(3) Adjustment of VR ON (Accelerator ON position) and FLOW ADJ (Flow-control) standard setting
The graph below shows the correlation with triggering ratio:
Comment:
At first, when it is started triggered, only the flow rate (lever actuating ratio) increases. Just before the flow rate (lever actuating ratio)
reaches its maximum point, the accelerator is started to be ON. This improves manipulability in Micro Speed mode which allows
smooth acceleration up to the maximum speed.
It is not advisable that users change this value, since manipulability may become poor when the balance is lost by changing it.
Advise:
1. In case that VR ON (Accelerator ON position) is set to “0”, the crane speed is picked up in proportion to engine rev, which results
poor manipulability.
2. In general, response of the engine by accelerator is poor in comparison to triggering ratio. This causes tendency of inferior
manipulability in Micro Speed mode. Thus, when it is started triggered, manipulability in Micro Speed mode improves when the
pick up of accelerating is set slower.
3. In case that lapping margin, of Note 1:) in the graph, is not secured, VR ON (Accelerator ON position) and FLOW ADJ
(Flow-control) may generate a certain range where the speed shall not be controlled even when the triggering ratio increases.
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