Yaskawa AC Drive Z1000 Bypass Technical Manual User Manual
Page 232
One of the motor cables has shorted out or there is
a grounding problem
• Check the motor cables.
• Remove the short circuit and reapply power to the drive.
• Check the resistance between the motor cables and the ground terminal .
• Replace damaged cables.
The load is too heavy
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity drive if the current value exceeds the rated current.
• Determine if there is sudden fluctuation in the current level.
• Reduce the load to avoid sudden changes in the current level or switch to a larger drive.
The acceleration or deceleration times are too short
Calculate the torque needed during acceleration relative to the load inertia and the specified
acceleration time. If it is not possible to set the proper amount of torque, make the following changes:
• Increase the acceleration time (C1-01)
• Increase the S-curve characteristics (C2-01 and C2-02)
• Increase the capacity of the drive.
The drive is attempting to operate a specialized
motor or a motor larger than the maximum size
allowed
• Check the motor capacity.
• Ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on
the motor nameplate.
Magnetic contactor (MC) on the output side of the
drive has turned on or off
Set up the operation sequence so the MC does not trip while the drive is outputting current.
V/f setting is not operating as expected
• Check the ratios between the voltage and frequency.
• Lower the voltage if it is too high relative to the frequency.
Excessive torque compensation
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
Drive fails to operate properly due to noise
interference
• Review the possible solutions provided for handling noise interference.
• Review the section on handling noise interference on page
and check the control circuit lines,
main circuit lines, and ground wiring.
Overexcitation gain is set too high
• Check if the fault occurs simultaneously with overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
Run command was applied while motor was
coasting
Set b3-01 to 1 to enable Speed Search at Start.
The rated output current of the drive is too small Use a larger drive.
HOA Keypad Display
Fault Name
oFA00
Option Card Connection Error at Option Port CN5
Option compatibility error
Cause
Possible Solution
The option card installed into port CN5 is
incompatible with the drive
Check if the drive supports the option card to be installed. Contact Yaskawa for assistance.
HOA Keypad Display
Fault Name
oH
Heatsink Overheat
The heatsink temperature exceeded the overheat pre-alarm level set to L8-02. The default value for
L8-02 is determined by drive capacity (o2-04).
Cause
Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive. Verify temperature is within drive specifications.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency (C6-02).
External cooling fan is stopped
Refer to Cooling Fan Replacement: 2A0011 to 2A0059, 4A0005 to
.
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
HOA Keypad Display
Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive
capacity (o2-04).
6.4 Fault Detection
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YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual