BPW ECO Tronic EBS Operating And Installation Instructions page 60

5 Installation and Operating Instructions
5.1 Brake system
5.1.3 Trailer Control Module TrCM +
Mode of Operation
Supply line coupled (Fig. 103 + 104):
When the supply line is connected, the supply pressure provided
by the tractor is available to the braking system in full, the service
brake is released and the spring brakes are operating. When the
overfl ow pressure is exceeded, supply pressure is also available
to the auxiliary devices. When pressing the parking valve (red
button), the spring brakes will be ventilated and thus the parking
brake (Fig. 104) will be released.
Brake line coupled (Fig. 104 + 107):
When pressure is introduced through the service coupling, the
pressure is passed on to port 21 through control port 4 without
reduction (no relay effect).
Parking brake activation (Fig. 104, 107 + 108):
When the parking valve (red button) is pulled, the spring brake
unit at port 2 is connected to the exhaust port 3. The pressure
in the spring brake unit therefore falls, and the parking
brake is applied.
When the parking valve is pushed, the spring brake system
at port 12 is connected to the air supply reservoir, ports
1-2. The pressure in the spring brake system therefore
rises, and the parking brake is released again.
The parking brake system must always be released manually
after uncoupling. The release can, however, only be effected
when a pressure of at least 5.0 bar is available in the supply
reservoir (Fig. 104).
Release device for service braking system (Fig. 105 + 106):
The shunt valve (black button) makes it possible to release
the automatic braking („emergency braking") that is triggered
when the supply line is disconnected (cf. EWG-RL, Annex I,
Paragraph 2.2.2.11 or ECE-R13, Paragraph 5.2.2.11). The
automatic braking of the service braking system is cancelled
when the shunt valve is pressed (with the supply line / brake line
uncoupled). This is caused by the disconnection of combination
of port 21 to port 1-2 and production of a connection from port
21 to port 4 (exhaust from the yellow hose coupling). When
the supply line is reconnected and compressed air is applied,
the shunt valve automatically switches back into the normal
operating position.
Manoeuvring operation (Fig. 106):
In order to manoeuvre the uncoupled vehicle, both the operating
knobs, black service braking system and red spring braking
system, must be pressed. Only this ensures that the service
braking system / spring braking system are released and that
the vehicle is not braked. The parking valve must be pulled again
when the manoeuvring process is complete.
Caution Danger!
There must not be anybody in the hazardous area
when coupling or uncoupling.
60
Initial charging
24 23 1-2
25
1
Fig. 103
Pressure rise approx. 6.2 bar
24 23 1-2
25
1
Fig. 104
Emergency braking
24 23 1-2
25
1
Fig. 105
4 21 12
2
3
4 21 12
2
3
4 21 12
2
3