Avoid Mechanical Resonance Points (Frequency Jump); Speed Display And Speed Setting; Detection Of Output Frequency And Motor Speed - Mitsubishi Electric FR-A700 Manual

Pr.
Pr.
31 to 36

Avoid mechanical resonance points (frequency jump)

Pr.31 Frequency jump 1A
Pr.33 Frequency jump 2A
Pr.35 Frequency jump 3A
When it is desired to
avoid resonance
Pr.36
attributable to the
Pr.35
natural frequency of
Pr.34
a mechanical
Pr.33
system, these
parameters allow
Pr.32
resonant Pr.31
frequencies to be
jumped.
Up to three areas may be set, with the jump frequencies set to either
the top or bottom point of each area.
The value set to 1A, 2A or 3A is a jump point and operation in the
jump zone is performed at these frequencies.
Frequency jump is not performed if the initial value is set to "9999".
During acceleration/deceleration, the running frequency within the
set area is valid.
Pr.
Pr.
37, 144, 505, 811

Speed display and speed setting

Pr.37 Speed display
Pr. 505 Speed setting reference
The monitor display and frequency setting of the PU (FR-DU07/
FR-PU04/FR-PU07) can be changed to the motor speed and
machine speed.
When the running speed monitor is selected, each monitor and
setting are determined according to the combination of Pr.37 and
Pr.144. (The units within the thick frame are the initial values.)
Using Pr.811, the setting increments of running speed monitor and
speed setting (r/min) can be changed from 1r/min to 0.1 r/min.
Output
Pr.37 Pr.144
Frequency
Setting Setting
Monitor
0 Hz
2 to 10 Hz
0
102 to
r/min*1
110
0 Hz
1 to Machine
2 to 10
9998 speed*1
102 to
Hz
110
*1 Motor speed (r/min) conversion formula ... frequency
poles (Pr.144)
Machine speed conversion formula ......Pr.37
For Pr.144 in the above formula, the value is "Pr.144 - 100" when "102 to 110"
is set in Pr.144 and the value is "4" when Pr.37 =0 and Pr.144 =0.
*2 The increments for Hz are 0.01Hz, machine speed are 1m/min, and r/min are
1r/min.
*3 Running speed monitor displays actual motor speed (encoder) during
encoder feedback control and vector control.
47
When setting parameters, refer to the instruction manual (applied) and understand instructions.
Pr.32 Frequency jump 1B
Pr.34 Frequency jump 2B
Pr.36 Frequency jump 3B
Frequency jump
Pr.144 Speed setting switchover
Pr. 811 Set resolution switchover
Frequency
Set Running
Setting
Frequency Speed
Parameter
Monitor Monitor
Setting
Hz r/min*1 Hz
Hz r/min*1 Hz
r/min*1 r/min*1 r/min*1
Machine
Hz Hz
speed*1
Machine Machine Machine
speed*1 speed*1 speed*1
Hz r/min*1 Hz
×
120/number of motor
×
frequency/Pr. 505
Pr.
Pr.
41 to 43, 50, 116, 865

Detection of output frequency and motor speed

(SU, FU, FU2, FU3, FB, FB2, FB3, LS signal)
Pr.41 Up-to-frequency sensitivity
Pr.43 Output frequency detection for reverse rotation
Pr.116 Third output frequency detection
The inverter output frequency is detected and output at the output
signals.
The Pr.41 value can be adjusted within the range ±1% and ±100%
on the assumption that the set frequency is 100%.
This parameter can be used to ensure that the running frequency
has been reached to provide the operation start signal etc. for
related equipment.
Running frequency
OFF
ON
SU
When the output frequency reaches or exceeds the Pr.42 setting, the
output frequency detection signals (FU, FB) are output.
This function can be used for electromagnetic brake operation, open
signal, etc.
When the detection frequency is set in Pr.43, frequency detection for
reverse rotation use only can also be set. This function is effective
for switching the timing of electromagnetic brake operation between
forward rotation (rise) and reverse rotation (fall) during vertical lift
operation, etc.
When outputting a frequency detection signal besides the FU (FB)
signal, set the detection frequency in Pr.50 or Pr.116. The FU2 (FB2)
signal is output when the output frequency reaches or exceeds the
Pr.50 setting (FU3 (FB3) signal is output if reaches or exceeds the
Pr.116 setting).
Forward
rotation
Output
signal
OFF
ON
FU, FU2, FU3
(FB,FB2,FB3)
The FU (FU2 and FU3) signal is output when the output frequency
reaches the speed command value and output the FB (FB2, FB3)
signal when the output frequency reaches the actual motor speed
(estimated actual speed value) under real sensoreless vector control
and vector control.
(The output timing of the FU and FB signals is the same under V/F
control and advanced magnetic flux vector control.)
The LS signal is output when the output frequency reduces below the
Pr.865 setting under real sensorless vector control and vector control.
The signal is output during inverter operation under the following
conditions.
Pr.865
LS ON OFF
Pr.
Pr.
44, 45
Refer to the section about Pr. 7.
Pr.
Pr.
46
Refer to the section about Pr. 0.
Pr.
Pr.
47
Refer to the section about Pr. 3.
Pr. Pr.
48, 49
Refer to the section about Pr. 22.
Pr.
Pr.
50
Refer to the section about Pr. 41.
Pr.
Pr.
51
Refer to the section about Pr. 9.
Pr.42 Output frequency detection
Pr.50 Second output frequency detection
Pr.865 Low speed detection
Adjustment
range Pr.41
Time
OFF
Pr.42
Pr.50
Pr.116
Time
Reverse Pr.43
rotation
Pr.50
Pr.116
OFF OFF
ON
Time
ON