YASKAWA iQpump1000 - Page 281

HOA Keypad Display Minor Fault Name
Parameters related to Speed Search are set
incorrectly
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search (b3-03) and the Speed Search deceleration time (b3-02).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Output current fluctuation due to input
phase loss
Check the power supply for phase loss.
HOA Keypad Display Minor Fault Name
oL3
Overtorque Detection 1
The current has exceeded the 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 L6-02 and L6-03 settings.
Fault on the machine side (e.g., machine is
locked up)
Check the status of the load. Remove the cause of the fault.
HOA Keypad Display Minor Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable
time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-05 and L6-06.
HOA Keypad Display Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
• For 200 V class drives: approximately 410 V
• For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400)
• For 600 V class drives: approximately 1040 V
Cause Possible Solutions
Surge voltage present in the drive input
power.
• Install a DC link choke or an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the same
drive input power system.
The motor is short-circuited.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
Ground current has overcharged the main
circuit capacitors via the drive input power.
Noise interference causes the drive to
operate incorrectly.
• Review possible solutions for handling noise interference.
• Review section on handling noise interference and check control circuit lines, main circuit lines and ground
wiring.
• If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.
Set number of fault restarts (L5-01) to a value other than 0.
HOA Keypad Display Minor Fault Name
PoC Pump Over Cycle
Cause Possible Solution
The pump has exceeded the number of
cycles set in P2-10 in the time set in P2-11
and P2-12 is set to 1 (alarm).
• Set the Pump Over Cycle alarm characteristics in P2-10 and P2-11.
• Drive response to this condition is controlled by P2-12, Over Cycling Mode.
HOA Keypad Display Minor Fault Name
R-DNE-So
Remote Drive Disable
Cause Possible Solution
Terminal So (H1-0o = 95) has been
closed for the time set in P4-26, Remote
Drive Disable On-Delay, when P4-25,
Remote Drive Disable Selection, was set to
0 (N.O.).
Remove conditions causing the terminal to close.
5.3 Alarm Detection
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
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Troubleshooting