YASKAWA Z1000 - Page 234

HOA Keypad Display Fault Name
Faulty communication wiring or an existing short
circuit.
• Check for faulty serial communication wiring
• Correct the wiring
• Check for disconnected cables and short circuits and repair as needed.
Communication data error occurred due to noise.
• Check the various options available to minimize the effects of noise
• Counteract noise in the control circuit, main circuit, and ground wiring
• Use only recommended cables or other shielded line. Ground the shield on the controller side
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors
if required
• Separate all communication wiring from power lines. When the lines must cross, make the lines
cross at a right angle to minimize noise coupling.
Communication Error timeout time not set
properly.
Verify the setting of the serial communications fault time (Z3-06) is set properly.
Controller is not sending data soon enough to stop
the timeout.
Verify the scan rate in the controller that is communicating with the bypass controller is proper. Adjust
as necessary.
HOA Keypad Display Fault Name
FB15
<1>
Input Phase Loss
Cause Possible Solutions
Bypass Mode current unbalance condition
exceeded the unbalance level limit set by Z1-50 for
the amount of time specified in Z1-51.
• Check input wiring including fuses, breakers, and connections upstream from the bypass.
• Check the motor wiring and connections.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display Fault Name
FB16
<1>
Input Phase Rotation
Cause Possible Solution
Incorrect phase rotation while Z1-52 is set to 2 in
Bypass Mode.
Check the sequence (phase rotation) of the input wiring to the bypass package.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display Fault Name
FB17
<1>
Load Lost
Cause Possible Solution
Drive or bypass output current is less than 5% of
E2-01, Motor Rated Current, for longer than 10
seconds.
Close all external output disconnects.
• Verify that the frequency reference or PID ≠ 0.
• Set d2-02 > 0.0%.
<1> Available in bypass controller software versions VST800400 and later.
HOA Keypad Display Fault Name
FB18
<1>
K3 Welded
Cause Possible Solution
The bypass detected a welded K3 contactor
condition.
Inspect K3 contactor.
<1> Available in bypass controller software versions VST800400 and later.
HOA Keypad Display Fault Name
FB19
<1>
Duplicate Input
Cause Possible Solution
The bypass detected a duplicate digital input
selection.
Check for duplicate settings in parameters Z2-01 through Z2-08.
Note: Multiple settings of "0" are allowed and will not trigger this fault.
<1> Available in bypass controller software versions VST800400 and later.
HOA Keypad Display Fault Name
FB20
<1>
Fire Stat
Cause Possible Solution
6.4 Fault Detection
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YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual