YASKAWA CR700, Техническое руководство, Страница: 231 / 886

Startup
Procedure
and
Test
Run
3
3.11 Problems that Can Frequently Occur during Setup and Possible Solutions
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 231
◆
Drive Frequency Reference Differs from the Controller Frequency Reference
Command
Causes Possible Solutions
The analog input gain and bias for the frequency reference input are set to
incorrect values.
Check the gain and bias settings for the analog inputs that are used to set the frequency reference.
• Terminal A1:
H3-03 [Terminal A1 Gain Setting]
,
H3-04 [Terminal A1 Bias Setting]
• Terminal A2:
H3-11 [Terminal A2 Gain Setting]
,
H3-12 [Terminal A2 Bias Setting]
• Terminal A3:
H3-07 [Terminal A3 Gain Setting]
,
H3-08 [Terminal A3 Bias Setting]
Frequency bias signals are being entered via analog input terminals A1 to A3
and the sum of all signals builds the frequency reference.
• Check whether two or more of H3-02, H3-10, H3-06 [MFAI Function Selection] have a
setting value of 0 , and change the settings if necessary.
• Check if the analog input values set to terminals A1, A2, and A3 are appropriate using U1-13
to U1-15 [Terminal A1, A2, A3 Level] .
During low speed operation the motor rotates faster than the frequency
reference.
Decrease the value set in n4-70 [Speed Command Comp @ Low Freq] .
◆
Large Inconsistency in Stopping Position Due to the Load Rate
Causes Possible Solutions
The deceleration is inconsistent because of the Stall Prevention during
Deceleration function.
Extend deceleration up until the Stall Prevention function no longer operates.
◆
Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
Causes Possible Solutions
The stall prevention during deceleration setting is incorrect. • Examine the setting for
L3-04 [Decel Stall Prevention Selection]
.
• When the drive has a dynamic braking option installed, set
L3-04 = 0 [Disabled]
.
• If the drive detects
ov [Overvoltage]
, set
L3-04 = 3 [General Purpose w/ DB resistor]
.
The deceleration time setting is too long. Set C1-02, C1-04, C1-06, or C1-08 [Deceleration Times] to applicable values.
The motor torque is not sufficient. Use a larger motor.
Note:
If these items are correct, the demand on the motor is more than the motor capacity:
• Parameter settings are correct.
• The drive does not detect ov [Overvoltage] .
The drive and motor system reached the torque limit. • Examine the values set in L7-01 to L7-04 [Torque Limit] and increase them if necessary.
Note:
If the torque limit is enabled, deceleration time can increase because the drive cannot output
more torque than the limit.
• If H3-02, H3-10, H3-06 = 10, 11, 12, 15 [MFAI Function Select = Torque Limit] has been set,
examine the settings for the MFAIs.
• Examine the values set in H3-02, H3-10, and H3-06 .
• Use U1-13 to U1-15 [Terminal A1, A2, A3 Input Voltage] to make sure that the analog
input values set to terminals A1, A2, and A3 are applicable.
The load is more than the internal torque limit as specified by the drive rated
current.
Replace the drive with a larger capacity model.
◆
The Motor Rotates after the Drive Output Is Shut Off
Causes Possible Solutions
DC Injection Braking is too low and the drive cannot decelerate correctly. • Increase the value set in b2-02 [DC Injection Braking Current] .
• Increase the value set in b2-04 [DC Inject Braking Time at Stop] .
The stopping method makes the drive coast to stop. Set
b1-03 = 0 or 2 [Stopping Method Selection = Ramp to Stop, DC Injection Braking to Stop]
.
◆
Suspension Drops (Falls)
Causes Possible Solutions
The V/f setting is too low. Increase the V/f setting.
Motor parameters are not adjusted while using Open Loop Vector Control,
Closed Loop Vector Control, or Advanced Open Loop Vector Control.
Do the motor Auto-Tuning process.
The torque limit setting is too low while using Open Loop Vector Control,
Closed Loop Vector Control, or Advanced Open Loop Vector Control.
Increase the setting values of L7-xx [Torque Limit] .