Symbols
Table 5.3-23 lists the meanings of symbols used in Figure 5.3-18.
Table 5.3-23 Symbols Meaning
Symbol Name
Function
code
Descriptions
S point Start point J74, J75 This specifies the start position data for the positioning control. It can be the current
position [P] (absolute position) or numerical value (relative position). Specification of an
absolute position and that of a relative position produce different results as described
below.
[Absolute position]
Specifying [P] regards the current position as a start point. When starting the positioning
control, the inverter applies the current position pulse count as start point data.
(Example) Suppose that the current position pulse count = 10,000, the start point data
= [P], and the stop point (E point) pulse count = 20,000.
Then, when starting the positioning control, the inverter moves the control object from the
current position (10,000, as start point data) to the E point (20,000). Accordingly, the
object moving pulse count is 10,000 (20,000 - 10,000).
[Relative position]
Specifying “a” (numerical value) substitutes “a” for the current position data. When
starting the positioning control, the inverter applies “a” pulses as start point data.
(Example) Suppose that the current position pulse count = 10,000, start point data “a” =
4,000, and the stop position (E point) pulse count = 20,000.
Then, when starting the positioning control, the inverter moves the control object from the
start point pulse count “a” (4,000) instead of the current position data (10,000) to the E
point (20,000). Accordingly, the object moving pulse count is 16,000 (20,000 - 4,000).
ST Start timer J73 This specifies the waiting time from when a run command comes ON with the “S/R”
terminal command being ON until the inverter starts running the motor. (This covers the
delay of brake release.)
If the output frequency has not been zero (inverter running), turning the terminal
command “S/R” ON does not start the timer count. (During deceleration triggered by
turning the run command OFF, the start timer does not start neither.)
Z point Preset position
J76, J77 When the inverter detects that the Z signal is turned from Low to High first after the “LS”
terminal command is turned from OFF to ON, it corrects the current position data for the
preset position data (Z point). This is functionally equivalent to a mechanical position
correction or origin point reset.
Specifying [P] to the preset position does not perform the Z point correction.
It is also possible to restrict the application of the Z point correction with the “LS” to the
motor rotational direction specified by function code J87.
L Creep speed
switch point
J78, J79 These parameters specify the deceleration start point towards the creep speed (specified
by J80) as an absolute position.
CP Coasting
correction
J85 These parameters specify the deceleration start point that follows the end of creep speed
operation as a pulse count (relative position) from the E point.
Take into account the inertia produced when the control object decelerates to stop.
E point End point J81, J82 This specifies a target stop position.
ER Completion
range
J83 This specifies the positioning completion range at the E point, that is, “Actual stop
position - E point position.”
After the end timer counts up:
If “| Actual stop point - E point |” ≤ ER, the inverter issues the “Positioning completed”
signal “PSET”.
If “| Actual stop point - E point |” > ER, the inverter issues the “Stop point alarm” signal
“
”.
ET End timer J84 This specifies the waiting time from when the control object stops at E point until the
inverter can receive the next positioning control signal.
After completion of positioning, when this waiting time has elapsed or when 0.5 second
has elapsed if ET < 0.5 second, the inverter issues the “Positioning completed” signal
“PSET” or “Stop point alarm” signal “OT”.
Turning the run command OFF when the ET is counting interrupts the counting, so the
inverter does not issue “PSET” or “OT”.
The inverter ensures that “PSET” and “OT” signals are kept ON for at least 100 ms.
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