Service Training
Section 6
Page 30
6.2.3 Raised forks position sensor lift stop - 1B4
The 1B4 sensor, mounted on all the trucks, stops the lift before the mechanical stop of the elevator system
to limit the pressures in the circuit and to handle the pump motor.
It also has the function of preventing too high pressure in the brake hydraulic system (forced braking
without load).
Operation
- The lift is controlled via 2S6 => The fork arms climb.
- Arrives in high position => The sensor 1B4 is activated.
- The lift is stopped via 1B4 => The lowering function is engaged (controlling 2Y2).
- The fork arms lower => They leave the high position.
- The sensor 1B4 is deactivated. => The lowering function is stopped.
- The lift is no longer authorised. => The motor is no longer supplied, even if 2S6 is activated
- To retrieve the lifting function => Activate the lowering button once 2S7.
Connector 2X14
Terminal
Colour Function
1 WH(16) Signal
2 BK(84) Negative supply
LAC
LIFT STOP 1B4
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