• Instrument cluster - for displaying mes-
sages on the fault code display or turning
ON/OFF warning lights. See Fault Codes.
• Engine Control Module - for the Anti-
Stall, Automatic Throttle-Up, Hibernate
Idle, and Temperature Protection features.
See Programmed Features.
• Transmission Controller - for Vehicle
Speed, Traction Speed Limiter - Loaded,
Traction Speed Limiter - Container Position,
and Adjustable Loaded Vehicle Speed Reduc-
tion. See Programmed Features.
• Hydraulic Controllers - for communication
between both controllers.
OUTPUT SIGNALS
Output signals can be digital (ON/OFF), analog
(with a certain value and within a specified range),
or CAN bus messages. Depending on settings and
programmed features, output signals can be differ-
ent than standard programming. See Settings and
Programmed Features.
Analog Outputs
Analog signals for proportional hydraulic functions
are voltage-controlled PWM (Pulse Width Modula-
tion) outputs and operate within a nominal range of
±8% to ±50% of the truck's supply voltage.
There is a separate proportional control valve for
the following functions:
• Lower - Lift A
• Lift - Lift B1, Lift B2
• Tilt Forward - Tilt A
• Tilt Backward - Tilt B
• Aux - Aux A, Aux B
• Fan Drive - Fan Drive System
The letters A and B correspond to the flow direction
as intended by the lever/switch movement.
For lifting, lowering, and both tilt functions, there
are separate control valves to control movement
and direction.
The auxiliary functions use a separate digital
ON/OFF valve, in addition to the two proportional
control valves that determine flow direction, to ena-
ble/disable the hydraulic function.
The hydraulic fan drive system also uses a propor-
tional control valve to control the cooling fan speed/
cooling performance, which is dependent on four
temperature inputs:
• Engine Coolant Temperature
• Engine Charged Air Temperature
• Transmission Temperature
• Hydraulic Oil Temperature
The output for the fan drive system is a voltage-
controlled PWM (Pulse Width Modulation) signal.
Depending on the inputs, the current will vary be-
tween 250mA and 600mA. The fan speed/cooling
performance is higher when the current drops and
vice versa. See Programmed Features.
Digital Outputs
Digital signals are ON/OFF signals providing ±24
volts (System Voltage) when active (activated) and
0 volts when inactive (deactivated). In general, digi-
tal signals are used for auxiliary functions.
The following outputs are available for auxiliary
functions:
• Digital Out Aux_0 - Power Pile Slope (G117)/
Side Shift (B917)
• Digital Out Aux_1 - Rotation
• Digital Out Aux_2 - Twist locks
• Digital Out Aux_3 - Hydraulic Stop Lock
• Digital Out Aux_3 - Hydraulic Stop Unlock
• Digital Out Aux_4 - Side Shift (G117 only)
• Digital Out Aux_5 - Extend/Retract
• Digital Out Aux_6 - Reach
Lowering Interrupt
Digital output Pin 33 (Lowering Interrupt – Blue
Light Twist Module) of the cab controller is used to
provide input to the Twist module. The Lowering
interrupt is activated when the input signal “Low-
ering interrupt” of the frame controller is active
and the “function override” input is NOT active.
1900 SRM 1561
Description
5
