Hitachi SJ Series, User Manual

Page: 382 / 786

12-17-21
Chapter 12 Inverter Functions
Position Bias Function
• Used to apply a bias to the position command for
the pulse train position control.
• Add/subtract the set number of pulses to the
change amount every 1 ms. Used to adjust the
phase of the synchronization point during the
synchronous operation, etc.
• Set the bias amount to the [AE-08] position bias
amount.
• Assign either 074(PUP) or 075(PDN) of the input
terminal function.
The bias amount is added while the PUP terminal is
on and is subtracted while the PDN terminal is on.
Detecting Excessive Position Deviation
• When the [bb-87] abnormal position deviation time
passes with the deviation of the position feedback
against the position command exceeding the
[bb-86] abnormal position deviation detecton level,
it is determined to be abnormal.
• The position deviation can be checked with the
[dA-26] pulse train position deviation monitor.
Speed Bias Function
• The function to apply a speed command bias when
the pulse train position control is performed.
• Set the bias amount to the [AA106] adding
frequency setting.
• Assign 014(ADD) to any of the input terminal
function. The bias amount is added/subtracted to
the speed command while the ADD terminal is on.
• When the behavior of the abnormal position
deviation [bb-85] is 00, the output terminal [PDD] is
turned on.
• When the behavior of the abnormal position
deviation [bb-85] is 01, the output terminal [PDD] is
turned on and there is a trip with the [E106] position
deviation error.
• The position deviation is cleared with on/off of the
input terminal 072[PCLR] position deviation clear or
the trip reset.
A
A
A
Position
deviation
Output terminal
function [PDD]
bb-87
0
bb-87
bb-88 bb-88
bb-88
Position command change
amount
Position feedback
change amount
AE-08
Position
control
Speed feedback value
Speed
control
AA106
ADD
terminal
Position bias
Speed Bias (signed)
PUP terminal/
PDN terminal
+/-
Plus at PUP terminal
Minus at PDN terminal
Upper/lower
limiter