Grundfos CU 301 Notice D'installation Et De Fonctionnement page 22

Fault
7. CU 301 indicates
"Overvoltage" or
"Undervoltage".
8. CU 301 indicates
"Dry running".
9. CU 301 indicates
"Speed reduction"
and
"Undervoltage".
10. CU 301 indicates
"Speed reduction"
and "Overload".
11. CU 301 indicates
"Overtemperature".
22
Possible cause Remedy
a) The supply Check - possibly over a period of time - that the supply
voltage is voltage is according to the values below.
unstable or Voltage range for 200 - 240 V motors:
outside the
• Motor type 0.70 kW is equal to 198 V - 280 V
voltage range
• Motor type 1.15 kW is equal to 198 V - 280 V
specified for the
• Motor type 1.55 kW is equal to 207 V - 280 V
installed motor
• Motor type 1.85 kW is equal to 207 V - 280 V.
type.
Voltage range for 100 - 115 V motors:
• Motor type 0.70 kW is equal to 90 V - 150 V.
If the power consumption is lower than the dry-running stop setting for an
accumulated period of 5 seconds, the pump stops.
a) The pump
performance is Replace the pump with a smaller pump or reduce the pump
too high for the performance.
borehole yield.
b) The well screen Check the well capacity and restore water supply to the
is blocked. well.
c) The dry-running
Check and correct the setting. See section
stop setting is
running
incorrect.
Speed reduction is activated so as to maintain a reduced performance. When the
supply voltage falls so low that it can no longer supply the necessary current to
-1
maintain 3000 min , the pump will be stopped.
a) The supply
voltage is
unstable or
lower than the
Restore correct supply voltage.
voltage range
specified for the
installed motor
type.
b) The pump is not
of the correct Install correct pump type.
type.
c) The voltage
drop in the
Replace the pump cable.
pump cable is
too big.
Speed reduction is activated so as to maintain a reduced performance.
a) The pump is
worn or The pump must be serviced.
blocked.
b) The pump is too
large for the Replace the pump or motor.
installed motor.
The temperature sensor in the motor is sensing a temperature above the values
stated in the factory settings. See section
a) Insufficient
Restore correct cooling of the motor. The flow velocity past
cooling of the
the motor must be at least 0.15 m/s.
motor.
As the voltage is detected at the motor, allow for the
voltage drop in the pump cable.
stop.
8. Technical
5.3.7 Dry-
data.