Electric Travel Direction Valve (For Da, Ha.r) - Bosch Rexroth A6VM series 71 Manual

24 A6VM series 71 | Axial piston variable motor

Electric travel direction valve (for DA, HA.R)

Electric travel direction valve (for DA, HA.R)
Application in travel drives in closed circuits. The travel
direction valve of the motor is actuated by an electric signal
that also switches the swivel direction of the travel drive
pump (e. g. A4VG with DA control valve).
If the pump in the closed circuit is switched to the neutral
position or into reverse, the vehicle may experience jerky
deceleration or braking, depending on the vehicle's mass
and current travel speed.
When the travel direction valve of the pump (e. g. 4/3-direc-
tional valve of the DA-control) is switched to
▶ the neutral position, the electric circuitry causes the
previous signal on the travel direction valve on the motor
to be retained.
▶ Reversing,
the travel direction valve causes the travel direction
valve of the motor to switch to the other travel direction
following a time delay (approx. 0.8 s) with respect to the
pump.
As a result, jerky deceleration or braking is prevented in
both cases.
▼ Circuit diagram - electric travel direction valve
Travel direction
valve
24 V DC
V
N
R
K1. 1
V1
K2. 1
A3
K1
The diodes and relays shown are not included in the scope
of delivery of the motor.
Bosch Rexroth Corp., RE-A 91610/12.2015
Solenoid a
K2
Pump
Solenoid b
Pump
K1.2 24 V DC
B3
Solenoid a
Motor
A2
▼ Control DA1, DA
b
a
▼ HA1R., HA2R. control
a
b
Switching solenoid a on the travel direction valve
b
a