Functions and parameters
Operation and connection sequences
Publication No. Date Valid from serial number T-code
261828-040 2008-08-21 6051502 815, 816
© BT Repair Manual RRE140/160/180/200/250 4 – 39
Event: 13. Fork lowering
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.
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