366
Special operation and frequency control
* When the wiring length of the open collector output connection is long, input pulse can not be recognized because of a pulse shape deformation due to the
stray capacitances of the wiring.
When wiring length is long (10m or more of 0.75mm
2
twisted cable is recommended), connect an open collector output signal and power supply using a pull
up resistance. The reference of resistance value to the wiring length is as in the table below,
Stray capacitances of the wiring greately differ according to the cable type and cable laying, the above cable length is not a guaranteed value.
When using a pull up/down resistance, check the permissible power of the resistor and permissible load current of output transistor and use them within a
permissible range.
zPulse train input specifications
(3) 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
· For 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 = 0Hz, Pr. 386 = 30Hz (pulse train limit value is 33Hz)
Wiring Length Less than 10m 10 to 50m 50 to 100m
Pull up/down resistance Not necessary 1kΩ 470Ω
Load current (for reference) 10mA 35mA 65mA
REMARKS
· When pulse train input is selected, a function assigned to terminal JOG using Pr. 185 JOG terminal function selection is made invalid.
· When Pr. 419 Position command source selection = "2" (conditional position pulse train command by inverter pulse train input),
JOG terminal serves as conditional position pulse train terminal regardless of the Pr. 291.
Item Specifications
Available pulse method
Open collector output
Complimentary output
(power supply voltage 24V)
* The wiring length of complementary
output depends on the output wiring
specifications of complementary
output device.
Stray capacitances of the wiring
greatly differ according to the cable
type and cable laying, the
maximum cable length is not a
guaranteed value.
H input level 20V or more (voltage between JOG-SD)
L input level 5V or less (voltage between JOG-SD)
Maximum input pulse rate 100kpps
Minimum input pulse width 2.5us
Input resistance/load current 2k
Ω (typ) / 10mA (typ)
Maximum wiring
length
(reference value)
Open collector output system
10m (0.75mm
2
/ twisted pair)
Complemenraty output system 100m (output resistance 50
Ω) *
Detection resolution 1/3750
(2) 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 frequency at maximum input
pulse can be set using Pr. 386 Frequency for maximum input
pulse.
* Limit value can be calculated from the following formula.
(Pr. 386 - Pr. 385 ) × 1.1 + Pr. 385
REMARKS
The priorities of the frequency commands by the external signals are "jog operation > multi-speed operation > teminal 4 analog
input > pulse train input".
When pulse train input is made valid (when Pr. 291 = "1" and Pr. 384
≠ "0"), terminal 2 analog input is made invalid.
60Hz
Pr. 386
0Hz
Maximum input pulse
Limit value
*
Input pulse
(pulse/s)
(Hz)
Output
frequency
0
Pr. 385
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