30 DC motor driver module XN-322-1DCD-B35
30.3 Wiring
XN300 slice modules
06/16 MN050002 EN
www.eaton.com
239
30.3.4 How the XN-322-1DCD-B35 works
XN-322-1DCD-B35 slice modules can be used to run a brushed DC motor
with a rated operational current of up to 3.5 and an operational voltage of up
to 30 VDC. The motor can be driven in the following way:
•
pulse width modulation
When using pulse width modulation, the manipulated variable is controlled
by using variable pulse widths while keeping a constant period duration. The
manipulated variable in this case is the power delivered to the motor.
The duration of the 4 steps, i.e., the sequence time, is specified in registers
0x32E0 to 0x20E3 with 11 bits. Meanwhile, the period duration is defined,
relative to the internal clock frequency of 32 MHz, in register 0x20E4 with 16
bits.
Generating the output signal for the motor drive
The PWM output sequence for driving the motor is transmitted to the XN300
module with four subsequences using four objects, 0x20E0 to 0x20E3.
These subsequences are grouped together in a fixed order in order to make
up the output sequence, with each of the subsequences containing the fol-
lowing information:
•
Operating direction: Definition of operating direction by activating the
output driver.
•
Time reference:
•
Relative: The sequence time's starting point will be the end of the
previous sequence.
•
Absolute: The sequence time's starting point will be the start of the
period. The duration of previous sequences must be taken into
account.
•
Sequence time: The sequence time, relative to the internal clock fre-
quency of 32 MHz, is defined in an 11-bit register (min: 29
hex
(1.3
μ
s),
max: (63.9
μ
s))
If the defined period duration is shorter than the time defined with the
sequences, the sequence will be interrupted and restarted at the end of the
period duration.
The operating direction is defined with the states of bits 12 to 15 in the
sequence register.
Figure 125:
Pulses at output terminal X1, pin M+ module output
PD: Period duration
0
1
PD
PW
PW
Summary of Contents for XN300
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