Frequency Setting By Pulse Train Input - Mitsubishi Electric FR-A700 Instruction Manual

Special operation
6.24.5 Frequency setting by pulse train input (Pr. 291, Pr. 384 to Pr. 386)
The inverter speed can be set by inputting pulse train from terminal JOG.
Pr. No. Name
291
Pulse train input selection
Input pulse division
384
scaling factor
Frequency for zero input
385
pulse
Frequency for maximum
386
input pulse
Pulse train input selection (Pr. 291)
Setting any of "1, 11, 21, 100" in Pr. 291 "Pulse train input selection" and a value other than "0"
in Pr. 384 "Input pulse division scaling factor" switches terminal JOG to pulse train input terminal
and frequency setting of the inverter can be performed. (The initial value is JOG signal) Pulse
train input of maximum of 100k pulse/s is enabled.
Output specifications (high speed pulse train output or FM output) of terminal FM can be selec-
ted using Pr. 291.
Connection with an open collector output system pulse generator
Pull up resistance
Connection with an open collector output system pulse generator
Pull down resistance
Fig. 6-258: Pulse train input
When the wiring length of the open collector output connection is long, input pulse can not
be recognized because of a pulse shape deformation due to the stray capacitances of the
wiring. When wiring length is long (10m or more of 0.75mm
connect an open collector output signal and power supply using a pull up or pull down
resistance. The reference of resistance value to the wiring length is as in the table below.
6 - 514
Initial Setting
Description
Value Range
0 Terminal JOG
0
1 Pulse train input
0 Pulse train input invalid
Indicates division scaling factor
to the input pulse and the fre-
0
1–250 quency resolution to the input
pulse changes according to the
value.
Set the frequency when the
0Hz 0–400Hz
input pulse is 0 (bias).
Set the frequency when the
50Hz 0–400Hz
input pulse is maximum (gain).
Sink logic
Inverter
2 kΩ
Source logic
Inverter
2 kΩ
Parameters referred to
—
Connection with a complimentary output system pulse generator
Sink logic
24 V DC
Connection with a complimentary output system pulse generator
Source logic
24 V DC
2
twisted cable is recommended),
Parameter
Refer to
Section
Inverter
2 kΩ
Inverter
2 kΩ
I001628E