Yaskawa iQpump Micro - Manual (Page 177)

Digital Operator Display Fault Name
rr
Dynamic Braking Transistor
The built-in dynamic braking transistor failed.
Cause Possible Solution
The braking transistor is damaged • Cycle power to the drive and check for reoccurrence of the fault.
• Replace the drive.
The control circuit is damaged
Digital Operator Display Fault Name
SC IGBT Short Circuit or Ground Fault
Cause Possible Solution
IGBT fault • Check motor wiring.
• Turn off the power supply, then turn it on. If the problem continues, contact your Yaskawa representative
or the nearest Yaskawa sales office.
IGBT short circuit detection circuit fault
The drive is damaged
• Check the drive output side short circuit for a broken output transistor
B1 and U/T1, V/T2, W/T3
– and U/T1, V/T2, W/T3
• Contact your Yaskawa representative or nearest Yaskawa sales office.
Digital Operator Display Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
Cause Possible Solution
Parameters related to Speed Search are set
to the wrong values
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
The motor is coasting in the opposite
direction of the Run command
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Digital Operator Display Fault Name
TIE Time Interval Error
Cause Possible Solution
An error has occurred in the Real-Clock
Time function of the HOA keypad.
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your nearest
sales representative.
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable
time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side Check the load for any problems.
Digital Operator Display Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable
time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for
the load
Check L6-05 and L6-06 settings
There is a fault on the machine side Check the load for any problems.
Digital Operator Display Fault Name
UL6
Underload Det 6
Motor Underload
The load has fallen below the underload curve defined in L6-14.
Cause Possible Solution
5.2 Fault Detection
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual 177
5
Troubleshooting