Yaskawa Z1000 AC Drive HVAC - Manual (Page 213)

Digital Operator 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- = 2C to 2F).
• Reconnect the signal line.
Multi-function contact inputs are set
incorrectly.
• Check if the unused terminals have been set for H1- = 2C to 2F (External Fault).
• Change the terminal settings.
Digital Operator Display Minor Fault Name
EoF EoF Emergency Override Forward Run
Cause Possible Solution
The multi-function digital input for
EmergOverrideFWD (H1- = AF) has
been closed.
Open H1- = AF if the emergency condition is no longer present
Digital Operator Display Minor Fault Name
Eor Eor Emergency Override Reverse Run
Cause Possible Solution
The multi-function digital input for
EmergOverrideREV (H1- = B0) has
been closed.
Open H1- = B0 if the emergency condition is no longer present
Digital Operator 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.
Digital Operator Display Minor Fault Name
FbL
PID Feedback Loss
The PID feedback input is lower than the level set to b5-13 for longer than the time set to b5-14.
Cause Possible Solutions
Parameter settings for b5-13 and b5-14 are
incorrect.
Check parameters b5-13 and b5-14.
5.5 Alarm Detection
YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual 213
5
Troubleshooting