22
7. The CU 301 in-
dicates “Over-
voltage” or
“Undervoltage”.
a) The supply volt-
age is unstable or
outside the volt-
age range speci-
fied for the in-
stalled motor
type.
Check - possibly over a period of time - that the supply voltage is
according to the values below.
A. Motor type 0.1 to 0.63 kW / 0.3 to 0.5 hp = 190 - 320 V.
B. Motor type 0.7 to 1.05 kW / 0.5 to 0.7 hp = 190 - 320 V.
C. Motor type 1.1 to 1.73 kW / 1.0 to 1.5 hp = 210 - 320 V.
Note: As the voltage is detected at the motor, allow for the volt-
age drop in the pump cable.
8. The CU 301 in-
dicates “Dry
running”.
If the power consumption is lower than the dry-running stop setting for an accumulated
period of 5 seconds, the pump will be stopped.
a) The pump per-
formance is too
high for the bore-
hole yield.
Replace the pump with a smaller pump or reduce the pump per-
formance.
b) The well screen is
blocked.
Check the well capacity and restore water supply to the well.
c) The dry-running
stop setting is in-
correct.
Check and correct the setting, see section 5.3.5 Dry-running
stop.
9. The CU 301 in-
dicates “Speed
reduction” and
“Undervoltage”.
Speed reduction is activated so as to maintain a reduced performance. When the sup-
ply voltage falls so low that it can no longer supply the necessary current to maintain
3,000 min
-1
, the pump will be stopped.
a) The supply volt-
age is unstable or
lower than the
voltage range
specified for the
installed motor
type.
Restore correct supply voltage.
b) The pump is not
of the correct
type.
Install correct pump type.
c) The voltage drop
in the pump ca-
ble is too big.
Replace the pump cable.
10. The CU 301 in-
dicates “Speed
reduction” and
“Overload”.
Speed reduction is activated so as to maintain a reduced performance.
a) The pump is worn
or blocked.
The pump must be serviced.
b) The pump is too
large for the in-
stalled motor.
Replace pump or motor.
11. The CU 301 in-
dicates “Over-
temperature”.
The temperature sensor in the motor is sensing a temperature above the values below:
A. Motor type 0.1 to 0.63 kW / 0.3 to 0.5 hp = 65°C.
B. Motor type 0.7 to 1.05 kW / 0.5 to 0.7 hp = 75°C.
C. Motor type 1.1 to 1.73 kW / 1.0 to 1.5 hp = 85°C.
a) Insufficient cool-
ing of the motor.
Restore correct cooling of the motor. The flow velocity past the
motor should be at least 0.15 m/s.
12. The CU 301 in-
dicates “Over-
load”.
a) The pump is worn
or blocked.
The pump must be serviced.
b) The pump is too
large for the in-
stalled motor.
Replace pump or motor.
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