WARNING 87, Auto DC-Braking
Cause
Occurs in IT mains when the drive coasts, and the DC voltage is higher than 830 V for 400 V units and 425 V for 200 V units. The motor
consumes energy on the DC link. This function can be enabled/disabled in P 2.3.13 Auto DC Braking.
WARNING/FAULT 95, Lost Load Detected
Cause
Torque is below the torque level set for no load, indicating a lost load detection. P 5.2.9 Lost Load Function is set for alarm.
Troubleshooting
l Troubleshoot the system.
l Reset the drive after the fault is cleared.
FAULT 99, Locked Rotor
Cause
The rotor is blocked. It is only enabled for PM motor control.
Troubleshooting
l Check if the motor shaft is locked.
l Check if the start current triggers the current limit set in P 2.1.5 Output Current Limit %.
l Check if it increases the value in P 4.6.15 Sync. Locked Rotor Detection Time [s].
FAULT 126, Motor Rotating
Cause
During AMA start-up, the motor is rotating. It is only valid for PM motor.
Troubleshooting
l Check if the motor is rotating before starting the AMA.
WARNING 127, Back EMF Too High
Cause
This warning applies to PM motors only. When the back EMF exceeds 90% x U
invmax
(overvoltage threshold) and does not drop to normal
level within 5 s, this warning is reported. The warning remains until the back EMF returns to a normal level.
274 | Danfoss A/S © 2024.03 AB413939445838en-000301 / 130R1254
Application Guide | iC2-Micro Frequency Converters
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