
Troglotech T815 Crawler User Manual Page 8
THE AUTO CABLE DRUM
AUTO
This is the setting used for normal operation. The cable can be pulled from
the drum by hand or by the crawler. The drum is designed to provide a small
amount of tension in the cable so that if it is released the cable will return to the
drum. Auto works with or without the crawler so that cable can be pulled from the
drum without the crawler connected, the cable can then be connected to the
crawler when in place and the survey can start. There are no voltages or power in
the cable and it is safe to handle.
The cable drum will release cable when the crawler is moving forwards always
keeping a small amount of tension. It is the crawler that pulls the cable, the drum
uses its motor to keep in synchronisation with the crawler. The longer the forward
button is pressed the faster the crawler will move, press stop to halt the crawler
In reverse the Drum will pull the crawler back, in this mode the crawler
disconnects its wheel drives to allow it to be pulled. The longer the reverse
button is pressed the faster the crawler will move, press stop to halt the crawler.
In reverse the drum can provide a lot of pulling force so ensure the drum is
placed so that it cannot move or be pulled into a culvert.
In normal use (including transportation between sites) the drum can remain in
Auto.
TENSION
This mode allows the crawler to reverse under its own power and should be
used carefully ensuring the crawler does not run over the cable. This mode can
be used when the crawler needs to be manoeuvred, for instance if the crawler is
blocked by an obstruction when retrieving. This allows the crawler to power itself
over obstruction. In all other circumstances leave the drum in AUTO
DRUM LOCK and MANUAL REWIND
This position is used to lock the drum for transportation and for manually
rewinding the cable after the crawler has been removed or if the crawler battery is
exhausted. With the handle released in the DRUM LOCK position the motor
brakes are automatically applied. When the handle is lifted upwards from Drum
Lock cable will be rewound onto the drum. The further the handle is lifted away
from the DRUM LOCK position the faster the drum will rotate.
Manual Rewind can be used if the crawler has exhausted it’s power and
needs to be retrieved to replace the battery.