Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 254)

HOA Keypad Display Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
Cause Possible Solutions
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
HOA Keypad Display Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause Possible Solutions
An external fault was received from the PLC with
F6-03 set to 3, which allows the drive to continue
running after an external fault occurs
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
There is a problem with the PLC program Check the PLC program and correct problems.
HOA Keypad Display Minor Fault Name
EF1
External Fault (Input Terminal S1)
External fault at multi-function input terminal S1.
EF2
External fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External fault (input terminal S3)
External fault at multi-function input terminal S3.
EF4
External fault (input terminal S4)
External fault at multi-function input terminal S4.
EF5
External fault (input terminal S5)
External fault at multi-function input terminal S5.
EF6
External fault (input terminal S6)
External fault at multi-function input terminal S6.
EF7
External fault (input terminal S7)
External fault at multi-function input terminal S7.
EF8
External fault (input terminal S8)
External fault at multi-function input terminal S8.
Cause Possible Solutions
An external device has tripped an alarm function Remove the cause of the external fault and reset the multi-function input value.
Wiring is incorrect
• Ensure the signal lines have been connected properly to the terminals assigned for external fault
detection (H1-oo = 24).
• Reconnect the signal line.
Multi-function contact inputs are set incorrectly
• Check if the unused terminals have been set for H1-oo = 24 (External Fault).
• Change the terminal settings.
HOA Keypad Display Minor Fault Name
FbH
Excessive PID Feedback
The PID feedback input is higher than the level set to b5-36 for longer than the time set to b5-37, and
b5-12 is set to 1 or 4.
Cause Possible Solutions
Parameter settings for b5-36 and b5-37 are
incorrect
Check parameters b5-36 and b5-37.
PID feedback wiring is faulty Correct the wiring.
Feedback sensor has malfunctioned Check the sensor and replace it if damaged.
Feedback input circuit is damaged
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
6.5 Alarm Detection
254 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual