24
7. The CU 301 indi-
cates "Overvoltage"
or "Undervoltage".
a) The supply voltage is
unstable or outside
the voltage range
specified for the in-
stalled motor type.
Check - possibly over a period of time - that the supply
voltage is according to the values below.
• Motor type 0.5 hp = 198-315 V
• Motor type 0.75 hp = 198-315 V
• Motor type 1.0 hp = 207-315 V
• Motor type 1.5 hp = 207-315 V.
Voltage range for 100-115 V motors:
• Motor type 0.5 hp = 90-180 V.
Note: As the voltage is detected at the motor, allow for
the voltage drop in the pump cable.
8. The CU 301 indi-
cates "Dry running".
If the power consumption is lower than the dry-running stop setting and the motor
speed is within 1,000 rpm of programmed maximum speed, for an accumulated
period of 5 seconds, the pump will be stopped.
a) The pump perfor-
mance is too high for
the well yield.
Replace the pump with a smaller pump or reduce the
pump performance, by lowering maximum speed, or re-
ducing set pressure.
b) The well screen is
blocked.
Check the well capacity and restore water supply to the
well.
c) The dry-running stop
setting is incorrect.
Check and correct the setting, see section 5.3.5 Dry-
running stop.
9. The CU 301 indi-
cates "Speed reduc-
tion" and
"Undervoltage".
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
maintain 3,000 min
-1
, the pump will be stopped.
a) The supply voltage 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 cable is too
great.
Replace the pump cable with lower gauge wires.
10. The CU 301 indi-
cates "Speed reduc-
tion" 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 installed mo-
tor.
Replace pump or motor.
11. The CU 301 indi-
cates "Overtempera-
ture".
The temperature sensor in the motor is sensing a temperature above the values
stated in 8. Technical data, factory settings.
a) Insufficient cooling of
the motor.
Restore correct cooling of the motor. The flow velocity
past the motor should be at least 0.5 ft/s.
12. The CU 301 indi-
cates "Overload".
a) The pump is worn or
blocked.
The pump must be serviced.
b) The pump is too large
for the installed mo-
tor.
Replace pump or motor.
(continued on the following page)
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