Mitsubishi Electric FR-A700 Instruction Manual page 696

Special operation
Adjustment of pulse train input and frequency (Pr. 385, Pr. 386 )
Frequency for zero input pulse can be set using Pr. 385 "Frequency for zero input pulse" and fre-
quency at maximum input pulse can be set using Pr. 386 "Frequency for maximum input pulse".
Fig. 6-259: Adjustment of pulse train input
Limit value can be calculated from the following formula.
(Pr. 386 − Pr. 385) × 1.1 + Pr. 385
Calculation method of division scaling factor of input pulse (Pr. 384 )
Maximum input pulse can be calcualted from the following formula using Pr. 384 "Input pulse
division scaling factor".
Maximum of input pulse (pulse/s) = Pr. 384 × 400 (maximum of 100kpulse/s)
Detectable pulse = 11.45 pulse/s
Example When you want to operate at 0Hz when pulse train input is zero and operate at 30Hz when
pulse train is 4000 pulse/s, set parameters as below.
Pr. 384 = 10 (maximum input pulse 4000 pulse/s)
Pr. 385 = 0 Hz, Pr. 386 = 30 Hz (pulse train limit value is 33 Hz)
NOTE The priorities of the frequency commands by the external signals are
"jog operation > multi-speed operation > teminal 4 analog input > pulse train input >
terminal 2 analog input".
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Output frequency [Hz]
50Hz
Pr. 386
0Hz
0
Pr. 385
Limit value
Input pulse [Pulse/s]
Maximum input pulse
Parameter
I001629E