Yaskawa AC Drive Z1000 User Manual
Page 221
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 to C1-04).
• 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.
The current level increased due to Speed Search
after a momentary power loss or while attempting
to perform a fault restart
The alarm will only appear briefly. There is no need to take action to prevent the alarm from occurring
in such instances.
HOA Keypad Display
Minor Fault Name
inTLK
Interlock Open
ALM LED will not blink
Cause
Possible Solutions
BAS Interlock multi-function input is open
Check the cause of interlock.
HOA Keypad 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 both (H2-oo = 2F and H2-
oo = 10) are set.
Cause
Possible Solutions
The cooling fan has reached 90% of its expected
performance life
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
HOA Keypad 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 Solutions
The main circuit and control circuit capacitors have
reached 90% of their expected performance lives
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
HOA Keypad 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 Solutions
The DC bus soft charge relay has reached 90% of
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.
HOA Keypad 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 Solutions
IGBTs have reached 50% of their expected
performance life
Check the load, carrier frequency, and output frequency.
HOA Keypad Display
Minor Fault Name
oH
Heatsink Overheat
The temperature of the heatsink exceeded the overheat pre-alarm level set to L8-02 (90-100 °C).
Default value for L8-02 is determined by drive capacity (o2-04).
Cause
Possible Solutions
5.5 Alarm Detection
YASKAWA ELECTRIC TOEP C710616 45E YASKAWA AC Drive – Z1000 User Manual
221
5
Troubleshooting