OPERATING CONTROLS AND PROCEDURES GRT880 OPERATOR MANUAL
3-54 Published 3-25-2020, Control # 643-04
ECO mode is forced to inactive when the crane's
transmission is being shifted to Forward or Reverse, or all
crane functions are disabled.
When active, ECO mode will ramp the throttle percent from 0
to setpoint when any crane function command goes above
5% command. Once ECO mode’s output is at the setpoint,
the output will stay at the setpoint until no crane functions are
being commanded for 3 seconds. Then the ECO mode's
throttle command is to be set to 0% (step down).
NOTE: Ramp time for increasing throttle percent is
2 seconds from 0% to 100% throttle (slope = 50%
per second).
Operation
• Crane is able to idle at 700 RPM when crane functions
are not enabled.
• Crane idles at 900 RPM when any crane function has
been enabled.
• New feature added to Operating Display menu that
allows user to turn on “ECO Mode” and set the operating
RPM for the crane.
• When user turns ECO mode ON:
- Crane ramps engine from idle to operating RPM
using the first 15% of the joystick movement to
control the ramp.
- Crane maintains operating RPM while crane
functions are active and for a period of 3 seconds
after crane functions go inactive.
- Crane ramps engine speed back down to idle point.
Benefits
• Less noise and less fuel consumption versus
maintaining crane at fixed “operating RPM”.
• Set point for engine operating speed is easily changed
by the user.
• User can command additional engine speed at any time
using the accelerator pedal.
• Lower idle speed is better for “creep speed” driving, and
improves braking performance.
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