Mitsubishi Electric FR-A820-00046 Instruction Manual page 463

Parameters
● Connection with an open collector output system pulse generator
Pull up resistance
Fig. 5-113:
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
external pull-up resistance. 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
resistance, check the permissible load of the resistor and the permissible load current of the output
transistor, and use within the permissible range.
Wiring length
Pull-up/down resistance
Load current (reference)
Tab. 5-113: Resistance values for pull up and pull down resistances
● Connection with a complementary output system pulse generator
24 V
power
Fig. 5-114:
NOTES 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 set-
ting, check the specifications of the device connected to the terminal FM. (For the pulse train out-
put, refer to page 5-346.)
FR-A800
Sink logic
Inverter
PC
JOG
2 k
SD
Pulse train input
2
), connect the open collector output signal to the power supply by an
Less than 10 m
Not required
10 mA
Sink logic
Inverter
PC
JOG
2 k
SD
Pulse generator output
(D) Operation command and frequency command
Source logic
PC
JOG
Pull down resistance
SD
10 to 50 m
1 kΩ
35 mA
Source logic
24 V
power
Inverter
2 k
I002573E
50 to 100 m
470 Ω
65 mA
Inverter
PC
JOG 2 k
SD
I002574E
5 - 283