3 — PROGRAMMABLE PARAMETERS
pg. 59
Curtis Model 1351 – December 2018
PARAMETER
ALLOWABLE RANGE
DEFAULT
DESCRIPTION
Current Control
This menu is Context Enabled: Visible only when
Control Mode = Current Cntrl
Max Current
Driver_X_Max_Current
Parameter’s CAN Index by
Driver_X_Max_Current
5 = 0x3114 0x00
6 = 0x3115 0x00
7 = 0x3116 0x00
8 = 0x3117 0x00
9 = 0x3118 0x00
10 = 0x3119 0x00
0 – 3000 mA
0 – 3000
0 mA
0
Maximum current that the 100% command will effectuate.
X= 5 – 10 for the VCL name
Driver_X_Max_Current
Reference the
Driver_X_Command
.
Min Current
Driver_X_Min_Current
Parameter’s CAN Index by
Driver_X_Min_Current
5 = 0x3124 0x00
6 = 0x3125 0x00
7 = 0x3126 0x00
8 = 0x3127 0x00
9 = 0x3128 0x00
10 = 0x3129 0x00
0 – 3000 mA
0 – 3000
0 mA
0
Minimum current that a 0.1% command will effectuate. (a value
of .05 will turn off the driver).
X= 5 – 10 for the VCL name
Driver_X_Min_Current
Reference the
Driver_X_Command.
Dither Period
Driver_X_Dither_Period
Parameter’s CAN Index by
Driver_X_Dither_Period
5 = 0x3184 0x00
6 = 0x3185 0x00
7 = 0x3186 0x00
8 = 0x3187 0x00
9 = 0x3188 0x00
10 = 0x3189 0x00
2 – 1000 ms
2 – 1000
1000 ms
1000
Periodicity (frequency) of the applied dither.
X= 5 – 10 for the VCL name
Driver_X_Dither_Period
Dither provides a small amount of cyclically changing current
to vibrate the solenoid and thus keep it from “sticking” in one
position. Without dither, it is harder to make small adjustment in
the proportional valve position. Dither has both a frequency and
amount.
Dither Amount
Driver_X_Dither_Amount
Parameter’s CAN Index by
Driver_X_Dither_Amount
5 = 0x3174 0x00
6 = 0x3175 0x00
7 = 0x3176 0x00
8 = 0x3177 0x00
9 = 0x3178 0x00
10 = 0x3179 0x00
0 – 100 %
0 – 32767
0 %
0
The percent of the Driver_X_Max_Current parameter that which
is applied above and below its set point.
X= 5 – 10 for the VCL name
Driver_X_Dither_Amount
Note, the driver measures current just before the PWM is shut off,
therefore there is a lower limit where the current cannot be read.
For the low side drivers, this is 8% (for HB drivers in low-side
mode, this is 12%). The system designer should make sure that
the load resistance, the coil return voltage supply, and minimum
current will remain valid keeping the driver PWM above these
values for good regulation.
0% disables the dither function.
OUTPUTS — PWM DRIVERS, cont’d