Delta RMC151 - Manual (Page 911)

9 Register Reference
Data Type: REAL
Units: Volts or mA
Range: any
Default Value: 0
Description
This parameter is used on velocity input axes to specify the voltage or current input range
in which the velocity is zero. If the absolute value of the voltage or current is outside of
this value, this value is always subtracted from (added to, if the voltage or current is
negative) the voltage or current input before being converted to the Actual Velocity.
Since velocity feedback is an analog signal, it is impossible to be exactly zero. Therefore,
this parameter allows you to specify a range in which the velocity is assumed to be zero.
This helps determine when the axis is actually stopped.
If this value is zero the deadband is disabled.
Changing this Parameter
Because this parameter affects motion, the axis must be disabled or in Direct Output
before writing to this parameter. The Enabled and Direct Output Status Bits indicate these
states of the axis. When changing this parameter from RMCTools, the software will
automatically do this for you. This may cause a halt on the axis, which is expected.
9.2.2.2.5. Velocity Offset
Type: Axis Parameter Register
RMC70 Address: %MDn.1, where n = 12 + the axis number
RMC150 Address: %MDn.1, where n = 24 + the axis number
System Tag: _Axis[n].VelOffset, where n is the axis number
How to Find: Axes Parameters Pane, Setup tab: Primary Control Setup
Data Type: REAL
Units: V or mA
Range: any
Default Value: 0
Description
On velocity input axes, this parameter is used together with the Velocity Scale to
calculate the Actual Velocity from the input.
Actual Velocity = Velocity Scale x [(Voltage or Current) + Velocity Offset]
Setting the Velocity Offset
Set the Velocity Offset before setting the Velocity Scale. To set the Velocity Offset
parameter, make sure the tachometer is stopped. Then adjust the Velocity offset until the
Actual Velocity is zero. For more details, see the Analog Velocity Scaling topic.
Changing this Parameter
Because this parameter affects motion, the axis must be disabled or in Direct Output
before writing to this parameter. The Enabled and Direct Output Status Bits indicate these
states of the axis. When changing this parameter from RMCTools, the software will
automatically do this for you. This may cause a halt on the axis, which is expected.
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