When using SIM3 or SIM 4 operation for short moves it is possible to predict the number of
steps the motor will take using the formula :
Number of motor steps to move =
INT
CMR
×
no. of pulses received + prev. remainder
CUR
where INT means "take the integer part of", with the value rounded towards zero whether
positive or negative. The controller can repeatedly apply this formula to establish an iterative
calculation. In situations where short moves have been programmed the ratio of CMR/CUR
may only approximate the number of steps the motor is required to move, but since the
remainder is carried forward no steps are lost. This allows the CMR/CUR value to better
approximate the following ratio in subsequent moves.
In summary, short moves may only approximate the defined following ratio, but no positioning
accuracy is lost in later moves.
Buffered Clock Mode
SIM3 or SIM4 work in a buffered clock mode, which allows the controller to buffer an
unprofiled following-input pulse stream until the output velocity equals the following input
velocity. The controller accelerates the output velocity to match the input velocity using an
exponential acceleration profile, the time constant of which is set using the CAG command.
The default time constant value of CAG is 1.00ms to accept already profiled follower inputs.
The input pulses are buffered (or stored) at the input resolution, the actual number being
stored at any particular instant being termed the following error. This can lead to input pulses
being lost above a maximum speed, due to excessive following error.
The maximum number of input pulses that can be buffered is
+/-32767 which requires CAG to be less than
32767
input pulse rate
to prevent overflow.
Preset Following Index Mode
The following mode SIM5 selects indexing at a speed determined by the external input. In
this mode the controller sets the motor velocity to a speed in rps determined as a percentage
of the following input speed in rps. The percentage following factor is set by the FOL
command which can be varied between 0.0 and 5000.0%.
When using this mode the acceleration is fixed to whatever is defined by the A command,
and the V command value has no effect since the FOL command percentage value will now
control the velocity.
The velocity is dependent on the user resolution (CUR value) and the motor resolution (CMR
value). CUR and CMR set the encoder / motor resolution ratio so that the input shaft speed
will match the output shaft speed with FOL set to 100%.
The FOL value can be entered from a variable, for example:
1FOL(VAR1)
Pulses must be present at the input when the G command is executed.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Содержание PDHX-E Series
Страница 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 15: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 68: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 92: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 98: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 101: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...