Mitsubishi Electric FR-A800 Series Instruction Manual page 410

Pr.385 = 0 Hz, Pr.386 = 30 Hz (pulse train limit value 33 Hz)
NOTE
• The priority of the frequency command given by the external signals is as follows: JOG operation > multi-speed operation >
terminal 4 analog input > pulse train input. When pulse train input is enabled (Pr.291 = "1, 11, 21, or 100" and Pr.384 ≠ "0"),
terminal 2 analog input becomes disabled.
 Speed synchronized operation by pulse input/output
Inverter (master)
JOG
*1 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 0.75
mm
for wiring length.
Wiring length
Pull-up resistor
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 resistor, check the permissible power 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" in Pr.291 allows the use of the entire pulse train input for the pulse train output (via terminal FM) just as they
are.
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 being applied to terminal FM.)
1.
Set pulse train output (setting other than "0 or 1") to Pr.291 on the master side inverter.
2.
Inverter power 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 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 1 to 2 μs per unit
*1 A pulse propagation delay of about 1 to 2 μs in the slave occurs and further increases when the wiring length is long.
Parameters referred to
Pr.291 (Pulse train
Pr.419 Position command source
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Speed
command
Pulse train
output
2
), connect between terminal JOG and terminal PC with an external pull-up resistor. The following table shows the reference resistance values
Less than 10 m
Not required
10 mA
Specification
Pulse width fixed (10 μs)
0 to 50k pulses/s
*1
output)page 457
selectionpage 319
search engine
To next inverter (slave)
Pull up
*1
resistor
PC
Pulse train
input
FM JOG
Pulse train
output
SD SD
10 to 50 m
1 kΩ
35 mA
5.9 (D) Operation command and frequency command
Speed
command
FM
To next inverter (slave)
SD
50 to 100 m
470 Ω
65 mA
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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