Load Falls When Brake Is Applied; Excessive Current Occurs At Start; Excessive Output Current At Constant Speed; Too Much Output Current, Oscillation - YASKAWA CIPR-CR70A Series Technical Manual

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Load Falls When Brake Is Applied

Causes
The open/close timing of the brake is incorrect.
The DC injection braking is insufficient.
■

Excessive Current Occurs at Start

Causes
The brake sequence is not adjusted.
The motor flux build up is not enough while using Closed
Loop Vector Control or Advanced Open Loop Vector
Control.
Torque settings are too low while using Open Loop Vector
Control, Closed Loop Vector Control, or Advanced Open
Loop Vector Control.
The motor flux build up is not enough while using Closed
Loop Vector Control or Advanced Open Loop Vector
Control.
The motor flux build up is not enough while using Open
Loop Vector Control.
Initial motor excitation is not sufficient while using V/f
Control.
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Excessive Output Current at Constant Speed

Causes
The drive is not appropriate.
No-load current and rated slip values are not set
appropriately after running the Auto-Tuning process with
Open Loop Vector Control or Closed Loop Vector Control.
■

Too Much Output Current, Oscillation

Causes
Gain parameters do not agree with motor parameters while
using Open Loop Vector Control.
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
3 Startup Procedure and Test Run
Possible Solutions
• Increase the value set in S1-14 [Slip Prevention Frequency].
• Increase the time set in S1-15 [Slip Prevention Time].
Increase the value set in b2-02 [DC Injection Braking Current].
Possible Solutions
• 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.
• 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.
• Set L7-01 to L7-04 ≒ 150 [Torque Limit ≒ 150%].
• Set S1-07 ≒ 70 to 80 [Brake Release Torque (FWD) ≒ 70% to 80%].
• 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.
• 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%].
• Set E1-08 [Mid Point A Voltage] to around 20 V maximum (40 V for 400
V class drive).
• Set b2-03 = 0.2 to 0.3 [DC Inject Braking Time at Start = 0.2 s to 0.3 s].
• Set E1-08 [Mid Point A Voltage] to around 20 V maximum (40 V for 400
V class drive).
Possible Solutions
Confirm if the drive capacity is sufficient.
1. Confirm the values in the motor test report.
2. Set E2-03 [Motor No-Load Current] (E4-03 [Motor 2 Rated No-Load
Current] for motor 2) in accordance with test report values.
3. Set E2-02 [Motor Rated Slip] (E4-02 [Motor 2 Rated Slip] for motor 2)
to a value of 60% to 80% of the test report value.
Possible Solutions
• Make sure that motor parameters E2-xx are not too different than the
value in the test report. Do the Auto-Tuning process if it is not done.
• Increase the setting value of n2-01 [Automatic Freq Regulator Gain(F)]
in 0.05 increments.
• Increase the setting value of n2-02 [Automatic Freq Regulator Time 1] in
50 ms increments.
Note:
Always set n2-02 ≤ n2-03 [Automatic Freq Regulator Time 2].
Whenever n2-02 is adjusted, the value set for C4-02 [Torque
Compensation Delay Time] must also be increased according to the
same ratio.
• Increase the setting value of C4-02 [Torque Compensation Delay Time]
in 10 ms increments.
Note:
Always set C4-02 ≤ C4-06 [Motor 2 Torque Comp Delay Time].
Whenever C4-02 is adjusted, the value set for n2-02 [Automatic Freq
Regulator Time 1] must also be increased according to the same ratio.
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