Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 243)

HOA Keypad Display Fault Name
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.
• Set parameters E1-04 through E1-10 appropriately.
• 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
271 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.
• Program the Speed Search command input through one of the multi-function contact input terminals
(H1-oo = 61 or 62).
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-A
Option compatibility error
Cause Possible Solution
The option card installed into port CN5-A 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
oFA01
Option Card Fault at Option Port CN5-A
Option not properly connected
Cause Possible Solution
The option card connection to port CN5-A is faulty
• Turn off the power and reconnect the option card.
• Check if the option card is properly plugged into the option port. Make sure the card is fixed
properly.
HOA Keypad Display Fault Name
oFA03 to oFA06
Option Card Error Occurred at Option Port CN5-A
oFA10, oFA11
oFA12 to oFA17 Option Card Connection Error (CN5-A)
oFA30 to oFA43 Communication Option Card Connection Error (CN5-A)
Cause Possible Solution
6.4 Fault Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 243
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Diagnostics & Troubleshooting