Speed Synchronized Operation By Pulse Input/Output; Speed Synchronized Operation Specification - Mitsubishi FR-A800 Instruction Manual

(D) Operation command and frequency command
NOTE
• The priority of the frequency command by the external signals is "Jog operation > multi-speed operation > terminal 4 analog
input". When pulse train input is enabled (Pr.291 = "1, 11, 21, 100" and Pr.384 ≠ "0"), terminal 2 analog input becomes
invalid.
Speed synchronized operation by pulse input/output
Inverter (master)
JOG
Pulse train
output

When the wiring length between FM and JOG is long, 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 size of
2
0.75 mm ), connect the terminal JOG to the terminal PC by an external pull-up resistance. The table below shows the reference resistance
values for wiring length.
Wiring length
Pull-up resistance
Load current (reference)
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 (terminal PC: 100 mA, high-
speed pulse train output: 85 mA), and use within the permissible range.
• Setting "100" to Pr.291 enables out of the pulse train input as it is to the pulse train output (terminal FM). Connecting in a
daisy chain enables speed synchronized operation of multiple inverters.
• Set Pr.384 to "125" for inverters that receive pulse train since the maximum pulse train output is 50k pulses/s.
• The maximum number of input pulses should be 50k pulses/s.
• When performing synchronized operation, wire according to the following procedure. (This is to prevent contact input of 24
V from being applied to the terminal FM.)
1) Set pulse train output (setting other than "0, 1") to Pr.291 on the master side inverter.
2) Turn the inverter power supply OFF.
3) Wire the slave side terminal JOG-SD to the master side terminal FM-SD.
4) Turn the inverter power supply ON.
NOTE
• After changing the Pr.291 setting, connect the JOG terminal to the terminal FM-SD. When FM output (voltage output) is taken
as the pulse train, take caution to prevent voltage from being applied to the terminal FM.
• Use the sink logic (factory setting) for the slave side inverter. The inverter does not operate properly with source logic.
Speed synchronized operation specification
Item
Output pulse format
Pulse rate
Pulse propagation delay
 A pulse transmission delay of about 1 to 2 s in the slave occurs and further increases when the wiring length is long.
Parameters referred to ???????
Pr.291 (Pulse train output)
Pr.419 Position command source selection
326
PARAMETERS
Pull up
resistance
Speed
command
FM
SD
Less than 10 m 10 to 50 m
Not required 1 kΩ
10 mA 35 mA
Specification
Pulse width fixed (10 s)
0 to 50 kpps
1 to 2 s/1 unit

page 369
page 244
To next inverter (slave)
∗1
PC
Pulse train
input
JOG
Pulse train
output
SD
50 to 100 m
470 Ω
65 mA
Speed
command
FM
To next inverter (slave)
SD