Instructions - Kubota WSM J Series Workshop Manual

J SERIES, WSM

(2) Instructions

For Z482 and D722
1. Circuit configuration
As shown in the block diagram above, Emergency Relay-1 (EG-1) comprises a delay timer for preventing the start
of fault detection till the rise of oil pressure: a sensor input circuit for checking the oil pressure and the water
temperature: a drive timer for energizing a stop solenoid (11) for a given time period in case of a fault input from
a sensor: a drive circuit for a relay: and a relay for energizing the stop solenoid (11).
2. Details of the circuit
- Delay timer circuit
Sets the delay time between the disengagement of the starter and the start of sensing. The timer operates on
voltage from terminal 50 of the key switch (1).
- Sensor input circuit (9)
Monitors the oil switch (4) and the water temperature switch (3). When either of these switches is grounded for
about 4 ms or more, the circuit will decide that sensor trouble has occurred, and provide output to the drive timer.
- Drive timer circuit
Sets the time for which to operate the stop solenoid (11). Upon receipt of an output from the sensor input circuit
(9), the timer will start to operate.
- Drive circuit (7)
Drives the relay circuit (8) for a given delay time upon receipt of an output from the drive timer.
Consists of a power transistor, and a diode to remove surge volts from the relay.
- Relay circuit (8)
Provides output to the stop solenoid (11) through a power relay. A variator is incorporated to prevent surge
voltage that would be otherwise generated when current to the stop solenoid (11) is cut off.
3. Operating principle EG-1 controls so that:
- While an attempt was made to start the engine with the key switch (1) in the start position (50), the oil switch (4)
and water temperature switch (3) do not operate for fault detection.
- When the key switch (1) is returned to the ON position (AC), from the position mentioned in step above, a state
will occur where fault detection is possible after an elapse of 9
(68F)).
- When the key switch (1) is turned to OFF after the start of the engine, or the water temperature switch (3) or oil
switch (4) detects a fault, the stop solenoid (11) will be energized for 10
and then disenergized.
(1) Key Switch
(2) Battery (12 V)
(3) Water Temperature Switch
(4) Oil Switch
(5) Emergency Relay
(6) Timer Circuit (Start Delay Circuit)
(7) Drive Circuit
(8) Relay Circuit
(9) Sensor Input Circuit
(10) Timer Circuit (Stop Relay Circuit)
(11) Stop Solenoid
±
3 seconds (at starter starting voltage and 20C
±
3 seconds (at 12 V and 20C (68F)),
M-5
GENERATOR
W10132090
KiSC issued 10, 2016 A