Mitsubishi Electric FR-F820-00046, Instruction Manual

Page: 314 / 940

(D) Operation command and frequency command Parameters
5 - 142
Pulse train input specification
The wiring length of complementary output is dependent on the output wiring specification of
the complementary output unit. The stray capacitance of the wiring changes considerably accord-
ing to how the cable is laid, thus the maximum wiring length is not a guaranteed value.
Adjustment of pulse train and frequency (Pr. 385, Pr. 386)
The frequency during zero input pulse and maximum input pulse can be set with Pr. 385 "Frequency
for zero input pulse" and Pr. 386 "Frequency for maximum input pulse", respectively.
Limit value = (Pr. 386 - Pr. 385) x 1.1 + Pr. 385
How to calculate the input pulse division scaling factor (Pr. 384)
●
The maximum number of pulses can be calculated by the following formula with Pr. 384 "Input
pulse division scaling factor":
Maximum number of pulses (pulse/s) = Pr. 384 × 400 (maximum 100k pulses/s)
(number of detectable pulses = 11.45 pulses/s)
●
For example, to run the invert at 0 Hz when pulse train input is zero and at 30 Hz when pulse train
is 4000 pulses/sec, set the inverter as follows:
Pr. 384 = 10 (maximum number of input pulses 4000 pulses/s)
Pr. 385 = 0 Hz, Pr. 386 = 30 Hz (pulse train limit value 33 Hz)
Item Specification
Supported pulse method
Open collector output.
Complementary output. (24 V power supply voltage)
HIGH input level 20 V or more (voltage between JOG and SD)
LOW input level 5 V or less (voltage between JOG and SD)
Maximum input pulse rate 100 kpps
Minimum input pulse width 2.5
μ
s
Input resistance/load current 2 kΩ (typ)/10 mA (typ)
Maximum wiring length
(reference value)
Open collector output
method
10 m (0.75 mm²/twisted pair)
Complementary output
method
100 m (output resistance 50 Ω)
Detection resolution 1/3750
Tab. 5-64: Pulse train input specification
I002575E
Fig. 5-39: Adjustment of pulse train input
NOTE The priority of the frequency command by the external signals is "Jog operation > multi-speed
operation > terminal 4 analog input". When pulse train input is enabled (Pr. 291 = "1, 11, 21, 100"
and Pr. 384 ≠ "0"), terminal 2 analog input becomes invalid.
0
Limit value
Input pulse
(pulse/s)
Maximum input pulse
60 Hz/50 Hz
Pr. 386
Ou
tp
u
t
fr
eque
nc
y
(Hz)
0 Hz
Pr. 385