Robland KM 775, Instruction Manual

Page: 35 / 70

Instructions manual KM 775 - 785
28
7 TROUBLESHOOTING:
7.1 Machine does not start:

Check the machine air inlet pressure (it must be between 6 and 7 bar). If it is lower
than 4 bar for even a moment, the machine will stop or fail to start.

Check that the emergency stops are not activated (the two at the presser ends). If
so, turn them smoothly to deactivate them.

The cabin must be completely closed for the cabin micro to allow machine start-up.

Having checked these external points, access the electrical panel and first verify
that the pilot on PLC 01 INPUT is illuminated. If not, it means the machine is not
starting because one or more of the safety systems is activated. After checking
these, the only remaining check is on the thermal cutout relays. To do this, press
the reset buttons; any making a different noise indicates that this particular relay
was activated. Make a note of the number (e.g. F-14), and check on the power
diagram to see which motor it is protecting. Then examine the motor involved, as a
thermal cutout trips because of overworking, unsuitable working or very poor tool
condition (the relay is set to the rated consumption of the motor it is protecting, and
trips if this consumption is exceeded to avoid damaging the motor).

Check the fuses and input voltage.
7.2 Irregular band feed:

First check that machine air inlet pressure is correct (between 6 and 7 bar).

Carry out a feed and check that the pressure supplied to the pressure piston is
approximately 0.9 bar as measured on pressure gauge MR-3 (bear in mind that
this usually reads zero, and only gives a pressure reading when actually being
supplied, for a time of about 1.5 seconds). If air pressure is too high, the edge is
compressed so much that it cannot move forward properly, while insufficient air
pressure means the weight of the strip can`t be pulled through.

Check the condition of the angle bevel box transmission pulley, as it will very
probably need tensioning (follow the instructions given in the special maintenance
section).

Feed rollers in poor condition or not correctly positioned (check they are properly
fitted in their securing slots).

Make sure the roll of edging isn`t obstructed in any way that prevents it moving
normally (e.g. small strips of adhesive tape stuck to the bottom of the roll and
difficult to see at first sight).
7.3 The end trimming station moves the piece when the board is
passed through it:

First read the “V-7 End trimming station” section carefully and check that all
pneumatic pressures are correct.

Disconnect air pressure from the machine and verify manually that the station
makes all its movements smoothly.

Clean the carriage guide bars and tracers with a cloth dampened with machine
grade oil, then dry off to avoid dirt sticking to them.