Konecranes CU1 - Page 29

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 29
XL
Service Manual
CU1
KCI KONECRANES GROUP
KCI HOISTS CORPORATION
Normal action: Switch the power off for at least 5 seconds. If this does not help,
change the CU1.
Err_12: OVERTEMPERATURE INSIDE CONTROL PANEL (≥ P2.13) - CU1 has detected that the
temperature inside the control panel is too high.
Normal action: Check the temperature of CU1 - If the temperature is > 50°C
inside the control panel, wait till it is back to normal. If this does not help, change
the CU1.
Err_A: MEMORY ERROR, EPROM - The check sum of the program memory is not correct.
Normal action: Switch the power off for at least 5 seconds. If this does not help,
change the CU1.
Err_b: A BLOCKED HOIST ERROR (≥ P2.03) - The CU1 has detected a possible fault in its
internal safety circuit.
This error may also occur when the lifting request (UP command) has been ON
only for a very short time (less than 0,5 sec) - in this case no further actions
required.
Normal action: Switch the power off for at least 5 seconds. If this does not help,
change the CU1.
Err_c: HOIST ACTIVE ERROR: The CU1 has detected that the hoisting contactor is not
working correctly (i.e. the hoist active signal is not received). Lifting is prevented for
safety reasons.
Normal action (after accepting HOIST UP command):
1 Check to see if the CU1 switches the display off during lowering motion.
-If the display is switched off, check the wiring of hoisting and brake
contactors (A-K1 and A-K7). The active signal (CU1:13-CU1:14) must be
switched in 150 msec (≤ P2.12) or in 1 sec (≥ P2.13) after hoisting request
appears at CU1:9.
2 Measure the voltage between CU1:13 and CU1:14 during standstill
(ca. 18 VAC).
-If the 18 VAC voltage is missing, check the 18 VAC voltage at the CU1's
transformer (O-T2).
3 Measure the voltage between CU1:13 and CU1:14 during lowering motion
(ca. 0 VAC).
-If the 18 VAC voltage still exists, check the wiring of the hoisting and
braking contactors (A-K1, A-K2 and A-K7).
-If the voltage is ca. 0 VAC, change the CU1. Check also that the ambient
temperature inside the electrical cubicle is within specified limits
(-25...+50°C).