3.10 Crane Application Setup Procedure
YASKAWA
SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
209
■
Description of Operation
S4-02 - Light-load 1 Max. Freq(FWD)
S4-03 - Light-load 1 Max. Freq(REV)
S4-04
- Light-load 1 Detect Torque (FWD)
S4-05
- Light-load 1 Detect Torque (REV)
S4-06 - Light-load 1 Detect Frequency
S4-07 - Light-load 1 Detect Time
*1
Sets the motor rating as the base value.
1. When Light-load Acceleration 1 is enabled, if a frequency reference is entered that is higher than
S4-06
, then
the drive will accelerate up to the frequency set in
S4-06
. The drive will check the load (by comparing the
drive torque reference with
S4-04/S4-05
) after 1/3 of the time set in
S4-07
passes.
2. If the drive torque reference (or output current when using V/f Control) continues to be less than
S4-04/S4-05
for 2/3 of the time set in
S4-07
, then it will re-accelerate the motor (Light-load Acceleration) and operate at
either the frequency reference or
S4-02/S4-03
, whichever is lower.
3. If the drive torque reference (or output current when using V/f Control) is great than
S4-04/S4-05
, then it will
operate at the frequency reference set in
S4-06
. Afterwards, the drive will not re-accelerate (Light-load
Acceleration), no matter how low the torque reference is.
Light-load Acceleration is reset under the following conditions. After resetting Light-load Acceleration, the drive
will not accelerate until performing the load check described above.
•
When the Run command is switched OFF
•
When the frequency reference ≤
S4-06
•
When a fault occurs
•
When the reverse Run command is entered
•
When the External baseblock command is entered
■
Adjusting Light-load Acceleration 1 Torque Bias
When lowering the load (reverse), the drive may not perform Light-load Acceleration even if the load is lighter
than the detection torque set in
S4-05
because of the mechanical loss applied to the crane. In such cases, adjust
S4-
20 [Light-load 1 Torque Bias (REV)]
while referring to the following table.
When hoisting the load (forward), it is possible to skip adjustment of
S4-19 [Light-load 1 Torque Bias (FWD)]
by
adding the degree of mechanical loss to the detection torque set in
S4-04
.
The drive may not perform Light-load Acceleration with the same load because the torque reference value for the
drive will change because of the effect of changes in motor temperature. Set parameters considering a 5% to 7%
margin.
Note:
S4-19/S4-20
are enabled when
A1-02 = 2, 4 [Control Method Selection = Open Loop Vector, Advanced Open Loop Vector]
.
Содержание CR700
Страница 1: ......
Страница 2: ...This Page Intentionally Blank 2 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 244: ...3 13 Test Run Checklist 244 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 422: ...7 7 Storage Guidelines 422 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 426: ...8 2 Disposal Instructions 426 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 837: ...EZZ023535 2 35 1 Revision History Revision Revised Content Date First Edition 2017 08 ...
Страница 872: ...EZZ023536 2 16 Revision History Revision Revised Content Date First Edition 2017 08 ...