Yaskawa AC Drive Z1000 - Manual (Page 220)

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.
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 = 20 to 2F).
• Reconnect the signal line.
Multi-function contact inputs are set incorrectly
• Check if the unused terminals have been set for H1-oo = 20 to 2F (External Fault).
• Change the terminal settings.
HOA Keypad Display Minor Fault Name
FbH
Excessive PI Feedback
The PI 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.
PI 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.
HOA Keypad Display Minor Fault Name
FbL
PI Feedback Loss
The PI feedback input is lower than the level set to b5-13 for longer than the time set to b5-14, and
b5-12 is set to 1 or 4.
Cause Possible Solutions
Parameter settings for b5-13 and b5-14 are
incorrect
Check parameters b5-13 and b5-14.
PI 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.
HOA Keypad Display Minor Fault Name
HCA
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Cause Possible Solutions
Load is too heavy Reduce the load for applications with repetitive operations (i.e., stops and starts), or replace the drive.
5.5 Alarm Detection
220 YASKAWA ELECTRIC TOEP C710616 45E YASKAWA AC Drive – Z1000 User Manual