18
MicroController Control System
System Operation
Display = “Ec” Pump Controller Over Temperature
The pump logic monitors the temperature of the pump
controller. If the controller overheat(85°C), the logic
will slow lifting speeds and “Ec” will appear on the LCD
with symbol.
Display = “Ed” Drive Motor Over Temperature
The drive logic monitors the temperature of the drive
motor. If the drive motor overheat(150°C), the logic
will reduce drive speed & acceleration and “Ed” will
appear on the LCD with symbol.
Display = “Ep” Pump Motor Over Temperature
The pump logic monitors the temperature of the pump
motor. If the pump motor overheat(150°C), the logic
will reduce lifting speed and “Ep” will appear on the
LCD with symbol.
Display = “A” Head Capacitor
The head capacitor ensures that a steady voltage is
maintained to the positive heatsink and that large
voltage spikes are filtered out. The logics monitors
this. If the logics detects that the head capacitor has
failed, an “A” will be displayed and truck
performance will be reduced.
Display = “EL” Battery Lock-out
When the battery is discharged, the CVMS displays
“EL” and pump motor will not operate. If key switch
turn off and then on, pump will operate for only 5
seconds. Drive motor speed will not exceed 70% of
the max. regardless of an accelerator’s output voltage.
Display = “F” Logic Board Failure
The logics can detect some internal crcuit failures.
When a failure is detected an “F” will appear on the
display.
Display = “F0-F7”, “FA”, “Fb”, “Fc”, “FF”, “FL”
Failure Protection Circuits
The Failure Protection Circuit guards against a
condition which could cause the operator to lose
control of the lift truck. If one of the failure protection
circuits is activated, the display will appear the letter “F”
and a number. The logics will prevent normal
operation of the lift truck.
Display = “F0” Overcurrent in Drive System
The logics monitors the drive motor current via the
shunt and compares the amount of current measured
to the current levels set on logic. If current exceeds
these levels for longer than a preset time. the logics
will shutdown, and an “F0” will appear on the display.
Display = “F1” Accelerator Problem
The logics monitors the output voltage from the
accelerator. If these signals do not appear the “F1”
will appear on the display and the truck will shutdown.
Display = “F2” Drive Armature Circuit Failure
The logic monitors the voltage at S2 terminal(VMS) of
Drive system and Drive Armature current through
Shunt in controller. If the voltage is abnormal or the
current is too high, the logic will deactivate the Regen
contactor and an “F2” will appear on display.
Display = “F3” Pump System Failure
The logic monitors the voltage at P2 terminal of
Pump system and Pump current through Shunt in
controller. If the voltage is abnormal or the current is
too high, the logic will deactivate the Regen contactor
and an “F3” will appear on display.
Display = “F4” Drive & Pump System Failure
If the failures occur on both “F2” and “F3”, the
logic will deactivate the Regen contactor and an “F4”
will appear on display.
Display = “F5” Drive Armature Circuit Failure
The logic monitors the Drive Armature current
through Shunt in controller. If the current is zero, the
logic will deactivate the Regen contactor and an “F5”
will appear on display.
Display = “F6” Pump System Failure
The logic monitors the Pump current through Shunt in
controller. If the current is zero, the logic will deactivate
the Regen contactor and an “F6” will appear on display.
Display = “F7” Drive & Pump System Failure
If the failures occur on both “F5” and “F6”, the
logic will deactivate the Regen contactor and an “F7”
will appear on display.
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