Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 240)

HOA Keypad Display Fault Name
FB10
No Drive Comms
Note: A fault reset is required. An EF0 is not sent to the drive and bypass contactor K3 is not
affected.
An unexpected loss of communication to the drive lasting longer than 15 seconds has been detected.
Cause Possible Solution
The cable between the bypass controller and the
drive is disconnected or has been damaged.
Verify the cable between the bypass controller board (A2) connector CN6 to drive terminal TB4 is
connected at both ends and is not damaged.
The bypass controller circuit has become
defective.
Replace the bypass control board.
The drive circuitry has become defective. Replace the drive.
HOA Keypad Display Fault Name
FB11
Bypass Board Hardware Error
Note: A fault reset is not required. An EF0 is not sent to the drive. The drive output contactor
K2 and bypass contactor K3 are opened.
The bypass control board failed.
Cause Possible Solution
An unexpected event occurred with the bypass
controller circuitry.
Replace the bypass controller board.
HOA Keypad Display Fault Name
FB12
Option Board Comms
Note: Fault reset will not remove the fault.
Loss of communication to the communication option board. This fault can only occur if the bypass
is programmed to be controlled by the option card (one or more of the following): Z1-07 = 3, Z1-08
= 2, Z1-38 = 2, or Z1-39 = 2.
Cause Possible Solution
Communication between the option card and
bypass board have timed out and communication
has stopped
Ensure the option card is mounted properly. Replace the option card and cycle power to the bypass
board.
HOA Keypad Display Fault Name
FB13
Loss of Load
Note: A fault reset is required. An EF0 fault is sent to the drive and drive output contactor
K2 and bypass contactor K3 are opened.
The conditions were such that it appears the motor has become disconnected from the load.
Cause Possible Solution
The motor is disconnect from the drive Check the continuity between the drive/bypass and the motor.
The load has been disconnected from the motor Check the belt/coupling between the motor and the load
The Loss of Load settings are not proper. Review and adjust the Loss of Load parameters Z1-31 to Z1-36.
HOA Keypad Display Fault Name
FB14
Serial Communications Fault
Note: A fault reset is required. Behavior of the drive and the contactors during an FB14 fault
is determined by parameter Z3-05.
Serial communications timeout
Cause Possible Solution
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.
6.4 Fault Detection
240 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual