YASKAWA iQpump1000 User Manual page 266

5.2 Fault Detection
HOA Keypad Display
The braking operation duty cycle is too
high
The proper braking resistor has not been
installed
Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more
frequently than its rating permits will trip the alarm even when the braking resistor surface is not very hot.
HOA Keypad Display
rr
Cause
The braking transistor is damaged
The control circuit is damaged
HOA Keypad Display
SC
Cause
IGBT fault
IGBT short circuit detection circuit fault
The drive is damaged
HOA Keypad Display
SEr
Cause
Parameters related to Speed Search are set
to the wrong values
The motor is coasting in the opposite
direction of the Run command
HOA Keypad Display
SPL
Suction Pressure Loss
Cause
An analog input programmed for setting 23
"WaterLvl/Suction" has dropped below 3
mA or risen above 21 mA for longer than 1
second.
HOA Keypad Display
TdE
Cause
An error has occurred in the Real-Clock
Time function of the HOA keypad.
HOA Keypad Display
THo
<1>
Cause
266
Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors
(L8-01 = 1) allows a braking duty cycle of maximum 3%.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Dynamic Braking Transistor
The built-in dynamic braking transistor failed.
• Cycle power to the drive and check for reoccurrence of the fault.
• Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or a Yaskawa representative.
IGBT Short Circuit or Ground 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.
• 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.
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
• 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.
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Suction Pressure Loss
Wire-break detection for suction pressure.
Repair pressure sensor or wiring.
Time Data Error
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your nearest
sales representative.
Thermistor Disconnect
The thermistor that detects motor temperature has become disconnected.
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YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual