Grundfos UPED 50-12 Montage- Und Betriebsanleitung Seite 144

Fault
None of the pumps are
running.
None of the indicator
lights are on.
The pump is not running.
The green indicator light
is flashing.
Both pumps have stopped
due to a fault.
The red indicator light is
on and the green indica-
tor light is off.
The pump is running, but
has been stopped due to
a fault.
The red and green indica-
tor lights are on.
The pump has been set to
stop, but has been
stopped due to a fault.
The red indicator light is on
and the green indicator
light is flashing.
Noise in the system.
The green indicator light
is on.
144
Cause
One fuse in the installation is blown.
The current-operated or voltage-operated
circuit breaker has tripped out.
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.
Electricity supply failure (e.g. undervolt-
age).
Missing phase (the pump runs for 2 min-
utes and then stops).
The pumps are blocked and/or impurities
in the pumps.
Fault in electronics.
The differential pressure and temperature
sensor is defective.
The master and slave pumps have been
stopped due to a fault. One or both
pumps have restarted automatically.
The master pump is or has been stopped
due to a fault.
The slave pump is or has been stopped
due to a fault.
The differential pressure and temperature
sensor is defective.
The master and slave pumps have been
stopped due to a fault.
The master pump is or has been stopped
due to a fault.
The slave pump is or has been stopped
due to a fault.
Air in the system.
The flow is too high.
The pressure is too high.
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 electricity supply falls
within the specified range.
Check fuse and connections.
Remove the inspection screw and
turn the rotor by means of a screw-
driver inserted into the slot in the
shaft end, and/or dismantle and
clean the pump.
Contact Grundfos.
Check sensor connection. Replace,
if necessary.
Reset fault indication.
Check sensor connection.
Replace, if necessary.
Reset fault indication.
Vent the system.
Reduce the head (setpoint) and pos-
sibly change over to constant pres-
sure.
Reduce the head (setpoint) and pos-
sibly change over to proportional
pressure.