4 – 38 Repair Manual RRE140/160/180/200/250 © BT
Functions and parameters
Operation and connection sequences
T-code Valid from serial number Date Publication No.
815, 816 6051502 2008-08-21 261828-040
Event: 12. Fork lift
Previous event 3. Basic control criteria.
Action(s) The control for the fork lift [B20] is moved towards the operator and
input A1-X505:2 is reduced from approximately 2.6 V to approximately
0.6 V at the end position of the control.
Contributing factors Service parameter 1261: Transition flows during raising.
Resulting conditions The pump motor is supplied with three-phase voltage from the transis-
tor regulator [T2].
Free lift:
Output T2-K1:10 “OUT.(PWM) INITIAL MAST LIFT” reduces the volt-
age.
Output A5-131:26 “OUT(PWM) MAIN MAST LIFT” retains the full volt-
age.
Current flows through the proportional valve [Q3].
The proportional valve [Q3] is opened in proportion to the current that
flows through.
Proportional valve [Q2] closed.
Transition between free lift and main lift:
Output T2-K1:10 “OUT.(PWM) INITIAL MAST LIFT” successively
increases the voltage at the same time as output A5-131:26
“OUT(PWM) MAIN MAST LIFT” successively reduces the voltage.
Proportional valve [Q3] begins to close at the same time as propor-
tional valve [Q2] begins to open.
Main lift:
Output A5-131:26 “OUT(PWM) MAIN MAST LIFT” reduces the voltage.
Output T2-K1:10 “OUT.(PWM) INITIAL MAST LIFT” retains the full volt-
age.
The proportional valve [Q2] is opened in proportion to the current that
flows through.
Proportional valve [Q3] closed.
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