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Module Communication Error:

communication is lost between the LDU
and MCU modules.

Some of the errors listed above can be
acknowledged and silenced. This is allowed
when the motion control levers are in the neutral
lock position and the LDU middle push button is
pressed down and held.

Acknowledging an error will remove the error
message from the engine temperature, engine
rpm, or fuel level icon area and silence the audible
alarm. However, the error will continue to display
on the active error screen in the Maintenance and
Service Menu and the status LED will continue to
be illuminated red.

– The following errors will emit a slow chirping

sound and can be acknowledged and silenced:

Service Engine Oil

Service Transmission Oil

Fuel Low

Clutch Overcurrent

Clutch Reset Required

Engine Error Codes

– The following errors emit a fast chirping sound

and can be acknowledged and silenced:

System Overvoltage>16VDC

System Undervoltage<9VDC

– The following error codes emit a fast chirping

sound and cannot be acknowledged or
silenced.

Low Oil Pressure

Engine Over Temperature

Engine Communication Error

Module Communication Error

Clutch Output Failure

In order to protect the system components from
exceeding threshold limits, the RED technology
system is designed to limit the engine speed
and/or disengage the clutch which allows the
machine to be driven onto a trailer or returned to a
service area.

There are five errors:

1.

Clutch Overcurrent

If an overcurrent event occurs, the system
will limit the engine speed to the default
Efficient Transport Mode speed and place
the machine in “Safe Transport Mode”. Safe
Transport Mode limits the engine speed,
locks out the PTO, and disengages the

clutch; a “Clutch Overcurrent” error message
will display. Cycling the key switch to “OFF”
and then to the “ON” position will clear the
fault.

2.

System Overvoltage>16VDC

If the voltage exceeds 16 volts, the system
will disengage the clutch and display
a “System Overvoltage>16VDC” error
message.

3.

System Undervoltage<9VDC

If the voltage is less than 9 volts, the
system will not allow clutch engagement
and will display the error “System
Undervoltage<9VDC”. If the clutch was
engaged before the error occurred, the
system will allow the clutch to remain
engaged; however, low voltage may cause
the clutch to disengage itself.

4.

Low Oil Pressure

If low engine oil pressure is detected, the
system will limit engine speed to the default
Efficient Transport Mode speed and place
the machine in “Safe Transport Mode”. Safe
Transport Mode limits the engine speed,
locks out the PTO, and disengages the
clutch; a “Low Oil Pressure” message will
display. Cycling the key switch to “OFF” and
then to the “ON” position will clear the fault.

5.

Engine Over Temperature

When the engine begins to overheat, the
system will flash the engine temperature bar
graph and chirp the audible alarm. If the
temperature rises above the upper limit, the
system will restrict the engine speed to the
default Efficient Transport Mode speed and
place the machine in “Safe Transport Mode”.
Safe Transport Mode limits the engine
speed, locks out the PTO, and disengages
the clutch; an “Engine Over Temperature”
message will display. The fault will clear
once the temperature falls below a safe limit.

17

 

Summary of Contents for LZS850EKA724W0

Page 1: ...ssential Failure to comply with the operating instructions or receive proper training may result in injury Go to http www Exmark com for additional safe operation information such as safety tips training materials and Operator s manuals The patented RED Technology system monitors engine temperature oil pressure and the overall electrical system placing the machine in Safe Transport Mode when criti...

Page 2: ...llowing icons Gauge and Meters Processing Advanced Settings Battery Voltage Maintenance and Service Engine Hours Fuel Level Cancel Exit PTO Toggle Between Screens Park brake Enter Return Neutral Lock Located in top row of Information Screen Previous 2 ...

Page 3: ...OPC Operator Presence Control Next Max Engine Speed Reset Efficient Engine Speed Play Start Low Engine Speed Pause Stop Transmission Oil Maintenance Increase Engine Oil Temperature Decrease 3 ...

Page 4: ...Engine Oil Maintenance Yes No Located on bottom row of some menu screens 4 ...

Page 5: ...n to verify functionality Solid Green indicates normal operating activity Blinking Red indicates a fault is active Blinking Green and Orange indicates a clutch reset is required Push Buttons The multi functional push buttons are located at the bottom of the panel The icons displayed on the information screen above the buttons indicate the current function The push buttons allow the user to select ...

Page 6: ...d non resettable engine hour counter 4 3 Engine On Screen When the engine is running the default screen is shown in Figure 5 g030173 Figure 5 1 Engine speed mode 4 Engine RPM 2 Safety interlock status indicators 5 Fuel level gauge 3 Engine temperature Engine Speed Mode Three modes are available LOW EFFICIENT and MAX LOW Low transport speed Low idle for reducing deck packing in wet mowing condition...

