Troubleshooting; Fault Finding Chart - Grundfos UPS 200 Serie Instructions D'installation Et D'utilisation

6. Troubleshooting

6.1 Fault finding chart

Warning
Before removing the terminal box cover, make sure that the electrical supply has
been switched off and that it cannot be accidentally switched on.
The pumped liquid may be scalding hot and under high pressure. Before any removal
or dismantling of the pump, the system must be drained or the isolation valves on
both sides of the pump must be closed.
Fault
1. The pump does
not run.
None of the
indicator lights
are on.
2. The pump does
not run.
The green
indicator light is
on.
Three-phase
3.
pumps only:
The pump is
running.
The red and
green indicator
lights are on.
4. Noise in the
system. The
green indicator
light is on.
5. Noise in the
pump. The green
indicator light is
on.
6. Insufficient heat
in some places
in the heating
system.
10
Cause
a) One fuse in the installation
is blown.
b) External circuit breaker is
switched off.
c) Current-/voltage-operated
ground fault interrupter
has tripped.
d) The pump's internal ther-
mal overload switch has
cut out (standard module
only).
a) Rotor blocked, but the
pump hasn't been cut out
by the thermal overload
switch.
b) The speed switch module
has not been fitted.
a) The pump is running with
the wrong direction of rota-
tion.
a) Air in the system.
b) The pump flow is too high.
c) The pressure is too high.
a) Air in the pump.
b) The inlet pressure is too
low.
a) The pump performance is
too low.
Remedy
Replace the fuse.
Switch the circuit breaker on.
Repair the insulation defects and reset the
interrupter.
Check that the liquid temperature falls
within the specified range.
With external on/off changeover
contact:
The pump will restart automatically when it
has cooled to normal temperature.
With external on/off impulse contacts:
The pump can be restarted when it has
cooled to normal temperature.
Switch off the electrical supply and
clean/repair the pump.
Switch off the electrical supply at the
external circuit breaker and fit the speed
switch module into position.
Switch off the electrical supply at the
external circuit breaker and interchange
any two phases (leads) in the pump
terminal box.
Vent the system.
Reduce the pump performance.
Reduce the pump performance.
Vent the pump.
Increase the inlet pressure and/or check
the air volume in the expansion tank (if
installed).
Increase the pump performance, if
possible, or replace the pump with a pump
with higher flow.