Hitachi ZW180, Technical Manual

Page: 66 / 374

SYSTEM / Control System
T2-1-24
FNR Lever Priority Control
Purpose: To smoothen danger-preventive function in
forward/reverse operation by giving priority to
the signal from FNR lever over the signal
from FNR switch
Operation:
1. In case the FNR lever is operated while traveling
by using the FNR switch, MC disables operation
of the FNR switch, and makes forward/reverse
control by the input signal from the FNR lever.
2. When operating again by using the FNR switch,
the FNR switch is effective again by turning the
FNR selector switch ON while both the FNR lever
and the FNR switch are at the neutral position.
3. Until the FNR lever is operated next from that time,
MC makes forward/reverse control by the FNR
switch input signal.
NOTE: In case short-circuiting takes place inside
the FNR lever, the transmission is made
neutral forcedly, and traveling becomes
impossible, which requires towing. However,
in case the FNR switch is out of order,
traveling by the FNR lever is possible as an
emergency measure.
NOTE: The FNR switch does not transmit the neu-
tral signal. In case of no electric current
from the FNR switch, the controller judges
that the switch is neutral (N).