110
Function assignment of external terminal and control
4.10.6 Detection of rotation speed (SU, FU signal, Pr. 41 to Pr. 43, Pr. 870)
The drive unit rotation speed is detected and output at the output signals.
Parameter
Number
Name
Initial
Value
Setting Range Description
41 Up-to-speed sensitivity
10% 0 to 100% Level where the SU signal turns ON.
42 Speed detection
180r/min
0 to 12000r/min/
0 to 8000r/min∗1∗2
Speed where the FU signal turns ON
43
Speed detection for reverse
rotation
9999
0 to 12000r/min/
0 to 8000r/min∗1∗2
Speed where the FU signal turns ON during reverse
rotation.
9999 Same as Pr. 42 setting
870 Speed detection hysteresis
15r/min
0 to 150r/min/
0 to 100r/min∗1
Set the hysteresis width for the detected speed.
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 144)
∗1 Differs according to capacities. (0.2K to 2.2K/3.7K)
∗2 If a value exceeding 3000r/min is set, the actual rotation speed will be limited at 3000r/min.
(1) Up-to-rotation speed sensitivity (SU signal, Pr. 41)
When the rotation speed reaches the set speed, the up-to-
speed signal (SU) is output.
The Pr. 41 value can be adjusted within the range 0% to ±100%
on the assumption that the set speed is 100%.
This parameter can be used to ensure that the rotation speed
has been reached to provide the operation start signal etc. for
related equipment.
When using the SU signal, set "1 (positive logic) or 101
(negative logic)" in Pr. 190 or Pr. 192 (output terminal function
selection) to assign function to the output terminal.
(2) Rotation speed detection (FU signal, Pr. 42, Pr. 43)
The rotation speed detection signal (FU) is output when the
rotation speed reaches or exceeds the Pr. 42 setting.
Speed detection that is dedicated to the reverse operation can
be set by setting detection speed to Pr. 43.
When Pr. 43 ≠ "9999", the Pr. 42 setting is used for forward
rotation and the Pr. 43 setting is used for reverse rotation.
When using the FU signal, set "4 (positive logic)" or "104
(negative logic)" to Pr. 190 or Pr. 192 (output terminal function
selection) to assign the function to the output terminal.
(3) Speed detection hysteresis (Pr. 870)
This function prevents chattering of the speed detection
signals.
When the rotation speed fluctuates, the up-to-speed signal
(SU) and rotation speed detection signal (FU) may repeat ON/
OFF (chatter). Setting hysteresis to the detected speed
prevents chattering of these signals.
REMARKS
All signals are OFF during DC injection brake.
NOTE
Changing the terminal assignment using Pr. 190, Pr. 192 (output terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
Parameters referred to
Pr. 190, Pr. 192 (output terminal function selection) (Refer to page 106)
(r/min)
ON
Set speed Adjustment
range
Pr. 41
SU
Time
Rotation speed
OFF
OFF
Output signal
Forward
rotation
Reverse
rotation
Time
ON ON
OFF OFFOFF
FU
Pr. 43
Pr. 42
(r/min)
Rotation speed
Pr. 870
Pr. 42
Rotation speed
(r/min)
ON
ON
ON
FU
OFF OFF
Example of rotation speed detection signal (FU)
REMARKS
Setting a higher value to this parameter slows the response
of speed detection signals (SU and FU).
