26.03.1996 • KHH SEENXL13A
•For Authorized KCI Service Agents Only•
KCI Hoists Corporation reserves the right to alter or amend the above information without notice
Page 20
XL
Service Manual
CU1
KCI KONECRANES GROUP
KCI HOISTS CORPORATION
6 TROUBLE SHOOTING
Carry out the trouble shooting according to the information given on the CU1's front
panel (display and indicator lights).
If any of the red alarm lights is lit or blinking, check out if it is caused by a normal
supervisory function (e.g. the hoisting motor is overheated).
If the problem still occurs follow the instructions given below. The wiring diagrams of the
crane and a multimeter are needed during the trouble shooting.
By replacing the CU1 it is possible to determine if the failure is an external failure or
caused by the CU1 itself. If a problem still exists after replacing the CU1, it is most likely
an external failure.
Check always the external wiring and sensors before justifying that the CU1 is broken!
Fill in the CU1 control page (see Appendix 8) and follow the instructions given in
Appendix 3 if the CU1 has to be changed.
6.1 CU1 looks normal but lifting does not work
First, check that there are no alarms on and no error-messages displayed!
1 Measure that control voltage exists at CU1:9 while the upwards push-button is
pressed.
a) If there is no voltage, check the wiring between the control station and CU1:9.
2 Check the operation of the hoist inhibit switch inside the CU1. Bypass the CU1
by connecting a jumper between CU1:9 and CU1:10. See note 1!
a) If lifting now works properly, change the CU1.
-If the fault still exists, check again the wiring and the function of contactor
A-K1 (and A-K7).
b) Remove the jumper between CU1:9 and CU1:10.
Note:
Note:Note:
Note:
If a CU1 must be bypassed during trouble shooting, note that all CU1's
If a CU1 must be bypassed during trouble shooting, note that all CU1'sIf a CU1 must be bypassed during trouble shooting, note that all CU1's
If a CU1 must be bypassed during trouble shooting, note that all CU1's
safety features are removed as well - remember to return the original
safety features are removed as well - remember to return the originalsafety features are removed as well - remember to return the original
safety features are removed as well - remember to return the original
connections after the trouble shooting!
connections after the trouble shooting!connections after the trouble shooting!
connections after the trouble shooting!
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