Setting Frequency Command By Pulse Input - Hitachi WJ Series User Manual

Chapter 9
9.2.8

Setting Frequency Command by Pulse Input

 How to set the frequency command using an open collector pulse input?
Q
 To set the output frequency command using a pulse input from the [PLA] terminal, set the
A
"Frequency input source selection [A001]
"Pulse input, target function selection [P003]" to "Pulse input frequency command (00)" and the
"Simple positioning selection [P012]" to "Simple positioning disabled (00)".
 Set the input pulse frequency, that makes the frequency command equivalent to the "Maximum
frequency [A004]
 The pulse input value can be monitored using "Pulse input [PLA] monitor [d133]".
 The analog input start/end function cannot be used. To limit the pulse input frequency
!
command, set the "Pulse frequency bias value [P057]", the "Pulse upper frequency detection
level [P058]", and the "Pulse lower frequency detection level [P059]".
 Trying to stop the inverter by setting the pulse input frequency to 0 Hz may cause the
deceleration to stall. In such a case, turn off the RUN command to stop the inverter.
 If the pulse input frequency falls to or below the "Pulse lower frequency detection level [P059]",
it is treated as if the input is set to 0 Hz.
 If the "Pulse lower frequency detection level [P059]" setting is too high, start-up may be too
slow.
Code
[d133] Pulse input [PLA] monitor
Frequency input source
*1
[A001]
selection
Pulse input, target
[P003]
function selection
Simple positioning
[P012]
selection
[P055] Pulse frequency scale
Pulse frequency filter time
[P056]
constant
Pulse frequency bias
[P057]
value
Pulse upper frequency
[P058]
detection level
Pulse lower frequency
[P059]
detection level
◼ Pulse command frequency processing block diagram
Pulse input [PLA] monitor [d133]
(0.00 to 100.00%)
Hz
Pulse frequency
acquisition
Pulse frequency scale G
[P055] (1.0 to 32.0 kHz)
*1. "2nd-motor control [SET]" target parameter. The second control parameter is also subject to setting.
*1
", in the "Pulse frequency scale [P055]".
Item
Monitors the pulse frequency from the [PLA]
terminal as a percentage with [P055]
indicating a value of 100%. This monitor
continuously operates regardless of all other
settings.
Used to set the pulse input as the frequency
command input source.
Used to set the pulse input as the frequency
command input source.
Used to set the pulse input as the frequency
command input source.
Enter the pulse frequency that is equivalent to
the maximum frequency.
Filters the pulse frequency input.
Applies a bias to the pulse frequency input.
Limits the output of the pulse frequency input.
Sets the pulse value to 0.0% when the output
of the pulse frequency input falls to or below
the set lower limit.
%
1
1
1+sT
G
Filter time
constant T [P056]
Upper limit [P058]
(0.01 to 2.00 s)
(0 to 100%)
9-2-13
*1 " to "Pulse input (06)".
Description
Bias/Upper limit/Lower limit
100(%)
[P058]
Outp
ut
Bias
[P059]
0(%)
0(%) Input 100(%)
Lower limit [P059]
(0.01 to 20.00%)
Inverter Functions
At the same time, set the
Data
0.00 to 100.00 (%)
06
00
00
1.0 to 32.0 (kHz)
0.01 to 2.00 (s)
-100 to 100 (%)
0 to 100 (%)
0.01 to 20.00 (%)
Bias [P057]
(-100 to +100%)
Frequency command unit
%
Frequency
×
command
Maximum
frequency
*1
[A004]