Mitsubishi Electric FR-A800, Instruction Manual

Page: 463 / 1042

Parameters (D) Operation command and frequency command
FR-A800 5 - 283
●
Connection with an open collector output system pulse generator
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
2
), connect the open collector output signal to the power supply by an
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.
●
Connection with a complementary output system pulse generator
I002573E
Fig. 5-113: Pulse train input
Wiring length Less than 10 m 10 to 50 m 50 to 100 m
Pull-up/down resistance Not required 1 kΩ 470 Ω
Load current (reference) 10 mA 35 mA 65 mA
Tab. 5-113: Resistance values for pull up and pull down resistances
I002574E
Fig. 5-114: Pulse generator output
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.)
Sink logic
Inverter
Pull up resistance
Pull down resistance
Source logic
2 k
Inverter
PC
JOG
SD
JOG
PC
2 k
SD
Inverter
Sink logic
24 V
power
JOG
PC
SD
2 k
24 V
power
JOG
PC
SD
2 k
Inverter
Source logic