Eaton XN300 - Page 275

34 DC motor driver module XN-322-1DCD-B35
34.3 Wiring topic
271 XN300 slice modules 02/24 MN050002EN Eaton.com
Motor armature short-circuit
If bits 14 and 15 are set at the same time, the motor will be short-circuited to
ground. At this point, the motor will brake, as it will be working as a
short-circuited generator.
Figure 146: Block diagram showing a motor armature short-circuit
Motor Off
If all bits are set to 0, the motor will not receive any pulses and will not have
a connection to ground. If there is any motor power, it will not be possible for
this power to be discharged to ground.
Figure 147: Block diagram showing open motor
Short-circuit fault message
If bit 12 and bit 14, or bit 13 and bit 15, were to be set at the same time
(left_high and left_low), this would result in a short-circuit. The device will
interpret this state as incorrect input and switch the motor off.
If the motor is switched off due to erroneous sequence input, this will be
signaled with a fault message. It will not be possible to switch the motor
back on until this error message is cleared with the acknowledgment bit.
Defining the sequence time
Bits 0 to 10 in registers 0x20E0 to 0x20E3 are used to store a time value.
Dividing this time value by the system clock frequency (32 MHz) yields the
sequence time.

CAUTION
Use external mechanisms to make sure that the motor will be in
a safe state after stopping.
Sequence time =
Time value register entry (bits 0-10)
System clock frequency
VCC
M
Bit 13/RH
Bit 12/LH
Bit 14/LL Bit 15/RL
--
VCC
M
Bit 13/RH
Bit 12/LH
Bit 14/LL Bit 15/RL