Copley Controls Xenus R10 Manual page 181

PwM lIMITInG InPUT
i2t limit settings
% Vi2t Ri2t
100 5.0 <oUT>
90 4.50 90000
80 4.00 40000
70 3.50 23333
60 3.00 15000
50 2.50 10000
40 2.00 6667
30 1.50 4286
20 1.00 2500
10 0.50 1111
about pwm limiting
PWM limiting sets a maximum value for the on vs. off time of the outputs of the amplifier. While the peak voltage seen by the load remains about the
same as the supply voltage (HV), the average voltage seen by the motor can be limited.
A common use of this is to limit the maximum RPM of a motor even though it's operating in torque mode.
pwm limit settings
Rset (K)
% Vset
97 <oUT> 4.95
78 42 4.00
70 30 3.71
68 25 3.54
62 20 3.3
57 15 2.97
45 10 2.48
38 7.5 2.12
28 5 1.65
25 2.5 0.99
25 0 0
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Tech Support: E-mail: sales@copleycontrols.com, Internet: http://www.copleycontrols.com
Bantam R30
equivalent circuit
+5 V
10000
J1-2
Vi2t
I2T
Ri2t
Control
equivalent circuit
J1-8
Vpwm
Rset
example i2t setting
If a voltage Vpeak is used to control the I2T,
it can be found like this:
Vi2t = 5.0 * I2TSecs
AmpI2Tlimit
Example: find Vi2t for a 6 A PeakLimitCurrent
using a R30-090-20:
Vpeak = 4.80 * 6 = 1.44 V
I2T
To use a resistor for setting Peak-limit current,
calculate the value as follows:
Rpeak =
Example: find Rpeak for a 14 A PeakLimitCurrent:
Rpeak =
example pwm setting
The table shows duty cycles measured with some choices
of Rset for the PwM limits.
+5
10k
Vset
Amplifier
Tel: 781-828-8090
R30
20
9600 * PeaklimitCurrent
(AmpPeakCurrent - PeakLimitCurrent)
9600 * 14 = 22,400 ohms
(20 - 14)
Fax: 781-828-6547
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