3 — PROGRAMMABLE PARAMETERS
Curtis Model 1351 – December 2018
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pg. 64
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Dither Amount
Driver_X_Dither_Amount
Parameter’s CAN Index by
Driver_X_Dither_Amount
11 = 0x317A 0x00
12 = 0x317B 0x00
0 – 100 %
0 – 32767
0 %
0
The percent of the HB Driver’s Driver_X_Max_Current parameter
that is applied above and below its set point.
X= 11 or 12 for the VCL name Driver_X_Dither_Amount
Note that 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.
Kp
Driver_X_Kp
Parameter’s CAN Index by
Driver_X_Kp
11 = 0x319A 0x00
12 = 0x319B 0x00
1 – 100 %
20 – 2048
8 %
163
The proportional section of the PI (Proportional/Integral) current
regulator within the 1351 system controller.
X= 11 or 12 for the VCL name Driver_X_Kp
Therefore, this parameter determines how aggressively the PI
controller attempts to match the driver current command. Larger
values provide tighter control.
If the gain is set too high, oscillations can occur as the controller
tries to control the Driver current. If it is set too low, the Driver
current may behave sluggishly and be difcult to control.
Ki
Driver_11_Ki
Parameter’s CAN Index by
Driver_X_Ki
11 = 0x31AA 0x00
12 = 0x31AB 0x00
1 – 100 %
20 – 2048
8 %
163
Integral section of the PI (Proportional/Integral) current regulator
(controller).
X= 11 or 12 for the VCL name Driver_X_Ki
The integral term (Ki) forces zero steady state error so the Driver
will run at exactly the commanded current in conjunction with the
Kp parameter (above). Larger values provide tighter control.
If the gain is set too high, oscillations can occur as the controller
tries to control the Driver current. If it is set too low, the Driver
may take a long time to approach the exact commanded current.
Test
Command
Driver_X_Command
Parameter’s CAN Index by
Driver_X_Command
11 = 0x336A 0x00
12 = 0x336B 0x00
0.0 – 100.0 %
0 – 1000
0 The HB Driver command. It corresponds to the driver’s control
mode type setting. This is the steady-state command, similar to
the traditional contactor “holding voltage” parameter, following
the Driver’s Initial Level and Time parameters settings.
X= 11 or 12 for the VCL name Driver_X_Command
This is also the “ramp-to” and “ramp-from” reference.
OUTPUTS — HALF-BRIDGE DRIVERS, cont’d
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