Detection Of Rotation Speed (Su, Fu Signal, Pr. 41 To Pr. 43, Pr. 870) - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

S-pm geared motor drive unit fr-d700-g series
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4.11.6 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
Name
Number
41
Up-to-speed sensitivity
42
Speed detection
Speed detection for reverse
43
rotation
870
Speed detection hysteresis
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 161.)

The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.

If a value exceeding the upper speed limit of the motor is set, the actual operation will be limited at the maximum rotation speed. The setting range is for
the S-PM motor. The maximum setting value differs depending on the number of poles of the applied motor.
Set speed
(r/min)
OFF
ON
SU
Forward
rotation
(r/min)
Output signal
OFF
ON
FU
Rotation speed
(r/min)
Pr. 42
OFF
ON
FU
ON
Example of rotation speed detection (FU) signal
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)
Function assignment of external terminal and control
Initial
Value
10%
180r/min
9999
15r/min
Adjustment
range Pr. 41
Time
OFF
Pr. 42
Time
Pr. 43
Reverse
rotation
OFF
OFF
ON
Pr. 870
OFF
ON
Refer to page 123.
Setting Range
0 to 100%
Level where the SU signal turns ON.
0 to 12000r/min /
Speed where the FU signal turns ON
0 to 8000r/min
Speed where the FU signal turns ON during reverse
0 to 12000r/min /
0 to 8000r/min
rotation.
9999
Same as Pr. 42 setting
0 to 150r/min /
Set the hysteresis width for the detected speed.
0 to 100r/min
(1)
Up-to-rotation speed sensitivity (SU signal, Pr. 41)
When the rotation speed reaches the set speed, the Up-to-
speed (SU) signal 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 (FU) signal 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 (SU)
signal and rotation speed detection (FU) signal may repeat ON/
OFF (chatter). Setting hysteresis to the detected speed
prevents chattering of these signals.
REMARKS
 Setting a higher value to this parameter slows the response
of Speed detection (SU and FU) signals.
Description
127
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