Warning Messages - DEMAG DC-Com 1 Operating Instructions Manual

9.4

Warning messages

In general, all warning messages are generated by comparison of the actual and theoretical speed. There may be
various causes for a difference in speed:
● incorrectly adjusted slipping clutch;
● a binding brake or
● a dirty or defective speed sensor.
These causes may result in frequent warning messages. Various measures must be taken to eliminate the
warning messages:
- clean the speed sensor with compressed air (e.g. dirt accumulation on the photo cell);
- check and, if necessary, adjust the slipping clutch;
- check and, if necessary, adjust the brake air gap.
Fig. 73 Display examples
Item Display Malfunction/event
1 .1. SLIP LIFTING start-up: No
lifting.
No lifting with load.
2 .2. SLIP LIFTING V1: Cut-out
in the upper limit position.
3 .3. SLIP LIFTING V2: Cut-out
in the upper limit position.
Fast lifting with load is
switched off.
4 .4. Defective internal data
memory.
6 .6. No speed information.
7 .7. SLIP LOWERING start-up:
No lowering.
8 .8. SLIP LOWERING V1: Low‐
ering is switched off, lower
limit position is not
reached. Cut-out in the
lower limit position
9 .9. SLIP LOWERING V2: Low‐
ering is switched off, lower
limit position is not
reached. Cut-out in the
lower limit position
Tab. 69
98
Possible cause
A mains phase is missing or the motor is blocked.
Chain hoist overloaded or undervoltage.
Limit switch contact is no longer actuated.
Limit switch contact is no longer actuated.
Chain hoist overloaded.
Defective control system.
Hardware monitoring malfunction.
A mains phase is missing or the motor is blocked.
Chain blocked.
Limit switch contact is no longer actuated.
Chain blocked.
Limit switch contact is no longer actuated.
Remark
Check mains connection and fuse link; check connection
cable for interruption; check mains connector in the service
enclosure.
Reduce load to the permissible load capacity. Ensure ap‐
propriate mains voltage.
(-.) is displayed when the limit switches function correctly.
The slipping clutch acts as an emergency-stop device if
there is a malfunction.
Limit switch contact connection and operation must be in‐
spected by an experienced technician.
(-.) is displayed when the limit switches function correctly.
The slipping clutch acts as an emergency-stop device if
there is a malfunction.
Limit switch contact connection and operation must be in‐
spected by an experienced technician.
Reduce load to the permissible load capacity.
Replace control system.
Repeat lifting process; if the load does not move, have the
brake and control system checked by an experienced tech‐
nician.
Check mains connection and fuse link; check connection
cable for interruption; check mains connector in the service
enclosure.
Check chain entry point, replace chain, if required.
(-.) is displayed when the limit switches function correctly.
The slipping clutch acts as an emergency-stop device if
there is a malfunction.
Limit switch contact connection and operation must be in‐
spected by an experienced technician.
Check chain entry point, replace chain, if required.
(-.) is displayed when the limit switches function correctly.
The slipping clutch acts as an emergency-stop device if
there is a malfunction.
Limit switch contact connection and operation must be in‐
spected by an experienced technician.