Relationship Between Parameters (Registers) - Fuji Electric micrex-sx SPH User Manual

6-2 Relationship between Parameters (Registers)

Relationship between parameters (registers)
Current frequency register
Acceleration/deceleration
register
• Acceleration/deceleration register : Controls acceleration/deceleration time (acceleration).
• Target frequency register
• Base frequency register
• Current frequency register
• Speed multiplication register
• Command pulse register
• Deceleration point register
The pulse frequency which is output from the NP1F-MP1/NP1F-MP2 is calculated using the following formulas.
1) When the effective bit length of the frequency register is 20 bits
Output frequency (kHz) = 25000kHz x {(Set value of frequency register) / (2
Sample setting:
When the maximum output frequency is to be 1MHz, the following value is assigned to the speed multiplication
register:
(Set value of speed multiplication register) = (25 / 1) x (1/2) - 1 = 11.5
Because the value assigned to the speed multiplication register must be an integer, 11 is assigned.
Then the maximum output frequency becomes (Maximum output frequency) = 25000kHz / 24 = 1041667Hz
And frequency resolution is
(Frequency resolution) = 1041667Hz / 2
2) When the effective bit length of the frequency registeris 16 bits
Output frequency (kHz) = 25000kHz x {(Set value of frequency register) / (2
Sample setting:
When the maximum output frequency is to be 250kHz, the following value is assigned to the speed multiplication
register:
(Set value of speed multiplication register) = (25000 / 250) x (1/2) - 1 = 49
And the frequency resolution at this time is
(Frequency resolution) = 250000Hz / 2
Command pulse register
: Controls the pulse output frequency.
(Does not specify "Hz" values when set for the positioning module.)
: Controls the automatic-start frequency.
: Controls the measured value of command frequency.
: Controls the maximum pulse output frequency.
: Controls the output pulse count. The number of remaining pulses is stored in this
register.
: Controls the deceleration starting point.
multiplication register) + 1)} x (1/2)
20
= 0.99Hz
multiplication register) + 1)} x (1/2)
16
= 250000Hz / 65536
= 3.81Hz
Target frequency register
Speed multiplication register
Deceleration point register
Base frequency register
Speed multiplication register
Time
20 )} x {1 / (Set value of speed
16
)} x {1 / (Set value of speed
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