Mitsubishi Electric FR-A700 Technical Manual page 194

2.4.7 Frequency setting by pulse train input [Pr. 291, 384 to 386]
The inverter speed can be set by inputting pulse train from terminal JOG.
In addition, synchronous speed operation of inverters can be performed by combining pulse train I/O.
[Pr. ] Name
291 Pulse train I/O selection
Input pulse division scaling
384
factor
385 Frequency for zero input pulse
Frequency for maximum input
386
pulse
(1) Pulse train input selection [Pr. 291, 384]
Setting any of "1, 11, 21, 100" in [Pr. 291 Pulse train I/O
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.
When pulse train input is selected, a function assigned to
terminal JOG using [Pr. 185 JOG terminal function selection]
is invalid.
When [Pr. 419 Position command source selection = 2]
(conditional position pulse train command by inverter
pulse train input), JOG terminal serves as conditional
position pulse train terminal regardless of the [Pr. 291].
The priority of the frequency command by the external
signals is "Jog operation
Terminal 4 analog input
analog input".
Pulse train input specifications
Item
Available pulse method
H input level
L input level
Maximum input pulse rate
Minimum input pulse width
Input resistance/load current
Open collector
Maximum
wiring length output method
(reference Complementary
value) output method
Detection resolution
* The wiring length of complementary output depends on the output
wiring specifications of complementary output device.
Stray capacitances of the wiring greatly differ according to the cable
type and cable laying, the above maximum cable length is not a
guaranteed value.
Initial Setting
Value Range
0
1
10
0 11
20
21
100
0
0
1 to 250
0Hz 0 to 400Hz Set the frequency when the input pulse is 0 (bias).
60Hz 0 to 400Hz Set the frequency when the input pulse is maximum (gain).
Multi-speed operation
Pulse train input Terminal 2
Specifications
Open collector output
Complementary output (power
supply voltage 24V)
20V or more (voltage between JOG-
SD)
5V or less (voltage between JOG-
SD)
100kpps
2.5 s
2k (typ)/10mA(typ)
2
10m (0.75mm /twisted pair)
100m (output resistance 50 )
1/3750
Pulse train input
Terminal JOG FM output
Pulse train input FM output
Terminal JOG High speed pulse train output (50%Duty)
Pulse train input High speed pulse train output (50%Duty)
Terminal JOG High speed pulse train output (ON width is always same)
Pulse train input High speed pulse train output (ON width is always same)
High speed pulse train output (ON width is always same)
Pulse train input
The inverter outputs the pulse train input as it is
Pulse train input invalid
Indicates division scaling factor to the input pulse and the frequency
resolution to the input pulse changes according to the value.
Connection with a complementary output system
pulse generator
24V power
Connection with an open collector output system
pulse generator
Pull up resistance
*
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
recommended), connect an open collector output signal and power
supply using a pull up resistance. The reference of resistance value to
the wiring length is as in the table below.
Wiring
Length
Pull up resistance
Load current (for
*
reference)
Stray capacitances of the wiring greatly differ according to the cable
type and cable laying, the above maximum cable length is not a
guaranteed value.
When using a pull up resistance, check the permissible power of the
resistor and permissible load current of output transistor and use them
within a permissible range.
228
PARAMETER
A700
(A700)
Description
Pulse train output
Sink logic
Inverter
PC
JOG
2kΩ
SD
Sink logic
Inverter
PC
*
JOG
2kΩ
SD
Less than
10 to 50m
10m
Not necessary
1k
10mA 35mA
2
twisted cable is
50 to 100m
470
65mA