Previous event 3. Basic control criteria.
Action(s) The control for fork lift [B20] is moved away from the operator and input A1-X505:2 increases from approximately 2.6 V to approximately 4.7 V at the end position of the control.
Contributing factors Service parameter 1262: Transition flows during lowering.
Resulting conditions Main lift:
Output A5-131:40 “OUT(PWM) MAIN MAST LOWER” reduces the volt-age
Output T2-K1:2 “OUT.(PWM) INITIAL MAST LOWER” retains the full voltage
The proportional valve [Q4] is opened in proportion to the current that flows through
Proportional valve [Q5] closed
Transition between main lift and free lift:
Output A5-131:40 “OUT(PWM) MAIN MAST LOWER” successively increases the voltage at the same time as output T2-K1:2 “OUT.(PWM) INITIAL MAST LOWER” successively reduces the voltage.
Proportional valve [Q4] begins to close at the same time as propor-tional valve [Q5] begins to open.
Initial lift:
Output T2-K1:2 “OUT.(PWM) INITIAL MAST LOWER” reduces the volt-age.
Output A5-131:40 “OUT(PWM) MAIN MAST LOWER” retains the full voltage.
The proportional valve [Q5] is opened in proportion to the current that flows through.
Proportional valve [Q4] closed.
Event: 14. Fork tilt, backwards/upwards
Previous event 3. Basic control criteria.
Action(s) The control for the fork lift [B22] is moved towards the operator and input A1-X505:17 is reduced from approximately 2.6 V to approxi-mately 0.6 V at the end position of the control.
Contributing factors –
Resulting conditions The pump motor is supplied with three-phase voltage from the transis-tor regulatransis-tor [T2].
Output A5-X131:37 “OUT.AUX DIRECTION A” reduces the voltage.
Output A5-X131:11 “OUT.AUX DIRECTION B” remains high.
Current flows through the coil [Q8].
The tilt cylinder is pressurised via the non-return valve.
On sideshift, or some other optional function: the following also applies:
Output A5-X131:38 “OUT.TILT/SIDESHIFT/AUX 1” remains high.
No current flows through the coil [Q18].
Event: 15. Fork tilt, backwards
Previous event 3. Basic control criteria.
Action(s) The control for fork lift [B22] is moved away from the operator, and input A1-X505:17 increases from approximately 2.6 V to approximately 4.7 V at the end position of the control.
Contributing factors –
Resulting conditions Output A5-X131:37 “OUT.AUX DIRECTION A” remains high.
Output A5-X131:11 “OUT.AUX DIRECTION B” reduces the voltage.
Current flows through the coil [Q9].
The tilt cylinder is drained to the tank.
On sideshift, or some other optional function: the following also applies:
Output A5-X131:38 “OUT.TILT/SIDESHIFT/AUX 1” remains high.
No current flows through the coil [Q18].
Event: 16. Sideshift, right
Previous event 3. Basic control criteria.
Action(s) The control for the fork lift [B23] is moved towards the operator, and input A1-X505:3 is reduced from approximately 2.6 V to approximately 0.6 V at the end position of the control.
Contributing factors Sideshift as an optional function.
Resulting conditions The pump motor is supplied with three-phase voltage from the transis-tor regulatransis-tor [T2].
Output A5-X131:37 “OUT.AUX DIRECTION A” remains high.
Output A5-X131:11 “OUT.AUX DIRECTION B” reduces the voltage.
Current flows through the coil [Q9].
Output A5-X131:38 “OUT.TILT/SIDESHIFT/AUX 1” reduces the volt-age.
Current flows through the coil [Q18].
The piston rod end of the sideshift cylinder is drained to the tank.
Event: 17. Sideshift, left
Previous event 3. Basic control criteria.
Action(s) The control for fork lift [B23] is moved away from the operator, and input A1-X505:3 increases from approximately 2.6 V to approximately 4.7 V at the end position of the control.
Contributing factors Sideshift as an optional function.
Resulting conditions The pump motor is supplied with three-phase voltage from the transis-tor regulatransis-tor [T2].
Output A5-X131:37 “OUT.AUX DIRECTION A” remains high.
Output A5-X131:11 “OUT.AUX DIRECTION B” reduces the voltage.
Current flows through the coil [Q8].
Output A5-X131:38 “OUT.TILT/SIDESHIFT/AUX 1” reduces the volt-age.
Current flows through the coil [Q18].
The piston rod end of the sideshift cylinder is pressurised.
Event: 18. Ergo cabin, tilt up
Previous event 12. Fork lift
Action(s) –
Contributing factors Factory parameter 1104: Permitted cabin tilting.
Factory parameter 1259: Calibration, Ergo cabin up
Resulting conditions Output T2-K1:10 “OUT.(PWM) CABIN TILT UP” reduces the voltage.
The proportional valve [Q11] opens in proportion to the voltage applied to it.
The cabin tilt cylinder is pressurised.
Event: 18. Ergo cabin, tilt down
Previous event 13. Fork lowering
Action(s) –
Contributing factors Service parameter 355: Offset, cabin tilting down Factory parameter 1104: Permitted cabin tilting.
Factory parameter 1260: Calibration, Ergo cabin down.
Resulting conditions Output T2-K1:2 “OUT.(PWM) CABIN TILT DOWN” reduces the voltage.
The proportional valve [Q21] opens in proportion to the voltage applied to it.
The cabin tilt cylinder is drained to the tank.
Event: 19. Logout
Previous event 2. Login.
Action(s) The operator presses the red button.
Contributing factors –
Resulting conditions The login screen is displayed and login is possible.
The screen to be displayed is determined by service parameter 503.
4.8.1 General overview
Key
[ ] = reference to electrical component in the wiring diagram.
{high} = refers to a voltage level of around 48 V.
{low} = refers to a voltage level of around 0 V.
Components
ACT = Traction transistor regulator [T1] (AC Traction) ACH = Lift transistor regulator [T2] (AC Hydraulic)
CAN = Communication network (Controller Area Network) CID = Central display [A1] (Central Information Display) EPS = Steering servo [A2] (Electronic Power Steering) ESD = Static discharge (Electrostatic Discharge) GFU = Universal unit (General Function Unit) [A8]
LID = Upper display [P6] (Load Information Display) (option) MCU = Main processor [A5] (Main Control Unit)
All these components intercommunicate via two CAN buses with the MCU connected to each. The CID and LID use the first CAN bus and the EPS, ACT and ACH use the second.
In its closed position, the main contactor [Q10] supplies the power stage of the truck, e.g. ACT and ACH.
In its closed position, the key contactor [K20] supplies other electronic units
General
The MCU is the main processor in the truck and communicates with the traction transistor regulator, the lift transistor regulator, the steering ser-vo and the displays via two CAN networks. The truck parameter and error code settings are also stored in the MCU. A back-up copy of the parameters is also saved in the CID.
The MCU monitors and regulates the truck functions relating to steer-ing, drivsteer-ing, braksteer-ing, hydraulics, communication and various other things.
The TruckCom service program must be used for downloading new software.