the green
indicator light is flashing.
6. Noise in the system.
The green indicator light
is on.
7. Noise in the pump.
The green indicator light
is on.
Cause
a) One fuse in the installation is
blown.
b) The current-operated or
voltage-operated circuit breaker
has tripped out.
c) The pump is defective.
The pump has been stopped in one of
the following ways:
1. With the button.
2. With the R100.
3. External on/off switch in position
off.*
4. Via bus signal.*
*The fault can be temporarily corrected by selecting max. curve duty on the
pump or with the R100 as external forced-control signals will be ignored.
a) Power supply failure
(for example undervoltage).
b) Pump blocked and/or impurities in
the pump.
c) Fault in electronics.
a) The pressure and temperature
sensor is defective.
b) The pump has restarted
automatically after a temporary
fault.
a) The pressure and temperature
sensor is defective.
b) The pump has restarted
automatically after a temporary
fault.
a) Air in the system.
b) The flow is too high.
c) The pressure is too high.
a) Air in the pump.
b) The inlet pressure is too low.
Remedy
Replace the fuse.
Cut in the circuit breaker.
Repair or replace the pump.
1. Start the pump by pressing
2. Start the pump with the R100 or
by pressing .
3. Switch on the on/off switch.*
4. Start the pump via bus signal.*
Check that the power supply falls
within the specified range.
Remove the vent screw, turn the
rotor with a screwdriver inserted into
the slot in the shaft end, and/or
dismantle and clean the pump.
Contact Grundfos.
Check sensor connection.
Replace if necessary.
Reset the fault indication.
Check sensor connection.
Replace, if necessary.
Reset the fault indication.
Vent the system.
Reduce the head (setpoint), and
possibly change over to constant
pressure.
Reduce the head (setpoint), and
possibly change over to proportional
pressure.
Vent the pump.
Increase the inlet pressure, and/or
check air volume in the expansion
tank (if installed).
.
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