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Operation and Adjustments
The VMAC digital throttle is a "slow ramp" throttle. Each time the
system is powered on, it will quickly increase engine speed to
1,500 rpm; then increase to maximum VMAC rpm over 8 seconds
(provided the system has not reached full system pressure before
maximum VMAC rpm is reached).
After the initial slow ramp, the throttle will respond normally to air
demand.
The throttle control is configured at the factory for optimum performance at
maximum cfm. In applications where maximum cfm is not required, or noise is a
concern, the throttle control can be adjusted to reduce the maximum VMAC rpm.
Safety features
The throttle control has built in safety features that will disable the system if an
unsafe condition is detected, or either of the lock out parameters is not met (the
vehicle must be in "PARK" and the park brake must be engaged).
If an unsafe condition is detected, the "STATUS" LED will turn off, and engine speed
will return to idle. Once all unsafe conditions have been removed, the system must
be cycled off, then on again to reset it. Once the system powers up, the "STATUS"
LED will illuminate, and the system will operate normally.
If the park brake is released, or the vehicle is placed in gear, the
"STATUS" LED and the corresponding lockout LED will turn off and
the throttle control will deactivate. This will reduce engine speed to
base idle.
In order to activate the system again, re-engage the appropriate
lockout and cycle the VMAC "OFF" then "ON" via the control box.
VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
Digital Throttle Control
Figure 48 — Throttle control
47
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