Yaskawa AC Drive Z1000 AC Drive Bypass for HVAC - Manual (Page 20)

i.5 New and Modified Faults and Alarms
u New Faults and Alarms
Note: Faults and alarms in this section are added in bypass controller software version VST800298.
HOA Keypad Display Minor Fault Name
AL16 Input Phase Rotation
Cause Possible Solution
Incorrect phase rotation while Z1-52 is set to 1 in
Bypass Mode.
Check the sequence (phase rotation) of the input wiring to the bypass package.
HOA Keypad Display Fault Name
FB15 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, connections, upstream from the bypass.
• Check the motor wiring and connections.
HOA Keypad Display Fault Name
FB16 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.
u Modified Fault
HOA Keypad Display Fault Name
CE MEMOBUS/ Modbus Communication Error
Cause Possible Solution
Communications between the bypass controller
and the drive have stopped for longer than 2
seconds.
Note: Added in bypass controller software
version VST800298.
Check the communication cable, terminal CN6 on the bypass board, and terminals R+, R-, S+, and
S- on the drive terminal strip.
Note: This fault may also occur when the bypass is initialized by setting Z1-01 to 1, 2, or 3.
Cycle power on the bypass to clear.
i.5 New and Modified Faults and Alarms
20 YASKAWA TOEP YAISUP 06A YASKAWA AC Drive – Z1000 Bypass Manual Supplement