Curtis 1238SE - Page 57

4 — PROGRAMMABLE PARAMETERS
pg. 53
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
DRIVERS: PROPORTIONAL DRIVER MENU
PARAMETER ALLOWABLE
RANGE
DESCRIPTION
PD Enable PCF
|PD_Enable
|OptionBits1 [Bit 6]
0x306A 0x00
On / Off
On / Off
Determines how the PWM of the proportional driver is controlled.
When programmed On, it is controlled by the controller’s PD current control software. When
programmed Off, it is controlled by the VCL function Put_PWM (PWM5, value); see Figure
17, page 109.
Hyd Lower Enable
|Hyd_Lower_Enable
|OptionBits1 [Bit 7]
0x306A 0x00
On / Off
On / Off
When programmed On, lowering is controlled by throttle position.
When programmed Off, lowering is controlled by the VCL variable VCL_PD_Throttle; see
Figure 17, page 109.
PD Max Current
PD_Max_Current
0x3040 0x00
0.00 – 2.00 A
0 – 607
*The lift-lowering speed is determined by the aperture of the proportional valve. This
parameter sets the maximum allowed current through the valve, which in turn denes its
aperture.
PD Min Current
PD_Min_Current
0x3041 0x00
0.00 – 2.00 A
0 – 607
*Sets the minimum allowed current through the proportional valve. Most proportional
valves need a non-zero closed current in order to start opening immediately when Lower is
requested.
PD Dither %
PD_Dither_Percent
0x3042 0x00
0 – 100 %
0 – 32767
*Dither provides a constantly changing current in the coil to produce a rapid back-and-
forth motion of the valve; this keeps the valve lubricated and allows low-friction, precise
movement. The PD Dither % parameter species the amount of dither as a percentage of
the PD max current, and is applied in a continuous cycle of add%-subtract%.
PD Dither Period
PD_Dither_Period
0x3043 0x00
16 – 112 ms
1 – 7
*Sets the period for proportional valve dither.
PD Kp
PD_Kp
0x3044 0x00
1 – 100 %
82 – 8192
*Sets the proportional gain of the current feedback controller. Higher gains force the control
loop to respond quickly but may cause oscillations.
PD Ki
PD_Ki
0x3045 0x00
1 – 100 %
327 – 32767
*Sets the integral gain of the current feedback controller. Integral gain tries to force
the error to zero. Higher gains force the control loop to respond quickly but may cause
oscillations.
* These parameter descriptions assume the proportional driver
is being used to drive a proportional valve, and that the PD
current control software is active (PD_Enable = On).
DRIVERS: DRIVER 3 MENU
PARAMETER ALLOWABLE RANGE DESCRIPTION
Contactor Enable
|Hydraulic_Contactor_Enable
|OptionBits4 [Bit 1]
0x306D 0x00
On / Off
On / Off
When programmed On, VCL functions control Driver 3 as the hydraulic pump
contactor.
On: The VCL function Start_Pump() will close the pump contactor according to the
dened pull-in and holding voltages. The VCL function Stop_Pump() will open
the pump contactor.
Off: Driver 3 will be available for general VCL usage. Start_Pump() and Stop_
Pump() will not have any effect.
Pull In Voltage
Driver3_Pull_In_Voltage
0x3864 0x00
0 – 100%
0 – 32767
The pull-in voltage parameter allows a high initial voltage when the contactor
driver rst turns on, to ensure contactor closure. After 1 second, this peak voltage
drops to the contactor holding voltage.
NOTE: This voltage will be battery voltage compensated.
Holding Voltage
Driver3_Holding_Voltage
0x3865 0x00
0 – 100%
0 – 32767
The holding voltage parameter allows a reduced average voltage to be applied to
the contactor coil once it has closed. This parameter must be set high enough to
hold the contactor closed under all shock and vibration conditions the vehicle will
be subjected to.
NOTE: This voltage will be battery voltage compensated.