Hydraulics Parameters; In Configuration B, The 1230 Controls; In Configuration C, The 1230 Controls - Curtis Instruments MultiMode 1230 Manual

3 — PROGRAMMABLE PARAMETERS:

In Configuration B, the 1230 controls:

• the contactor that turns the pump motor on/off, and
• the position of the lowering valve (open/closed).
Check
Valve
Pump
Hydraulic
Motor
Pump
Fig. 17
Simple hydraulic system (standard wiring configuration B).

In Configuration C, the 1230 controls:

• the contactor that turns the pump motor on/off,
• the aperture of the proportional valve, and
• the position of the load-hold valve (open/closed).
Check
Valve
Pump
Hydraulic
Motor
Pump
Fig. 18 Hydraulic system with Lift and Lower proportional valve (standard wiring configuration C).
40

Hydraulics Parameters

HYDRAULICS PARAMETERS
In standard wiring configuration A (page 8), the 1230 provides a feed-through
for hydraulics control signals, but otherwise has no relationship to the hydrau-
lics system.
In standard wiring configuration B (page 10), the 1230 turns the pump
motor on and off, and opens and shuts the lowering valve; see Figure 17. For
these simple systems (Auxiliary Output Type 1, see page 43), only a few of the
programmable hydraulics parameters apply.
Pressure
Relief
Valve
During Lift, the pump motor drives the pump, which forces hydraulic fluid up
the hoses and into the Lift cylinder. When the Lift is completed, the check valves
trap the fluid in the Lift cylinder.
During Lower, the lowering valve opens and gravity returns the fluid to the
reservoir. When the Lower is completed, the lowering valve closes and this
check valve plus the check valve at the pump keep the hydraulic fluid in place.
In standard wiring configuration C (page 12), the 1230 extends its control
to the acceleration rate and speed of Lift/Lower operation; see Figure 18. All
the hydraulics parameters—including the proportional valve, load hold valve,
and hydraulic throttle parameters—apply.
The Auxiliary Output Type parameter (page 43) must be set to 4.
Pressure
Relief
Valve
During Lift, the pump 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. The speed of the Lift is determined
by the amount of fluid that is diverted through the proportional valve.
During Lower, the load-hold valve and the proportional valve open, and gravity
returns the fluid to the reservoir.
Cylinder
Lowering
Valve
Lift
Cylinder
Load
Hold
Proportional
Valve
Valve
Curtis 1230 Manual,
Lift
Rev. C