Yaskawa AC Drive Z1000 - Manual (Page 213)

Output current fluctuation due to input phase loss Check the power supply for phase loss.
HOA Keypad Display Fault Name
oL2
Drive 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 through C1-04).
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 Replace the drive with a larger model.
Overload occurred when operating at low speeds
• Reduce the load when operating at low speeds.
• Replace the drive with a model that is one frame size larger.
• 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 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 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 Fault Name
oL7
High Slip Braking oL
The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
Cause Possible Solution
Excessive load inertia
Reduce deceleration times in parameters C1-02 and C1-04 for applications that do not use High Slip
Braking.
Motor is driven by the load
Something on the load side is restricting
deceleration
The overload time during High Slip Braking is too
short
• Increase parameter n3-04 (High-slip Braking Overload Time).
• Install a thermal relay and increase the setting of n3-04 to maximum value.
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).
• Drive software versions PRG: 1014 and later detect an oPr fault when the HOA keypad is removed
from the drive while the sequence timer is active, even when oPr error detection is disabled (o2-06
= 0).
Cause Possible Solution
External operator is not properly connected to the
drive
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Reconnect the operator and reapply
drive input power.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710616 45E YASKAWA AC Drive – Z1000 User Manual 213
5
Troubleshooting