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BASIC OPERATION AND FEATURES
SX TRANSISTOR CONTROL Page 10
January 2000
•= 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.
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.