Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 251)

6.5 Alarm Detection
u Alarm Codes, Causes, and Possible Solutions
Alarms 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 a
multi-function output is set for an alarm (H2-oo = 10), that output terminal will be triggered.
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-3 (triggered only if H2-oo = 2F).
Table 6.9 Alarm Codes, Causes, and Possible Solutions
HOA Keypad Display Minor Fault Name
AEr
Station Address Setting Error (CC-Link, CANopen, MECHATROLINK)
Option card node address is outside of the acceptable setting range.
Cause Possible Solutions
Station number is set outside the possible setting
range.
Set parameters to the proper values when using options.
HOA Keypad Display Fault Name
AL02 BAS Interlock Open
Cause Possible Solution
The 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 and
the end switch may not have closed.
HOA Keypad Display Fault Name
AL03
Smoke Purge in Bypass
Note: Also referred to as “Fireman's Override” (Bypass).
Cause Possible Solution
Smoke Purge Bypass input is activated
This is typically an intentional emergency run state. Check the Z2-oo digital input settings to
determine which is set to 25, then check to the physical digital input terminal DI-oo to determine
why it is closed.
HOA Keypad Display Fault Name
AL04
Smoke Purge in Drive
Note: Also referred to as “Fireman's Override” (Drive).
Cause Possible Solution
Smoke Purge Drive input is activated
This is typically an intentional emergency run state. Check the digital input settings (Z2-oo) to
determine which is set to 25. Then check to the physical digital input terminal DI-oo to determine
why it is closed.
HOA Keypad Display Fault Name
AL13 Loss of Load
Cause Possible Solution
The conditions were such that it appears that the
motor has been disconnected from the load.
Replace the belt or coupling between the motor and the load. In the event of a false detection, review
parameters Z1-27 to Z1-32 and set them to more appropriate values.
HOA Keypad Display Fault Name
AL14 Serial Comm Alarm
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.
6.5 Alarm Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 251
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Diagnostics & Troubleshooting