Proportional Driver Menu - Curtis 1298 User Manual

3 — PROGRAMMABLE PARAMETERS:
ALLOWABLE
PARAMETER
PD Enable
PD_Enable
OptionBits1 [Bit 6]
Hyd Lower Enable
Hyd_Lower_Enable
OptionBits1 [Bit 7]
PD Max Current 0.0–2.0 A
PD_Max_Current
PD Min Current
0.0–2.0 A
PD_Min_Current
PD Dither % 0–100 %
PD_Dither_Percent
PD Dither Period 16–112 msec
PD_Dither_Period
PD Kp 1–100 %
PD_Kp
PD Ki 1–100 %
PD_Ki 327–32767
*
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).
46
Proportional Driver Parameters

PROPORTIONAL DRIVER MENU

RANGE
On/Off Determines how the PWM of the proportional driver is controlled.
On/Off 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 20, page 100.
On/Off When programmed On, lowering is controlled by throttle position.
On/Off When programmed Off, lowering is controlled by the VCL variable VCL_PD_
Throttle; see Figure 20, page 100.
The Lower speed is determined by the aperture of the proportional valve.
*
0–607 This parameter sets the maximum allowed current through the valve,
which in turn defines its aperture.
Sets the minimum allowed current through the proportional valve.
*
0–607 Most proportional valves need a non-zero closed current in order to start
opening immediately when Lower is requested.
Dither provides a constantly changing current in the coil to produce a rapid
*
0–32767 back-and-forth motion of the valve; this keeps the valve lubricated and allows
low-friction, precise movement. The PD Dither % parameter specifies the
amount of dither as a percentage of the PD max current, and is applied in
a continuous cycle of add%-subtract%.
Sets the period for proportional valve dither.
*
1–7
Sets the proportional gain of the current feedback controller. Higher gains
*
82–8192 force the control loop to respond quickly but may cause oscillations.
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.
DESCRIPTION
Curtis 1298 Manual,
11
OS