Справочник Пользователя для Mitsubishi Electronics FR-A700

* When the wiring length between FM and JOG is long, a pulse shape is deformed due to the stray capacitances of the wiring and input pulse cannot be

recognized.
When wiring length is long (10m or more of 0.75mm

2

 twisted cable is recommended), connect terminal JOG and terminal PC using an external pull up

resistance. The reference of resistance value to the wiring length is as in the table below.

Stray capacitances of the wiring greatly differ according to the cable type and cable laying, the above cable length is not a guaranteed value.
When using a pull up resistance, check the permissible power and permissible load current (terminal PC : 100mA, high speed pulse train output : 85mA) of the
resistor and use them within a permissible range.

· By setting "100" in Pr. 291, pulse train input can be output at pulse train output (terminal FM) as it is.

Synchronous speed operation of multiple inverters can be enabled by daisy chain connection.

· Since maximum pulse train output is maximum of 50k pulse/s, set "125" in Pr. 384 of the inverter receiving pulse train.
· When operating two or more inverters synchronously, perform wiring according to the following steps. (so that 24V

contact input will not be applied to terminal FM)
1) Set pulse train output (a value other than "0, 1") in Pr. 291   of the master side inverter.
2) Turn OFF the inverter power
3) Perform wiring of the master side terminal FM-SD and slave side terminal JOG-SD
4) Turn ON the inverter power

z

*

When a pulse transmission delay in a slave is approximately 1 to 2

μs and wiring length is long, the delay further increases.

Pull up resistance

Not necessary

1k

Ω

470

Ω

Load current (for 

reference)

10mA

35mA

65mA

· After changing a setting value of Pr. 291, connect JOG terminal between terminal FM and SD. Take note that a voltage should

not be applied to terminal FM specially when FM output (voltage output) pulse train is selected.

· For the slave side inverter, use sink logic (factory setting). The inverter will not function properly if source logic is selected.

Output pulse type

Pulse width is fixed (10

μs)

Pulse rate

0 to 50kpps

Pulse transmission delay

1 to 2

μs per inverter *

♦ Parameters referred to ♦

Pulse train 

input

Inverter (master)

To next inverter (slave)

To next inverter (slave)

FM

SD

FM

SD

JOG

PC

JOG

SD

Speed 

command

Pulse train 

output

Pull up 

resistance*

Pulse train 

output

Speed 

command