2009 by ELTRA GmbH Germany – July 2009 – Service Manual Thermostep
Page 25
2.3
Cover doesn’t close/open
Error message: “Something wrong with furnace opening!”
Pleae note:
If movement of the cover accompanied with jerky movement please read d.)!
This problem could be caused by:
a.)
insufficient pressure of compressed air
b.)
incorrect adjustment of the sensors for the cover
c.)
a defective valve at the valveblock
d.)
a defective cylinder
e.)
a defective pressure switch
At a.) To move the cover a gas pressure of compressed air of at least 4 bar (better 4,5 – 5 bar)
is necessary. Check if gas pressure of compressed air is sufficient (see Fig. 2.2)!
At b.) If the sensors for cover movement are not adjusted correctly, the movement of the
cover is possible and takes place, but there is no reply at the software from the respective
sensor. So the started movement cannot finished completely.
Movement of the cover is accompanied by an acoustic signal that ends when the sensor reply
to software that movement is finished. If one of the sensors is not adjusted correctly the
accustic signal don’t stops despite the cover is closed or opened completely. Check the
respective sensor (cover open up: front sensor; cover closed down: rear sensor) at the cylinder
(RHS) and adjust it properly (see
1.15
). The accustic signal stops directly when the sensor
reaches its detection area!
Please note:
The working procedures described below should be done with cover closed,
because a break of compressed air supply can cause a slam of the cover due to its dead
weight.
At c.) Check the functionality of the corresponding valve (LHS; 2. valve at the valveblock)
and replace it if necessary (see
3.1
)!
At. d.) Check if the tubes are fitted correctly at their connectors at the cylinder (see Fig. 1.11).
Listen for sounds that indicates a gas leckage around the cylinder/connectors!
The tube-connectors possesses a coloured ring at their vent. You can remove the tube out off
the connector by pressing this coloured ring and pulling out the tube simultanously. Remove
the corresponding tube completely out off the connetcor and insert it again.
If the sound appears furthermore the tube-connector can be broken and has to be replaced.
The connector can be screwed off the cylinder by a open-end wrench. Afterwards insert the
tube again.
A defect of the lid cushioning is indicated by a sound of gas leckage aswell. The lid
cushioning is closed by a small screw at the rearward downside of the cylinder (small opening
at the rear ring at the cylinder). If there is a leakage at this position, please replace the cylinder
(see
3.4
)!
Jerky movements during opening or closing of the lid indicate at a defective cylinder - at
correctly adjusted speed of covermovement (see
1.15
)! Try to correct this by changing the
speed of movement via the chokes
before
replacing the cylinder (see
3.4
).
