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6.5 Alarm Detection
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
369
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Digital Operator Display
Minor Fault Name
Fdv
Power Supply Frequency Fault
The input power supply frequency exceeded the allowable frequency fluctuation.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
A momentary power loss occurred.
Reset the fault.
YES
An input power supply wiring terminal is loose.
Check for loose terminals.
The fluctuation in the voltage of the input power
supply is too large.
Increase the Power Supply Frequency Fault Detection Width (L2-27).
The built-in fuse is open.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
The phase rotation direction has changed in the input
power supply.
Correct the wiring.
The detected power supply frequency exceeded the
allowable value.
Improve the power supply.
Digital Operator Display
Minor Fault Name
Hbb
Safe Disable Signal Input
Both Safe Disable Input channels are open.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
Both Safe Disable Inputs H1 and H2 are open.
• Check signal status at the input terminals H1 and H2.
• Check the Sink/Source Selection for the digital inputs.
• If the Safe Disable function is not utilized, check if the terminals H1-HC, and H2-HC are linked.
YES
Internally, both Safe Disable channels are broken.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Digital Operator Display
Minor Fault Name
HbbF
Safe Disable Signal Input
One Safe Disable channel is open while the other one is closed.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
The signals to the Safe Disable inputs are wrong or
the wiring is incorrect.
Check signal status at the input terminals H1 and H2. If the Safe Disable function is not utilized, the terminals
H1-HC, and H2-HC must be linked.
YES
One of the Safe Disable channels is faulty.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Digital Operator Display
Minor Fault Name
HCA
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
Load is too heavy.
Either reduce the load for applications with repetitive operation (repetitive stops and starts, etc.), or use a larger
drive.
YES
Acceleration and deceleration times are too short.
• Calculate the torque required during acceleration and for the moment of inertia.
• If the torque level is not right for the load, take the following steps:
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Use a larger drive.
A special-purpose motor is being used, or the drive is
attempting to run a motor greater than the rated
output current.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the rated output current range.
The current level increased due to Speed Search after
a momentary power loss or while attempting to
perform a fault restart.
The alarm will appear only briefly. There is no need to take action to prevent the alarm from occurring in such
instances.
Digital Operator Display
Minor Fault Name
LT-1
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Note:
An alarm output (H2-
= 10) will only be triggered if both (H2-
= 2F and H2-
= 10) are set.
Cause
Possible Solutions
Minor Fault
(H2-01 = 2F)
The cooling fan has reached 90% of its expected
performance life.
Replace the cooling fan and reset the Maintenance Monitor by setting o4-03 to 0.
YES
Digital Operator Display
Minor Fault Name
LT-2
Capacitor Maintenance Time
The main circuit and control circuit capacitors are nearing the end of their expected performance life.
Note:
An alarm output (H2-
= 10) will only be triggered if H2-
= 2F.
Cause
Possible Solutions
Minor Fault
(H2-01 = 2F)
The main circuit and control circuit capacitors have
reached 90% of their expected performance life.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
YES
SIEP_C710636_02B_1_0.book 369 ページ 2015年11月25日 水曜日 午後4時56分