OPERATOR’S MANUAL
MAINTAINING CALIBRATION ACCURACY
Calibration accuracy can be affected by various conditions and to retain
optimum performance a system calibration should be performed for the
following conditions:
•
If a new material is added and the spreader, nozzle, or flow meter
constant is not accurately known, perform a granular or liquid
calibration routine.
•
If wear of the conveyor/auger mechanism, actuator valves, flow meter,
nozzles, or other system components is suspected, perform a new
catch test (granular or liquid calibration) to re-establish APR accuracy.
•
Perform a ground speed calibration after installing new or different
tires.
•
Each known physical (mechanical) change in the system should be
followed immediately by a system response calibration on the related
control channel (granular, liquid pre-wet, liquid anti-ice, or spinner).
•
A periodic system recalibration when repair or replacement has
occurred on any system components, including hydraulic hoses, fluid
changes, and normal wear.
•
A yearly system calibration of all control channels at the beginning of
each spreader season.
SYSTEM RESPONSE ADJUSTMENTS
Adjustments after a system calibration can be made so the system
responds faster or slower than calculated by the automatic calibration
routines.
Automatic calibration routines should always be performed prior
to modification to establish basic values.
System performance can be improved by adjusting the following functions:
SYSTEM RESPONSE CONSTANT
•
Control system responds slowly in speed and is slow to start
–
Increase the system response value
•
System oscillates around the target APR
–
Decrease the system response value
Excessive oscillation should be limited to +/-5% of the target APR to
minimize wear on the PWM valve. Most systems can be tuned by altering
only this value.
VALVE BOOST
Valve Boost increases system response only at startup to quickly start
system spreading. The value does not affect stability when operating at the
target APR and does not normally require adjustment.
Flex4 Pro
TM
Control System
6010541 Rev A
CALIBRATIONS / 105
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