Curtis PMC 1297 Manual
46
B. HYDRAULIC PARAMETERS
The various hydraulic parameters adjust the hydraulic system’s operating character-
istics—its acceleration, speed, and responsiveness. These parameters allow the hy-
draulic system to be tailored to a specific application, or to a specific operator’s
preferences.
The 1297 controls the speed of the pump motor, and also the valves on the Lift
cylinder’s hydraulic line. By so doing, it controls the hydraulic path for Lift and
Lower operations. The hydraulic path for any other hydraulic operations—e.g.,
reach, tilt, sideshift, rotate—is provided by the vehicle manufacturer, with the 1297
controlling the pump motor speed but not the hydraulic path itself.
PUMP C/L
The
pump current limit
parameter defines the maximum pump motor arma-
ture current. The pump current limit is adjustable from 25 amps up to the
controller’s full rated pump motor current. (The full rated pump current
depends on the controller model; see specifications in Table E-1.)
PUMP MAX SPEED
When the Lift switch is closed, the controller activates the load-hold valve, thus
enabling the Lift function—as shown in Figure 20. The
maximum pump speed
parameter defines the maximum allowed armature PWM output during Lift
operations. The maximum pump speed parameter is adjustable from 0% to
100% of full output.
The maximum pump speed is tuned as part of the vehicle performance
adjustment process (Section 5).
NO LOAD C/L
The
no load pump current limit
parameter sets the current that will define the
“no load” state. When the pump current is below this ceiling, the pump is
considered to have no load, and the no load maximum pump speed will apply.
If a separate maximum speed is not desired for unloaded situations, the no load
pump current limit can be set at the same value as the regular pump current
limit. The no load pump current limit can be adjusted from 0 amps up to the
programmed pump current limit.
NO LOAD SPEED
The
no load maximum pump speed
parameter allows a higher maximum
pump speed to be in effect when the pump motor is operating below the set “no
load” current limit. The no load maximum pump speed parameter has the same
3
B
— PROGRAMMABLE HYDRAULIC PARAMETERS: Pump
Pump Parameters
