21
5. The CU 301 in-
dicates “No
contact to
pump”.
a) The motor is not
an MSE 3.
If the pump has already worked satisfactorily with a CU 301 or a
CU 300, the motor can be expected to be an MSE 3.
There is no technical way of determining the motor type. The
only way is to read the nameplate engraved in the motor sleeve.
b) The pump cable
is longer than
200 metres.
Reduce the length of the pump cable.
c) Cable breakage. Switch off the mains supply to the CU 301.
Switch on the mains supply again. The pump is now connected
direct to the mains supply without interference from the CU 301.
Does the motor start?
Yes: The cable is OK. Go to point d).
No: Switch off the mains supply again. Remove cable and cable
plug from the motor and carry out megging of cable complete in-
cluding plug.
Is the cable OK?
Yes: The motor is defective. Replace the motor.
No: Replace the cable.
d) Cross communi-
cation with adja-
cent CU 301.
If another CU 301 is installed:
• Insure each unit has a unique number assigned. See section
5.3.9 Number.
• If pump cables run parallel to each other, physically separate
them by 12-14 inches or rewire using shielded cable.
e) The CU 301 com-
munication part is
defective.
Are the three CU 301 supply board LEDs in pos. 2, 3 and 4 on
and is the control indicator LED flashing? See section 4. Posi-
tion of LEDs and fuse.
Yes:
• The mains supply is OK.
• Give the system a new number.
If this does not work, the CU 301 or the motor communication
part is defective.
Replace the CU 301 and give the new system a number be-
tween 1 and 64 in order to obtain correspondence between the
numbering of the SQE pump and the CU 301.
Note: Two systems on the same mains supply must not have the
same number!
Is the LED “No contact to pump” of the new CU 301 also on?
Yes: The CU 301 is OK. Go to point e).
No: The CU 301 which was removed is defective.
f) The MSE 3 motor
communication
part is defective.
As a consequence of the above-mentioned checks, replace the
MSE 3 motor.
6. Even AFTER
replacement,
the CU 301 in-
dicates “No
contact to
pump”.
a) Numbering of
SQE pump and
CU 301 is differ-
ent.
If an SQE/CU 301 system has been given a number, this number
is stored in both the SQE and CU 301.
A new CU 301 will probably not have a number corresponding to
the number stored in the SQE. Therefore, “No contact to pump”
is indicated even if there is no fault.
Give the new system a number between 1 and 64 in order to ob-
tain correspondence between the numbering of the SQE pump
and the CU 301.
Note: Two systems on the same mains supply must not have the
same number!
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