High Country Tek PLD, Powerline / universal single / dual coil PWM Valve Driver - Manual (Page 20)

Part No:- 021-00155 RevD7 PowerLine System Controller User Guide Page | 20
PowerLine User Guide
MAX
MIN
Stop RPM Slow RPM
Output
Current[A]
Horse Power Limiter & Anti-Stall Mode
NOTE: It is strongly reccomended that the user cycles power to the PowerLine module after saving any
program changes to ensure that the setting alterations take place and any old setting data is erased by
the controller.
Selection from Menu -> Control Logic -> Anti-Stall – Single Coil Operation
The PowerLine will adjust its outputs as a
function of the RPM of a device. Anti-stall,
or load limiting, progressively de-couples
the load as RPM decreases to avoid
stalling the prime mover ( electric motor or
engine ). This method is typically used in
situations where the throttle of the engine
is controlled by the operator and the load
changes independently such as a
propulsion circuit. The Anti-Stall action is
used to prevent a sudden increase in load
from causing the engine to stall before the
operator has a chance to increase the
throttle or decrease the load, or to
automatically adjust the load without
operator intervention.
When the prime mover RPM is less than
the STOP RPM setting, the PowerLine
outputs MIN current and the load will be completely removed. When the RPM is more than the SLOW RPM, the
PowerLine will output Max current. Setting the MAX current value too high can delay the start of load de-
coupling until an RPM less than the SLOW RPM set point has been reached.
The separation between the SLOW RPM and
STOP RPM determines how aggressively the
load is reduced. This algorithm can be used as
a continuously variable transmission controller
when connected to a variable displacement
pump or motor. Ramps are provided to tune the
response time (PID constants do not affect this
process). This algorithm can cause oscillations if
the ramp times are too short in some systems.
Ramps are easy to tune as there is only one
number to adjust per ramp and there are only
four independently tunable ramps. The ramps
are simply increased from zero until the
oscillation (if any) stops or the desired
smoothness is achieved. Because the ramp
settings are independent, the rate of reducing
the load can be set differently than the rate for
re-applying the load.
Figure 2 Coil Current vs. Demand in
Anti Stall Mode
Single Coil Operation