30 DC motor driver module XN-322-1DCD-B35
30.3 Wiring
242
XN300 slice modules
06/16 MN050002 EN
www.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-cir-
cuited generator.
Figure 128:
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 129:
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 sig-
naled 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.
Diving 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
Содержание XN300
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