Mitsubishi Electric FR-E8AXY E KIT Instruction Manual page 61

 Selection of pulse train input (Pr.291)
• Setting Pr.291 Pulse train input selection = "1" and Pr.384 Input pulse division scaling factor ≠ "0" allows the function
of terminal X7 to change into a pulse train input for setting of the inverter frequency. In the initial setting, no function is
assigned to terminal X7. A maximum pulse train of 100k pulses/s can be input.
• Connection with an open collector output system pulse generator
Sink logic
24V
S/S
Pull up
resistor 
X7
SD
*1 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
shows the reference resistance values for wiring length. The stray capacitance of the wiring changes considerably according to what kind
of cable is used how the cable is laid, thus the following 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
Pull-up/down resistor
Load current (reference)
60
CONTROL CIRCUIT INPUT SIGNAL
Inverter
2 kΩ
2
), connect the open collector output signal to the power supply by an external pull-up resistor. The following table
Less than 10 m 10 to 50 m
Not required 1 kΩ
10 mA 35 mA
Source logic
Inverter
24V
X7
Pull down
S/S

resistor
SD
50 to 100 m
470 Ω
65 mA
2 kΩ