Mack V-MAC IV, Operator'S Handbook Manual

Page: 63 / 133

V-MAC Co-Pilot Operator's Manual 55
Variable Speed Control (VSC)
To use the variable speed control functions, the following conditions must be met:
1 The clutch must be engaged.
2 The park brake must be set.
To activate VSC, move the Speed Control switch to the ON position. Increase engine
RPM using the accelerator pedal (AP). At the desired engine speed (RPM), press and
release the SET switch. This speed setting will be maintained.
To increase the RPM, press and hold the ACCEL switch until the desired speed is
attained. Or, press the accelerator pedal until the desired speed is attained and then
press and release the SET switch.
To decrease engine RPM, press and hold the DECEL switch until the desired speed
is reached and then release the switch.
RPM can also be “bumped” up or down. Tap the ACCEL side to increase RPM, or
the DECEL side to decrease RPM by the customer-programmed amount (default
setting is 50 RPM).
VSC can also be programmed for Auto Set mode. When enabled, simply move the
Speed Control switch to the ON position and activate a customer-defined switch
(usually setting the parking brake). The RPM will go to the preprogrammed minimum
speed.
The “ramp rate” for EHT, and for each PTO in PTO control, can be programmed
to increase and decrease in speed to a customer-specified speed by using the
ACCEL/DECEL switch.
Disengaging SSC or VSC Functions
To disengage the speed control settings, use any one of the following methods:
•
Move the Speed Control switch to the OFF position.
•
Disengage the clutch.
•
Apply the service brakes.
•
Release the parking brake.
Note:
When the PTO is engaged on vehicles equipped with SSC, the SSC will take
precedence over the VSC.
Note:
To reactivate the VSC to the previously set speed, press and release the
RESUME switch. If the Speed Control ON/OFF switch is used to disengage the
VSC, a new speed must beset. The RESUME switch will work only if the VSC was
disengaged by using the clutch or service brake.
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