Pump Acceleration Rate; Pump Deceleration Rate; Fig. 20 Hydraulic System Diagram - Curtis 1297 Manual

The 1297 controls:
• the speed of the pump motor
(which regulates how quickly the hydraulic fluid can push up the Lift cylinder),
• the position of the load-hold valve (open/closed), and
• the aperture of the proportional lowering valve
(which regulates how quickly the hydraulic fluid can drain from the Lift cylinder).
Check
Valve
Pump
Hydraulic
Motor
Pump
Hydraulic system diagram.
Fig. 20
Curtis PMC 1297 Manual
Pressure
Relief
Valve
During Lift, the pump motor drives the pump, which forces hydraulic
fluid up the hoses, through the open load-hold valve, and into the Lift cylinder.
When the Lift is completed, the load-hold valve closes, trapping the fluid
in the Lift cylinder.
During Lower, the load-hold valve and the proportional lowering valve open,
and gravity returns the fluid to the reservoir.
adjustment range as the regular maximum pump speed parameter (0–100% full
PWM output). If separate loaded and unloaded maximum speeds are not
desired, this parameter can be set to the same value as the regular maximum
pump speed parameter.
PUMP ACCEL
The pump acceleration rate parameter defines the time it takes for the
controller to accelerate from 0% output to 100% output to the pump motor
when Lift is requested with full hydraulic throttle. A larger value represents a
longer acceleration time and a gentler start to the Lift operation. The pump accel
rate is adjustable from 0.1 to 3.0 seconds.
PUMP DECEL
The pump deceleration rate parameter defines the time it takes for the
controller to decelerate from 100% output to 0% output to the pump motor
when the hydraulic throttle is reduced from full to none, or when the Lift switch
is opened. The pump decel rate is adjustable from 0.1 to 3.0 seconds.
3 — PROGRAMMABLE HYDRAULIC PARAMETERS: Pump
B
Proportional
Lowering
Valve
Lift
Cylinder
Load
Hold
Valve
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