Curtis 1298 - Page 58

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Curtis 1298 Manual, OS 11
3 — PROGRAMMABLE PARAMETERS: Hydraulic Parameters
Lower Deadband 0–5.00 V Defines the wiper voltage at the hydraulic throttle deadband threshold.
Lower_Deadband 0–32767 Increasing the hydraulic throttle deadband setting will increase the neu
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tral range.
This parameter is especially useful with throttle assemblies that do
not reliably return to a well-defined neutral point, because it allows the
deadband to be defined wide enough to ensure that the controller goes
into neutral when the throttle mechanism is released.
Lower Map
10–100% Modifies the proportional valve driver’s response to the hydraulic throttle
Lower_Map 3276–32767 input. Setting the lower map at 50% provides linear output response to
hydraulic throttle position. Values below 50% reduce the driver’s output at
low hydraulic throttle settings, thus providing enhanced low-speed control
of the proportional valve. Values above 50% give the proportional valve a
faster, more responsive feel at low throttle positions.
The map value is the percentage of controller output at half throttle
((deadband + max) / 2).
Lower Max
0–5.00 V Defines the wiper voltage required to produce 100% proportional valve
Lower_Max 0–32767 driver current. Decreasing the lower max setting reduces the wiper
voltage and therefore the full stroke necessary to produce full driver
current. This parameter allows reduced-range throttle assemblies to be
accommodated.
Lower Offset
0–100% Defines the initial proportional valve driver current generated when the
Lower_Offset 0–32767 hydraulic throttle is first rotated out of the neutral deadband. For most
hydraulic systems, a setting of zero is appropriate. For some hydraulic
systems, however, increasing the offset may improve controllability by
reducing the amount of throttle required to open the proportional valve.
VCL Hyd Throttle Enable
On/Off When programmed On, this parameter provides a VCL alternative to
VCL_Hyd_Throttle_Enable On/Off Throttle Type 5, allowing you instead to select Hyd Throttle Types 1–4,
VCL_Hyd_Throttle_Enable_ which have automatic throttle fault protection.
Bit0 [Bit 0] As shown in the hydraulic command chain (Figure 19, page 97),
enabling this parameter breaks the chain—with the first part providing
normal throttle pot processing (with throttle fault protection), and the
second part under the control of VCL.
However, in order to “combine the best of both worlds,” you must write
VCL code to define the connection between the OS_Hyd_Throttle and
VCL_Hyd_Throttle variables.
This combination allows VCL flexibility and customization of hydraulic
throttle processing, while still allowing hydraulic types 1–4 with their
automatic throttle fault detection.
HYDRAULIC THROTTLE MENU, cont’d
ALLOWABLE
PARAMETER RANGE DESCRIPTION