IMT DA435HAR, User Manual, Page: 27 / 34

DA435HAR: 99900683: 6-3 19950918
6-2-4. REMOTE ENGINE SPEED (FROM
CRANE)
Engine speed can be controlled from the remote
control handle. When the engine speed switch is
activated, voltage is applied at terminal 10 of relay
“E”. The coil of relay “E” is energized and current
is allowed to flow to the speed control coil. The
speed of the engine will remain higher as long as the
engine speed switch in the remote control handle is
allowed to remain in the same position. If this
switch is returned to its original position, the engine
speed control coil will be de-energized through relay
“E”.
6-2-5. COMPRESSOR ENGINE SPEED
CONTROL (COMPRESSOR ONLY)
When the compressor “kicks in” or goes into the
charging mode, the engine speed of the vehicle is
increased; when it “kicks out” or goes in the
unloading mode, the engine speed is reduced.
When the compressor goes into the charging mode,
terminal 5 of relay “C” energizes the coil in the
relay, connecting terminal 4 to terminal “C” of the
relay which is “HOT” from relay “B”. Reference
Figure F-7 showing circuits energized (in bold)
when engine speed is increased by the compressor.
6-2-6. ENGINE SPEED CONTROL WHEN
BOTH CRANE AND COMPRESSOR ARE
USED SIMULTANEOUSLY
When the engine speed has been increased from the
remote control handle to operate the crane, it (the
speed) will remain unchanged regardless of the
speed signals received from the compressor.
If, however, the crane is operated at slow engine
speed simultaneously with the compressor, the speed
increase signals from the compressor will increase
engine speed. To prevent the compressor from
unexpectedly increasing the engine speed when
handling a load with the crane, an isolator (relay
“B”) has been placed in the circuit. This relay “B”
is energized separately from the crane compartment.