BASIC OPERATION AND FEATURES
SX TRANSISTOR CONTROL
Page
9
October 2002
112). This feature allows the operator to select the best
vehicle performance for changing factory (task) conditions.
Section 2.3.7 Circuit Board Coil Driver Modules
Coil drivers are internal to the control card, and are the
power devices that operate the Line and 1A contactor coils.
On command from the control card, these drivers initiate
opening and closing the contactor coils. All driver modules
are equipped with reverse battery protection, such that, if
the battery is connected incorrectly, the contactors can not
be closed electrically.
Section 2.3.8 Truck Management Module (TMM)
The Truck Management Module is a multifunction
accessory card, or an integral function of the GE Pump
controls when used with the SX Traction control. The
Module provides the OEM the ability to initiate status codes
or operator warning codes to be displayed on the Dash
Display, whenever a normally open switch or sensor wire
provides a signal to the Module.
The TMM Module can be used to display a separate status
code indicating over-temperature of traction motors,
hydraulic motors, or any other device or system that can
activate a switch that closes.
The TMM Module can also be used as a Brush Wear
Indicator (BWI). The Brush Wear Indicator is designed to
detect a "worn out brush" and display a fault code on the
Dash Display to warn maintenance personnel that the
motor brushes need to be replaced before they wear to the
point of causing destructive damage to the motor
commutator surface.
Section 2.4 Hydraulic Pump Control
This hydraulic motor controller consists of the following
features:
·
Three speeds, adjustable from O to 100% motor
volts. Fixed speeds actuated by switch closure to
negative.
·
Current limit and controlled acceleration adjustable.
·
Battery Discharge Indicator interrupt compatible.
·
Coil driver module designed to operate the line
contactor (see Section 2.3.7).
Operation of voltage regulator card: This card provides the
basic functions required for controlling the pump control,
optional contactors, and PMT functions. Battery positive is
applied through a main control fuse to the key switch,
energizing the control card power supply input to P1.
When a pump contactor is used, PMT operation is the
same as outlined for the traction controllers.
The three speed (motor volts) reference points P12, P19,
and P20 are selected by connecting these points
independently to battery negative.
The first speed is obtained by closing Speed Limit I (P12) to
control negative. SLl is adjustable by Function 11 using the
Handset to adjust motor voltage from O to 100%. The
specified motor volts will be regulated, however, the
magnitude of motor current will vary depending on the
loading of the vehicle.
The second speed is obtained by closing SL2 (P19) to
control negative. SL2 is adjusted using the Handset and
Function 12 similar to SL1.
The third speed is obtained by closing SL3 (P20) to control
negative. SL3 is adjusted using the Handset and Function
13 similar to SL1.
If more than one Speed Limit is activated, the selected
speed with the highest motor volts will override the low
motor volt speed. The current limit circuit is adjustable and
operates the same as the traction current limit.
The controlled acceleration circuit is adjustable and
operates the same as the traction circuit. Adjustment range
is from 0.1 to 5.5 seconds.
The Battery Discharge Indicator (BDI) interrupt will disable
the hydraulic controller if the connection at P10 loses the
12 volt signal from the traction control. BDI interrupt can be
disabled by Function 17 using the Handset. Select card type
with or without BDI function.
