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Mitsubishi Electric FR-B-750 to 75K Instruction Manual Page 250

Fr-b-750 to 75k (200v class), fr-b-750 to 110k (400v class).
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(4) Synchronous speed operation by pulse I/O
Inverter (master)
JOG
Pulse train
output
* 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 can not be
recognized.
When wiring length is long (10m or more of 0.75mm
resistance. The reference of resistance value to the wiring length is as in the table below.
Wiring Length
Less than 10m
Pull up resistance
Not necessary
Load current (for
10mA
reference)
Stray capacitances of the wiring greately 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
CAUTION
· After changing a setting value of Pr. 291 , connect JOG terminal between termial 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 (initial setting). The inverter will not function properly if source logic is selected.
Specifications of synchronous speed operation
Item
Output pulse type
Pulse rate
Pulse transmission delay
* When a pulse transmission delay in a slave is approximately 1 to 2µs and wiring length is long, the delay further increases.
♦ Parameters referred to ♦
Pr. 291 (pulse train output )
To next inverter (slave)
Pull up
resistance*
PC
Speed
command
FM
JOG
SD
SD
2
twisted cable is recommended), connect terminal JOG and terminal PC using an external pull up
10 to 50m
1kΩ
35mA
Specifications
Pulse width is fixed (10µs)
0 to 50kpps
1 to 2µs per inverter *
Refer to page 142
Special operation and frequency control
Speed
Pulse train
command
input
Pulse train
output
50 to 100m
470Ω
65mA
FM
To next inverter (slave)
SD
241
4

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