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Digital Operator Display
Minor Fault Name
Load is too heavy.
• Measure the current flowing through the motor.
• Reduce the load or increase the capacity of the drive.
YES
Acceleration and deceleration times are too
short.
• Calculate the torque required during acceleration and for the inertia moment.
• 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).
• Increase the capacity of the drive.
A special-purpose motor is being used, or the
drive is attempting to run a motor greater than
the maximum allowable capacity.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity
range.
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-
oo
= 10) will only be triggered if H2-
oo
= 2F.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
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.
–
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-
oo
= 10) will only be triggered if H2-
oo
= 2F.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
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.
–
Digital Operator Display
Minor Fault Name
LT-3
Soft Charge Bypass Relay Maintenance Time
The DC bus soft charge relay is nearing the end of its expected performance life.
Note:
An alarm output (H2-
oo
= 10) will only be triggered if H2-
oo
= 2F.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
The DC bus soft charge relay has 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.
–
Digital Operator Display
Minor Fault Name
LT-4
IGBT Maintenance Time (50%)
IGBTs have reached 50% of their expected performance life.
Note:
An alarm output (H2-
oo
= 10) will only be triggered if H2-
oo
= 2F.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
IGBTs have reached 50% of their expected
performance life.
Check the load, carrier frequency, and output frequency.
–
Digital Operator Display
Minor Fault Name
oH
Heatsink Overheat
The temperature exceeded the value set to L8-02.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
6.5 Alarm Detection
286
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual