Mitsubishi Electric 800 Series Instruction Manual page 310

Selection of pulse train input(Pr.291)
• Setting Pr.291 Pulse train I/O selection = "1, 11, 21, 100" and Pr.384 Input pulse division scaling factor  "0" changes
the function of terminal JOG to a pulse train input so that the frequency can be set to the inverter. In the initial setting, the
JOG signal is assigned to terminal JOG. A maximum pulse train of 100k pulses/s can be input.
• Connection with an open collector output system pulse generator
Sink logic
PC
Pull up resistor ∗1
JOG
SD

When the wiring length is long with open collector outputs, the influence of stray capacitance causes the pulse to flatten out and prevents the
input pulse from being recognized.
When the wiring length is long (10 m or longer of shielded twisted pair cable with a recommended cable gauge of 0.75 mm
collector output signal to the power supply by an external pull-up resistor. The table below shows the reference resistance values for wiring
length. The stray capacitance of the wiring changes considerably according to how the cable is laid, thus the above wiring lengths are not
guaranteed values. When using a pull-up/down resistor, check the permissible power of the resistor and the permissible load current of the
output transistor, and use within the permissible range.
Wiring length Less than 10 m
Pull-up/down resistor
Load current (reference)
• Connection with a complementary output system pulse generator
Sink logic
24 V power
NOTE
• When pulse train input is selected, the function assigned to terminal JOG by Pr.185 JOG terminal function selection is
invalid.
• When "2" (simple position pulse train command by pulse train input) is set to Pr.419 Position command source selection,
the JOG terminal becomes the simple position pulse train terminal regarding of the Pr.291 setting.
• Pr.291 is the selection parameter for pulse train output/FM output. Thus, before changing the setting, check the specifications
of the device connected to the terminal FM. (For the pulse train output, refer to
Pulse train input specification
Item
Supported pulse method
HIGH input level
LOW input level
Maximum input pulse rate
Minimum input pulse width
Input resistance/load current
Open collector output method
Maximum wiring length
(reference value)
Complementary output method
Detection resolution

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 according to how the cable is laid, thus the maximum wiring length is not a guaranteed value.
Inverter
2 kΩ
Pull down resistor
10 to 50 m
Not required
1 kΩ
10 mA 35 mA
Inverter
PC
JOG
2 kΩ
SD
Open collector output.
Complementary output. (24 V power supply voltage)
20 V or more (voltage between JOG and SD)
5 V or less (voltage between JOG and SD)
100k pulses/s
2.5 us
2 kΩ (typ)/10 mA (typ)
10 m (0.75 mm
100 m (output resistance 50 Ω)
1/3750
(D) Operation command and frequency command
Source logic
Inverter
PC
JOG
2 kΩ
∗1
SD
50 to 100 m
470 Ω
65 mA
Source logic
24 V power
page
Specification
2
/twisted pair)

2
), connect the open
Inverter
PC
JOG
2 kΩ
SD
360.)
PARAMETERS
5
GROUP
D
309