Fiat Kobelco EX355 Tier2, Техническое руководство

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T2-3-20 EX355
ELECTRICAL SYSTEM
ENGINE AND PUMP CONTROL CIRCUIT
The main controller (MC) monitors all digging func-
tions, travel functions, and hydraulic pump functions
Further the main controller stores possible malfunc-
tion conditions of hydraulic and electrical system
generating faults codes that can be detected from
the diagnostic instrument (Dr.EX).
The main controller(MC) receives as input signals:
- from panel switch the signals related to the travel
speed, the auto idle position and work mode selec-
tion;
- from the R.H. control lever hand grip the input signal
of power boost;
- from engine speed control dial panel the engine
speed signal and mode switches E and HP signals.
To provide the required functions, the main controller
(MC), compares these input signals with instant con-
ditions detect from various pressure switches and
sensors and provide output signals for the engine
speed control (by means of the operation of EC
motor), and for the pump control circuit (by means of
solenoid valves operation).
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Engine speed control circuit
The engine speed control circuit consists of engine
control dial, E and HP mode switches Auto Idle
switch, N sensor and EC motor and angle sensor
assembly.
The engine control dial adjusts the engine revolu-
tions independently of positions of E mode, HP
mode switches.
The engine control dial sends an electrical signal to
the main controller proportionally to the engine
control dial angle. (This signal can be detected from
Dr.EX with monitor function by selecting:
Target
engine speed).
The N sensor supply signal to the main controller
indicating the engine speed. (This signal can be
detected from Dr.EX with monitor function by se-
lecting:
Actual engine speed).
In order to change the engine speed, the main
controller sends signals to the EC motor, that re-
volves and controls the governor lever. (This signal
can be detected from Dr.EX with monitor function by
selecting:
EC motor position).
The EC angle sensor detects the position of EC
motor and supplies signals to the main controller to
indicate the position of the governor lever. (This
signal can be detected from Dr.EX with monitor
function by selecting:
EC angle).
The main controller (MC) compares and processes
the input signals and if the engine requires engine
speed changes, it supplies power to the EC motor
in order to change the position of governor lever.