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- FORM NO. 56043058 Hydro-Retriever™ 3800 / 2042 / BR 1100
WHEEL DRIVE SYSTEM
GENERAL FUNCTIONAL OVERVIEW
A 2.7 HP separately excited (field & armature) 36V DC motor/gear/wheel unit (M6) is used to propel the machine. A Curtis model 1243 PMC solid
state speed controller (A1) regulates (outputs) the variable speed Fwd/Rev wheel drive motor functions. The controller unit is located to the left
of the operator seat, behind the electrical access panel. The electronic throttle A2 mounted to the operator foot pedal inputs to the (A1) controller
the machine operator’s specific speed and direction demands.
DRIVE MOTOR SYSTEM CONTROLLER FUNCTION OVERVIEW
See Figure 1. To make the A1 speed controller’s internal circuits operational (power it up) the two switches S1, main power and S2 charger interlock
must be closed. Next the seat switch S3 must be depressed for the main contactor K1 to be energized. Depressing the foot pedal in either Fwd
or Rev will move the electronic throttle A2 and provide the needed direction and 0-5V throttle input signals for controller output. These controller
inputs direction and voltage then energize the internal transistors which selects the motor polarity and also at the same time manages the current
and voltage output values to the two separate motor circuits (armature & field) per the percentage of the A2 throttle movement.
MOTOR OPERATION
The motor has (4) terminal connections, (2) armature A1, A2 and (2) field D1, D2. The motor armature circuit receives from the controller a chopped
on time off time *PWM voltage and current output that varies the motor speed. The field circuit sees the current direction polarity change that effects
the rotation of the motor CW for FWD and CCW for REV.
DRIVE WHEEL SYSTEM SPEEDS
The speed controller is programmed for two maximum speed setting modes, M1max and M2max. The M1max is the transport speed mode and
is set at 100% of the total systems speed potential. The M2max is the scrubbing speed mode and is set a 92% of the total system’s speed potential.
Note:
Both of the speed settings (M1 & M2) can be changed (increased or decreased) from the original factory specifications only by using the
hand held programmer PN 56409441. See in the electrical system section of this manual instructions for using the programmer for speed setting
changes and troubleshooting diagnostics.
*PWM; pulse width modulation, also called “chopping” is a technique that switches battery voltage to the motor ON and OFF very quickly, thereby
controlling the speed of the motor.
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
AUXILIARY
DRIVER
FAULT
1
THROTTLE
CONTROL
MAIN CONTACTOR
DRIVER
MODE
SELECT 1
INTERLOCK
REVERSE
Detail of A1 16-pin connector:
Used (9 Pins)
Not Used (7 Pins)
FORWARD
KEY SWITCH
INPUT (KSI)
revised 12/02
