6. Control Functions and Parameter Settings
6-28
Block-C parameters (Extended function constants) list
Application
No.
Parameter
Unit
Default
Min.
Max.
Function
ST
V/f VEC PM
C24 – Speed detection error monitor
0
Overspeed protection
level
%
105.0
100.0
200.0
The overspeed protection operation
level is set.
1
Control mode change-
over during speed
detection error
1.
1.
3.
Select control at speed detection error
= 1 : Speed detection error not
monitored
= 2 : Speed detection error
monitored (Do not change to
sensor-less vector control)
= 3 : Speed detection error
monitored (Switch to sensor-
less vector control)
2
Speed detection error
level
%
10.0
1.0
100.0
3
Speed detection error
recovery level
%
5.0
1.0
100.0
The conditions for judging the speed
detection error are set.
Set as C24-2
≥
C24-3.
C25 – High-efficiency operation
0
Voltage reduction time
sec
1.0
0.1.
30.0
Set the time for the output voltage to
drop from the V/f setting value to 0V.
1
Voltage lower limit
setting value
%
100.
10.
100.
When selecting a high-efficiency
operation function, set 10 to 99.
C26 – Standard serial transmission setting
0
Parameter change
lock
1.
1.
5.
The parameters are shown in below
table
: Changeable
X: Lock
1
Station Number
1.
0.
32.
Set the station number
2
Response timer
sec
0.00
0.00
2.00
Set the minimum time for returning an
answer after receiving the command
Refer to instruction manual (PCST-3298)
Block B, C
Sett-
ing
value
Block
A
Basic
Ex-
tend
S/W
H/W
1
2
X
X
X
X
X
3
X
X
X
X
4
X
X
X
5
X
X
