R5: Ramping-Down Point Register (16 Bits) - Advantech PCI-1243U User Manual

4.1.6 R5: Ramping-Down Point Register (16 bits)

While in preset, high-speed operation, PCI-1243U compares the value in
this register, R5, to the value in the preset counter. When the value in R5
is larger than the preset counter value, the PCI-1243U will start to decel-
erate.
If the value placed in R5 is smaller than the preset counter value and the
PCI-1243U is programmed for preset, high-speed operation, the motor
will operate at FL speed and not accelerate.
The FL speed, FH speed, and the accel/decel rate determine the ramping-
down point.
Please note that in PCI-1243U, the R5 value is calculated by the user. The
system will not define the R5 value automatically.
Entering inappropriate values may stop the output of pulses during decel-
eration, or cause PCI-1243U to operate longer at the FL speed after decel-
eration.
The allowable range is 0 to 65,535 (FFFF HEX) of pulses remaining at
which to start deceleration.
Calculating the Ramping-Down Point
R5 set value [pulses] = {[(R2 set value)2 - (R1 set value)2] x (R3 set
value) x Multiplier} / [(R4 set value) x 8192]
The value for R5 has to be calculated and written in the register.
Note
When determining the ramping-down point, the FL frequency, the FH
frequency and the deceleration rate have to be taken into account. If an
improper value is set, pulse output may be terminated halfway during
ramping-down (Figure 4.3. A) or may continue after ramping-down,
causing longer FL speed operation (Figure 4.3. C).
PCI-1243U User Manual
Multiplier = 1 while in Linear Accel/Decel mode
Multiplier = 2 while in S-curve Accel/Decel mode
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