6.5 Alarm Detectionu Alarm Codes, Causes, and Possible SolutionsAlarms are drive protection functions that do not necessarily cause the drive to stop. Once the cause of an alarm is removed,the drive will return to the same status is was before the alarm occurred.When an alarm has been triggered, the ALM light on the HOA keypad display blinks and the alarm code display flashes. If amulti-function output is set for an alarm (H2-oo = 10), that output terminal will be triggered<1>.Note: If a multi-function output is set to close when an alarm occurs (H2-oo = 10), it will also close when maintenance periods are reached,triggering alarms LT-1 through LT-4 (triggered only if H2-oo = 2F<1>).<1> Details on this function can be found in the standard Z1000 Programming Manual (SIEPC71061645) atwww.yaskawa.com.Table 6.9 Detailed Alarm Codes, Causes, and Possible SolutionsHOA Keypad Display Fault NameAL02 BAS Interlock OpenCause Possible SolutionThe digital input set to Bas interlock is open Check to see if the damper is functioning properly. The damper may be in the process of opening andthe end switch may not have closed.HOA Keypad Display Fault NameAL03 Smoke Purge in BypassNote: Also referred to as “Fireman's Override” (Bypass).Cause Possible SolutionSmoke Purge Bypass input is activated This is typically an intentional emergency run state. Check the Z2-oo digital input settings todetermine which is set to 25, then check to the physical digital input terminal DI-oo to determinewhy it is closed.HOA Keypad Display Fault NameAL04 Smoke Purge in DriveNote: Also referred to as “Fireman's Override” (Drive).Cause Possible SolutionSmoke Purge Drive input is activated This is typically an intentional emergency run state. Check the digital input settings (Z2-oo) todetermine which is set to 25. Then check to the physical digital input terminal DI-oo to determinewhy it is closed.HOA Keypad Display Fault NameAL13 Loss of LoadCause Possible SolutionThe conditions were such that it appears that themotor has been disconnected from the load. Replace the belt or coupling between the motor and the load. In the event of a false detection, reviewparameters Z1-27 to Z1-32 and set them to more appropriate values.HOA Keypad Display Fault NameAL14 Serial Comm FaultCause Possible SolutionFaulty communication wiring or an existing shortcircuit.• 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 suppressorsif required• Separate all communication wiring from power lines. When the lines must cross, make the linescross at a right angle to minimize noise coupling.Communication Error timeout time not setproperly. Verify the setting of the serial communications fault time (Z3-06) is set properly.6.5 Alarm Detection244 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
