Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 247)

HOA Keypad Display Fault Name
Parameters related to Speed Search are set
incorrectly
• Check values set to Speed Search related parameters.
• Reduce the Speed Search Operation Current Level 1 (Current Detection Type 2) (b3-31).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Output current fluctuation due to power supply
loss
Check the power supply for phase loss.
HOA Keypad Display Fault Name
oL2
Overload
The thermal sensor of the drive triggered overload protection.
Cause Possible Solution
Load is too heavy Reduce the load.
Acceleration or deceleration time is too short Increase the settings for the acceleration and deceleration times (C1-01 and C1-02).
The output voltage is too high
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not lower E1-08 and E1-10 excessively. This reduces load tolerance at low speeds.
Drive capacity is too small Use a larger drive.
Overload occurred when operating at low speeds
• Reduce the load when operating at low speeds.
• Use a larger drive.
• Lower the carrier frequency (C6-02).
Excessive torque compensation Reduce the torque compensation gain in parameter C4-01 until there is no speed loss but less current.
Parameters related to Speed Search are set
incorrectly
• Check the settings for all Speed Search related parameters.
• Adjust the current used during the Speed Search deceleration time (b3-03).
• 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 Fault Name
oL3
Overtorque Detection 1
The current has exceeded the value set for Torque Detection Level 1 (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 Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Torque Detection Level 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 Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solution
Overtorque triggered mechanical weakening
detection level set to L6-08
Identify the cause of mechanical weakening.
HOA Keypad Display Fault Name
oPr
HOA Keypad Connection Fault
The HOA keypad has been disconnected from the drive.
An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the keypad is disconnected (o2-06 = 1).
• The Run command is assigned to the keypad (b1-02 = 0 and OFF mode has been selected).
Cause Possible Solution
6.4 Fault Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 247
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Diagnostics & Troubleshooting