Page 7: ...ay the engine temperature When the temperature is high and approaching an overheat condition the bar graph will flash When the engine has overheated the bar graph will be completely filled Engine RPM Displays the RPM of the engine Fuel Level if fuel sender is available The fuel level is shown on a bar display An error appears when the fuel level is low approximately one gallon remaining in the tan...

Page 8: ...ion The user can scroll between the following screens in the Maintenance and Service menu 5 1 1 Status of Inputs 5 1 2 Status of Outputs 5 1 3 Current Error Messages 5 1 4 Hydraulic Transmission Oil Maintenance 5 1 5 Engine Oil Maintenance 5 1 6 Machine Information 5 1 7 RED Module Software and Hardware Version 5 1 1 Status of Inputs This screen lists all of the inputs to the system and highlights...

Page 9: ...tween screens if multiple errors are active If only one error occurs the toggle button will not change screens g030185 Figure 10 1 Current error 2 Error display e g Low oil pressure 3 Hour when it occurred 5 1 4 Hydraulic Transmission Oil Maintenance This service reminder screen displays the hours until the specified maintenance is due g030186 Figure 11 1 Hydraulic trans oil 2 Reminder display e g...

Page 10: ... 7 RED Module Software and Hardware Version The screen displays the current installed version of software and hardware for both the LDU Logic Display Unit and the MCU Master Control Unit Select the toggle button to see the MCU screen g030191 Figure 16 1 Module information 4 Software version 2 LDU 5 Toggle 3 Hardware version g030192 Figure 17 1 Module information 3 Hardware version 2 MCU 4 Software...

Page 11: ...ur meter and press the reset button to confirm the reset press Y yes or N no to cancel g030203 Figure 20 1 Reset 3 Y yes 2 Are you sure 4 N no 5 2 2 PTO Hour Counter This screen displays a non resettable total PTO hour counter and a resettable trip counter g030204 Figure 21 1 PTO hours 3 Trip hours 2 Non resettable total hours 4 Reset trip hours To reset the hour meter highlight the hour meter and...

Page 12: ... when Trip Statistics 1 is paused the statistics are highlighted and the reset button is available Pressing the reset button resets all three parameters Pressing the play button will start data collection g038364 Figure 25 1 Trip statistics 1 4 Displays gallons liters of fuel 2 Displays engine ON hours 5 Play Start 3 Displays PTO ON hours 6 Reset When one of the trip statistics is playing the stat...

Page 13: ...e Speed Command Output 5 3 7 Reset Options Back To The Factory Default Settings 5 3 1 Reset Engine Oil Maintenance Reminder The engine oil maintenance reminder screen allows the user to reset the number of hours until the engine oil service is due g030245 Figure 28 1 Engine oil 3 Remaining hours until service 2 Reminder display e g Maintenance hours to service 4 Reset Pressing the reset button bri...

Page 14: ...ssing the enter button brings the user to screens that allows the user to activate or deactivate the audible alarm for individual errors Note Not all audible alarms can be deactivated g030225 Figure 32 1 Alarms 3 Audible alert 2 Activate Deactivate 4 Enter Return The highlighted error name indicates that the audible alarm is active Pressing enter modifies the status of the audible alarm to ON or O...

Page 15: ...ded engine speed The enter button will be blacked out if the safe to start mode blades disengaged park brake engaged motion controls in neutral lock is not met Once the safe to start is met press the enter button to start the calibration process g030234 Figure 36 1 Calibrate engine settings 2 Start calibration An animated hourglass will appear indicating the calibration is in process g030235 Figur...

Page 16: ...mow mode engine speed 9 Auto Idle Down Mode If the operator leaves the seat and the safety interlocks allow the engine to remain running the system will enter the auto idle mode and automatically set the engine speed to the low transport speed When the operator returns to the seat the system will automatically return to the previously selected engine speed mode If the operator selects another engi...

Page 17: ... to the default Efficient Transport Mode speed and place the machine in Safe Transport Mode Safe Transport Mode limits the engine speed locks out the PTO and disengages the clutch a Clutch Overcurrent error message will display Cycling the key switch to OFF and then to the ON position will clear the fault 2 System Overvoltage 16VDC If the voltage exceeds 16 volts the system will disengage the clut...

Page 18: ... battery and engine charging system Contact an Authorized Service Dealer System Under voltage 9VDC Blink Red Disallow clutch engagement Disengage clutch System voltage below lower limit of 9 volts Check battery and engine charging system Contact an Authorized Service Dealer Clutch Overcurrent Blink Red RED limp mode engine limited to efficient and PTO disengaged Clutch current is above limit Cycle...

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