DMC-40x0 Command Reference BZ • 57
BZ
FUNCTION: Brushless Zero
DESCRIPTION:
The BZ command is used for axes which are configured for sinusoidal commutation. This
command drives the motor to zero magnetic phase and then sets the commutation phase to
zero.
This command may be given when the motor is off.
ARGUMENTS: BZ n,n,n,n,n,n,n or BZA =n or BZ <t where
n is a real number between -4.998 and 4.998. The parameter n will set the voltage to be applied to
the amplifier during the initialization. In order to be accurate, the BZ command voltage must
be large enough to move the motor. If the argument is positive, when the BZ operation is
complete, the motor will be left in the off state, MO. A negative value causes the motor to
end up in the on state, SH.
<t is an integer between 1 and 32767 and represents the settling time of the BZ function. The
controller will wait ‘t’ μsec to update sufficient samples (sampling rate = 1000 μsec by
default) to settle the motor at the zero magnetic phase. The t parameter should be specified
prior to issuing the BZ command.
Note: The BZ command causes instantaneous movement of the motor. It is recommended to start
with small voltages and increase as needed
Note: Always use the Off On Error function (OE command) to avoid motor runaway whenever
testing sinusoidal commutation.
USAGE: DEFAULTS:
While Moving No Default Value n = 0, t= 1000
In a Program Yes Default Format 0
Command Line Yes
Controller Usage
ALL CONTROLLERS
OPERAND USAGE:
_BZn contains the distance in encoder counts from the motor's current position and the position of
commutation zero for the specified axis. This can useful to command a motor to move to the
commutation zero position for phase initialization.
RELATED COMMANDS:
BA Brushless Axis
BB Brushless Phase Begins
BC Brushless Commutation
BD Brushless Degrees
BI Brushless Inputs
BM Brushless Modulo
BO Brushless Offset
BS Brushless Setup
EXAMPLES:
BZ, -3 Drive C axis to zero phase with 3 volt signal, and end
with motor enabled.
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