When there is a critical condition detected in your Control Techniques UNIDRIVE, the drive will continue to operate, but the lower display’s status indication will be replaced by an alarm indication. When an HF trip takes place, the Drive Healthy relay will open and serial communications will not function. It is important to give attention to alarm indications, because if an issue is not corrected, the drive could trip.
Refer to the guide below to help identify what kind of error your UNIDRIVE may be experiencing. A comparison chart with status indications is also provided to help identify what happens at each stage of operation.
|Alarm Code||Alarm Description|
|AIR||Control PCB ambient temperature near maximum limit|
|The ambient temperature around the control PCB has reached 90 degrees Celsius (194 degrees Fahrenheit). If the temperature continues to rise, the drive will trip OA.|
|br.rS||Braking resistor is overloaded|
|The braking resistor [l x t] accumulator in the drive has reached 75% of the value at which the drive will be tripped.|
|Hot||Heatsink temperature near maximum limit|
|The heatsink in the drive has reached 90 degree Celsius (194 degree Fahrenheit). If the temperature continues to rise, the drive will trip Oh2.|
|OVLd||Motor is overloaded|
|The motor [l x t] accumulator in the drive has reached 75% of the value at which the drive will be tripped.|
Status Indications of the Drive
These indications are seen in the lower display when the drive is in normal operation.
|LOWER DISPLAY||DESCRIPTION||STAGE OF DRIVE OUTPUT|
|Act||Regeneration Mode is active||ENABLED|
|Regen drive enabled and synchronized to the supply|
|ACUU||AC Supply Loss||ENABLED|
|Drive has detected that the AC supply has been lost and is decelerating the motor to maintain the DC bus voltage.|
|dc||DC has been applied to the motor||ENABLED|
|Drive is applying DC injection braking|
|Drive is decelerating the motor|
|Drive has been inhibited and cannot be run. Could be because the Drive Enable signal is not applied to terminal 30 or Pr 6.15 is set to 0.|
|Drive is positioning the motor shaft|
|Drive is ready to be run|
|Drive is running|
|OL> Drive is searching for the motor frequency when synchronizing to a spinning motor.
Regen> Drive is enabled and synchronizing to the line.
|StoP||Stop or holding zero speed||ENABLED|
|Drive is holding the motor at zero speed.
Regen> Drive is enabled but the AC voltage is too low or DC Bus voltage is still rising or falling.
|Drive has tripped and no longer controlling the motor. Trip code appears on upper display.|