Specifications

YASKAWA Inverter Drive A1000 – Crane Software Application Manual
56
Problem Cause Corrective Action
The drive fails to accelerate despite Stall
Prevention During Accel being activated when
speed is lost during acceleration.
Brake Delay Time (S1-04) is too long
Accel Time setting is too short.
Shorten the Brake Delay Time (S1-04)
Increase the acceleration time.
Slipping occurs during an abnormally early
Inching Operation.
Drive Control / Brake Operation isn’t following
Inching Operations.
Increase the Run Command Minimum
On-Time (S2-01, -02).
Drives stops before an impact although Impact
Stop is enabled.
Impact Stop Detection Torque (S3-03, -04) is
too low.
Impact Stop Detection Time (S3-05) is too
short.
Increase Impact Stop Detection
Torque setting (S3-03, -04).
Increase the Impact Stop Detection Time
(S3-05)
At an Impact Stop, the drives keep operating
at the Clip Frequency (Fcr).
・
Impact Stop Detection Torque (S3-03, -04) is
set too high.
Motor torque fails to increase upon impact
Impact Stop Clip Time (S3-02) is too long
Lower the Impact Stop Detection
Torque setting (S3-03, -04).
Check the friction on the load side (wheel
slippage, etc).
Impact Stop Clip Time (S3-02) is too short.
Speed increases despite a heavy load during
Ultra Lift 1.
The value set in Ultra Lift 1 Detection Torque
(S4-04, -05) is too high
Ultra Lift 1Detection Time (S4-07) is too short.
Decrease the Ultra Lift Detection 1 Torque
(S4-04, -05) setting.
Increase the Ultra Lift 1 Detection Time
(S4-07).
Hoisting of light load does not accelerate,
although Ultra Lift 1 is enabled.
Ultra Lift 1 isn’t activating.
Ultra Lift 1 Detection Torque (S4-04, -05) is set
too low.
Mechanical loss is larger than Ultra Lift 1
Detection Torque (S4-05) when in reverse
Enable the Swift Lift 1 function.
See section 7.4, “Ultra Lift Function”.
Increase the setting value for the Ultra Lift 1
Detection Torque (S4-04, -05)
Adjust the Ultra Lift 1 Torque Bias (S4-19, -20).
See section 7.4.1 “Ultra Lift 1”
Fault OPE24 has occurred. Parameter setting error. See section 8
Fault OL6 has occurred. The accel time set to the drive is too short Increase the acceleration time.
Speed increases despite a heavy load during
Ultra Lift 2.
The Limit Starting Level / Hold Level (S4-09,
-10) is set too high.
Lower the Limit Starting Level / Hold Level
(S4-09, -10)
No acceleration when hoisting light loads,
although Ultra Lift 2 is enabled.
Ultra Lift 2 is not activating.
The Limit Starting Level / Hold Level (S4-09,
-10) is set too low.
Enable the Ultra Lift 2 function
See section 7.4.2 “Ultra Lift 2”.
Increase the Limit Starting Level / Hold Level
(S4-09, -10)