3.11 Problems that Can Frequently Occur during Setup and Possible Solutions
232
YASKAWA
SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
◆
Load Slips at Start
Causes
Possible Solutions
The setting values of
S1-05 [Brake Release Current (FWD)]
,
S1-06 [Brake
Release Current (REV)]
,
S1-07 [Brake Release Torque (FWD)]
, and
S1-08
[Brake Release Torque (REV)]
are too low.
Increase the setting values of
S1-05 to S1-08
.
The V/f setting is too low.
Increase the V/f setting.
The setting value of
C4-02 [Torque Compensation Delay Time]
is too high
while using Open Loop Vector Control.
Set
C4-02
≒
20 [20 ms]
.
The setting value of
S1-09 [Torque Compensation (FWD)]
(the amount of
torque forcing) is too low while using Open Loop Vector Control, Closed
Loop Vector Control, or Advanced Open Loop Vector Control.
Set
S1-09
≒
50 to 80 [50% to 80%]
.
The output current is more than 125% of the rated current while using
Closed Loop Vector Control or Advanced Open Loop Vector Control.
Do these procedures to solve problems with starting up magnetic flux.
•
Set
b2-03 = 0.2 to 0.3 [DC Inject Braking Time at Start = 0.2 s to 0.3 s]
.
•
Set
d6-03 = 1 [Field Forcing Selection = Enabled]
and
d6-06 = 200 to 400 [Field Forcing
Limit = 200% to 400%]
.
•
Do the initial excitation process.
The output current is more than 125% of the rated current while using Open
Loop Vector Control.
Do these procedures to solve problems with starting up magnetic flux.
•
Set
b2-03 = 0.2 to 0.3 [DC Inject Braking Time at Start = 0.2 s to 0.3 s]
.
•
Set
b2-08 = 100 to 200 [Magnetic Flux Compensation Value = 100% to 200%]
.
•
Increase the setting value of
E1-08 [Mid Point A Voltage]
to around 20 V maximum (40 V for
400 V class drive).
The output current is more than 125% of the rated current while using V/f
Control.
Do these procedures to solve problems with starting up magnetic flux.
•
Set
b2-03 = 0.2 to 0.3 [DC Inject Braking Time at Start = 0.2 s to 0.3 s]
.
•
Increase the setting value of
E1-08 [Mid Point A Voltage]
to around 20 V maximum (40 V for
400 V class drive).
Note:
Refer to
“
Magnetic Flux Compensation (Start-up Current Suppression)
”
on page
to solve problems in flux build up.
◆
Load Slips at Stop
Causes
Possible Solutions
The setting value of
S1-05 [Brake Release Current (FWD)]
is too low while
using V/f control or OLV control.
Increase the setting value of
S1-15
.
The setting value of
b2-04 [DC Inject Braking Time at Stop]
is too low while
using Closed Loop Vector Control or Advanced Open Loop Vector Control.
Set b2-04 > 0.50.
Brake hold settings are not correct.
Increase the setting values of
S1-12 [Brake Hold Frequency (FWD)]
and
S1-13 [Brake Hold
Frequency (REV)]
.
◆
Slipping Occurs During Extremely Fast Inching
Causes
Possible Solutions
Drive operation and brake operation do not keep up with the inching
operation.
Increase the setting value of
S2-01 [Run Cmd Minimum On Time (FWD)]
and
S2-02 [Run Cmd
Minimum On Time (REV)]
.
◆
Load Falls When Brake Is Applied
Causes
Possible Solutions
The open/close timing of the brake is incorrect.
•
Increase the value set in
S1-14 [Slip Prevention Frequency]
.
•
Increase the time set in
S1-15 [Slip Prevention Time]
.
The DC injection braking is insufficient.
Increase the value set in
b2-02 [DC Injection Braking Current]
.
◆
Excessive Current Occurs at Start
Causes
Possible Solutions
The brake sequence is not adjusted.
•
Decrease the setting values of
S1-01 and S1-02 [Brake Release Frequency]
.
•
Decrease the setting value of
S1-03 [Brake Delay Frequency]
.
•
Set
S1-04 [Brake Delay Time]
to align with the machine.
The motor flux build up is not enough while using Closed Loop Vector
Control or Advanced Open Loop Vector Control.
•
Set
d6-03 = 1 [Field Forcing Selection = Enabled]
and
d6-06
≒
200 to 400 [Field Forcing
Limit
≒
200% to 400%]
.
•
Do the initial excitation process.
Torque settings are too low while using Open Loop Vector Control, Closed
Loop Vector Control, or Advanced Open Loop Vector Control.
•
Set
L7-01 to L7-04
≒
150 [Torque Limit
≒
150%]
.
•
Set
S1-07
≒
70 to 80 [Brake Release Torque (FWD)
≒
70% to 80%]
.
Summary of Contents for CR700
Page 1: ......
Page 244: ...3 13 Test Run Checklist 244 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 422: ...7 7 Storage Guidelines 422 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 426: ...8 2 Disposal Instructions 426 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 837: ...EZZ023535 2 35 1 Revision History Revision Revised Content Date First Edition 2017 08 ...
Page 872: ...EZZ023536 2 16 Revision History Revision Revised Content Date First Edition 2017 08 ...