Nova Electronics MCX514, User Manual

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NOVA electronics Inc. MCX514 -
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Example for Parameter Setting of Constant Speed
The constant speed is set 980 PPS as shown in Fig. 2.2-2 below. In this case, the relative position driving that the drive pulse
number is 2450 is performed.
Initial speed SV = 980 Set the value which initial
speed
≧
Drive speed
Drive speed DV = 980
Drive
pulse number
TP = 2450
Please refer each parameter in chapter 7.2.
980
2.5
0
Speed
(pps)
time (sec)
Fig. 2.2-2 Example of Constant Speed Driving
2.2.2
Trapezoidal Driving [Symmetrical]
In linear acceleration / deceleration driving, the driving accelerates from the initial speed at the start of driving to the drive speed
in a primary linear form with a specified acceleration slope. Linear acceleration / deceleration driving can decelerate automatically
and no need to set a decelerating point. In fixed pulse driving under the symmetry trapezoidal acceleration / deceleration where
acceleration and deceleration are equal, it counts the number of pulses that were utilized at acceleration and automatic deceleration
starts when the rest of output pulses become less than the pulses at acceleration. Deceleration continues in the primary line with
the same slope as that of acceleration until the speed reaches the initial speed, and then driving will stop at the completion of the
output all pulses.
If the decelerating stop command is performed during acceleration, the driving will start to decelerate during acceleration, as show
in Fig. 2.2-3.
Decelerating stop is
performed during acceleration
Acceleration (slope)
Deceleration = Acceleration
Speed
time
Initial Speed
Drive Speed
Fig. 2.2-3 Trapezoidal Driving (Symmetry)
To perform symmetry linear acceleration / deceleration driving using automatic deceleration, bits D2 to 0 of WR3 register and the
following parameters must be set.
Table 2.2-2 Mode Setting
：
Linear Acceleration / Deceleration (Symmetry)
Mode Setting Bit Symbol Setting Comment
WR3/D0 MANLD 0 Automatic deceleration
WR3/D1 DSNDE 0 When in deceleration, acceleration setting value is used (symmetry).
WR3/D2 SACC 0 Linear acceleration / deceleration
Table 2.2-3 Setting Parameters
：
Linear Acceleration / Deceleration (Symmetry)
Parameter Symbol Comment
Acceleration AC When in deceleration, this value is used to decelerate.
Initial speed SV
Drive speed DV
Drive pulse number / Finish point TP Not required for continuous pulse driving.