X20 system modules • Motor controllers • X20MM4456
1968
X20 system User's Manual 3.10
4.25.5.15.3.3 PWM period duration
Name:
PeriodDurationPWM
This register can be used to set the period duration between 20 μs (50 kHz) and 65,535 μs (15 Hz).
Data type
Value
Information
UINT
20 to 65,535
Time in µs
4.25.5.15.3.4 PWM pulse width
Name:
PulseWidthCurrentPWM01 to PulseWidthCurrentPWM04
The PWM pulse width (PWM mode) or current setting (in current mode) is entered in this register according to the
setting in the module configuration register. A negative value changes the output polarity.
PWM mode
Data type
Value
Output -
32,767
High
Low
16,384
PWM 50/50
Low
0
Low
Low
-16,384
Low
PWM 50/50
INT
-32,767
Low
High
Current mode
Data type
Value
Current mode
19,661 to 32,767
6 to 10 A (max. 2 s)
19,660
6 A
0
0 A
-19,660
-6 A
INT
-19,661 to -32,767
-6 to -10 A (max. 2 s)
Resolution/Derating
As mentioned earlier in the technical data, the PWM resolution is 15-bit (+ sign). This value is derated for a period of
less than 328 µs because of the minimal PWM timing resolution (10 ns) (see following diagram). With the minimum
PWM period duration of 20 µs, the PWM has 11-bit resolution (+ sign):
10
100
1,000
16
15
14
13
12
11
10
15-bit at 328 µs
11-bit at 20 µs
Period (µs)
R
es
ol
ut
io
n
(b
it)
4.25.5.15.3.5 Dither
A dither is used to prevent valves from sticking. This function is supported in both PWM mode and in current mode.
The pulse width or current is adjusted according to the dither amplitude and dither frequency.
By default, the dither is active for both outputs as soon as the dither amplitude and dither frequency are set to a
value >0. If necessary, the dither can be deactivated for each output individually or simultaneously (see bit 3 in
the respective control register).
Dither amplitude
Name:
ConfigOutput01
This register can be used to configure the amplitude value or pulse width.
0 to 255 corresponds with an amplitude value from 0.0 to 25.5% of the maximum current or the maximum pulse
width of 32,767.
Data type
Value
Information
USINT
0 to 255
Amplitude value or pulse width
Summary of Contents for X20 System
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