CONNECTING PRESSURE SWITCH
The electric connection between pressure switch and Tmax is made of the two-core lead supplied.
Pins 1 and 3 of the pressure switch are connected to the corresponding ports on the switch unit as illustrated. The allocation
of pins on Tmax connecting to the pressure switch is not of any relevance. Just make sure that on the pressure switch only
pins 1 and 3 are used!
The nozzle of the pressure switch is connected via a silicone hose (4/2 mm) to an outboard connector (brass, 4/3 x 15 mm), drilled and
glued into the outer walling of the hull. Refer to "Wiring and Functional Diagram" for further detail.
For submarine type VII/c this outboard connector is already pre-fitted within the main drive unit.
After all connections have been made the system can be put to the test.
FUNCTIONAL TEST of Piston Tanks
Before initial operation of the Piston Tanks, draw out the spindles so that these are extended to the level of the motor back plate. This
must be done by hand - do not connect a battery directly to Piston Tank motors - otherwise the switch unit might be damaged!
The initial extended position of the spindles is crucial in order to safely determine the correct running direction of the Piston
Tank motors. If one or both spindles are drawn inwards although the "submerge mode" is activated, the polarity of the motors
must be changed by swapping the wires on the motor (NOT the switch unit!).
Follow this sequence for activation of the dive system:
1.
switch ON Transmitter
2.
switch ON main battery
3.
switch ON receiver
Any other sequence will lead the Tmax to fall into one of the following safety modes:
1.
transmitter NOT ON: loss of signal
2.
main battery NOT CONNECTED or WEAK: low battery monitor activated
3.
transmitter NOT ON: Tmax shows NO function
Any failure criteria leads to deactivation of the dive mode!
These safety prompts are necessary to ensure maximum safety of the boat.
In case of wrong sequence during activation of Tmax, switch off receiver and restart. The system is then ready for action (unless the
main battery is too weak).
Please note: sufficient receiver battery power is also necessary for functioning of the system. Unless you are using BEC, a high power
receiver battery pack (e. g. NiMH 4.8V/3000mAh, item no. 5528) is highly recommended.
FUNCTIONAL TEST of Pressure Switch
When blowing forcefully into the tube of the pressure switch the "resurface mode" will automatically be activated even if the "submerge
command" is given. If the "submerge mode" is activated and the Piston Tanks are running, the signal of the pressure switch will overri-
de this command and force the model to resurface.
The pressure switch acts as a safety device which comes into action as soon as the model has submerged beneath a depth of approx.
1.8 meters, forcing the model to resurface. However, activation of the pressure switch depends on Water Tight Compartment (WTC)
volume (set for ENGEL standard WTCs).
The pressure switch incorporates a further safety feature:
If the over pressure of approx. 0.12 bar inside the hull (which develops by compressing the air within the hull when flooding the tanks)
decreases due to a leakage, the pressure switch will terminate the "submerge mode" allowing the model to resurface only. This feature
ensures that only a minimum amount of water may enter the WTC in case of a leaking O-ring or other kind of gasket.
As long as the leakage remains the model cannot be submerged.
To assure the full functionality of the model the WTC must be absolutely hermetically sealed.
Even a small leakage will cause a deactivation of the "submerge mode".
Tmax
V2
Item No. 1584-TMX
1584-TMX
v11-08
4
