Mitsubishi Electric FR-A700 Technical Manual page 77

1.4.19 Detection of output frequency (SU, FU, FU2
common
(common)
[Pr. ] Name
41 Up-to-frequency sensitivity
42 Output frequency detection
Output frequency detection
43
for reverse rotation
Second output frequency
50
detection
Third output frequency
116
detection
865 Low speed detection
(1) Up-to-frequency sensitivity (SU)
When the output frequency reaches the running
frequency, the up-to-frequency signal (SU) is output.
The [Pr. 41] value can be adjusted within the range
1% to 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.
Set frequency
OFF
ON
SU
(2) Low speed detection (LS)
The low speed detection signal (LS) is output when
the output frequency decreases below the [Pr. 865]
setting.
When speed control is performed by Real sensorless
vector control or vector control, a fault (E.OLT) is
displayed and the inverter output is stopped if
frequency drops to the [Pr. 865] setting by torque limit
operation and the output torque exceeds [Pr. 874 OLT
level setting] and remains for more than 3s.
For the LS signal, set 34 (positive logic) or 134
(negative logic) in [Pr. 190 to Pr. 196 Output terminal
function selection] and assign functions to the output
terminal.
(*FU2, FU3, FB, FB2, FB3, LS are not available for
Initial Setting
Value Range
10% 0 to 100% Set the level where the SU signal turns ON.
Set the frequency where the FU (FB) signal
6Hz 0 to 400Hz
turns ON.
Set the frequency where the FU (FB) signal
0 to 400Hz
9999 turns ON in reverse rotation.
9999 Same as [Pr. 42] setting
Set the frequency where the FU2 (FB2) signal
30Hz 0 to 400Hz
turns ON.
Set the frequency where the FU3 (FB3) signal
60Hz 0 to 400Hz
turns ON.
Set the frequency where the LS signal turns
1.5Hz 0 to 400Hz
ON.
common
Adjustment
range [Pr.41]
Time
OFF
A700
70
* * *
, FU3 , FB
(*FU3, FB, FB2, FB3, LS are not available for
Description
[Pr.865]
LS ON
*1 The output frequency to be compared with the set
frequency at the SU signal and LS signal differs
according to the control method.
Control Method
common
V/F control
Simple magnetic flux vector control
,
F700
Advanced magnetic flux vector control
A700
Real sensorless vector control
Encoder feedback control
or vector control
A700
SPECIFICATIONS
* * *
, FB2 , FB3 , LS )
E700
Available Inverters
A700 F700
—
OFF ON
Compared Output
Frequency
Output frequency
Output frequency before slip
compensation
Frequency (actual motor
A700
speed) estimated value
Value of actual motor rotation
A700
represented in terms of
frequency setting
.)
F700
.)
D700
E700
D700
—
Time