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3 Startup Procedure and Test Run
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Suspension Drops (Falls)
Causes
The V/f setting is too low.
Motor parameters are not adjusted while using Open Loop
Vector Control, Closed Loop Vector Control, or Advanced
Open Loop Vector Control.
The torque limit setting is too low while using Open Loop
Vector Control, Closed Loop Vector Control, or Advanced
Open Loop Vector Control.
■
Load Slips at Start
Causes
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.
The V/f setting is too low.
The setting value of C4-02 [Torque Compensation Delay
Time] is too high while using Open Loop Vector Control.
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.
The output current is more than 125% of the rated current
while using Closed Loop Vector Control or Advanced Open
Loop Vector Control.
The output current is more than 125% of the rated current
while using Open Loop Vector Control.
The output current is more than 125% of the rated current
while using V/f Control.
■
Load Slips at Stop
Causes
The setting value of S1-05 [Brake Release Current (FWD)]
is too low while using V/f control or OLV control.
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.
Brake hold settings are not correct.
■
Slipping Occurs During Extremely Fast Inching
Causes
Drive operation and brake operation do not keep up with
the inching operation.
210
Possible Solutions
Increase the V/f setting.
Do the motor Auto-Tuning process.
Increase the setting values of L7-xx [Torque Limit].
Possible Solutions
Increase the setting values of S1-05 to S1-08.
Increase the V/f setting.
Set C4-02 ≒ 20 [20 ms].
Set S1-09 ≒ 50 to 80 [50% to 80%].
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.
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).
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).
Possible Solutions
Increase the setting value of S1-15.
Set b2-04 > 0.50.
Increase the setting values of S1-12 [Brake Hold Frequency (FWD)] and
S1-13 [Brake Hold Frequency (REV)].
Possible Solutions
Increase the setting value of S2-01 [Run Cmd Minimum On Time (FWD)]
and S2-02 [Run Cmd Minimum On Time (REV)].
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
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