50 Unidrive M300/HS30 Quick Start Guide
Issue Number: 6
dESt
Two or more parameters are
writing to the same destination
parameter
The dESt trip indicates that destination output parameters of two
or more logic functions (Menus 7 and 8) within the drive are
writing to the same parameter.
dr.CF Drive configuration Contact the supplier of the drive.
EEF
Default parameters have been
loaded
The EEF trip indicates that default parameters have been
loaded. The exact cause/reason of the trip can be identified from
the sub-trip number (see Drive User Guide).
Et An External trip is initiated
The cause of the trip can be identified from the sub trip number
displayed after the trip string.
Refer to Drive User Guide.
FAN.F Fan fail Indicates the fan or fan circuitry has failed
Fi.Ch File changed A file has been changed, power cycle to clear the trip
FI.In Firmware Incompatibility The user firmware is incompatible with the power firmware.
HFxx trip Hardware faults Internal drive hardware fault (see Drive User Guide).
It.Ac
Output current overload timed out
(I
2
t)
The It.Ac trip indicates a motor thermal overload based on the
output current and motor thermal time constant. The drive will
trip on It.Ac when the accumulator gets to 100 %.
This can occur when:
• There is excessive mechanical load
• Ensure the load is not jammed / sticking
• Check the load on the motor has not changed
• Ensure the motor rated current is not zero
It.br
Braking resistor overload timed out
(I
2
t)
Braking resistor overload has timed out. This can be caused by
excessive braking resistor energy.
no.PS No power board No communication between the power and control boards.
O.Ld1 Digital output overload
The total current drawn from 24 V user supply or from the digital
output has exceeded the limit.
O.SPd
Motor frequency has exceeded the
over frequency threshold
Excessive motor speed (typically caused by mechanical load
driving the motor).
Oh.br Braking IGBT over-temperature Braking IGBT over-temperature. Detected by thermal model
Oh.dc DC bus over temperature
DC bus component over temperature based on a software
thermal model.
Oht.C Control stage over-temperature Control stage over-temperature detected.
Oht.I
Inverter over temperature based
on thermal model
IGBT junction over-temperature has been detected based on a
software thermal model.
Oht.P Power stage over temperature
This trip indicates that a power stage over-temperature has
been detected.
Oht.r Rectifier over temperature
The Oht.r trip indicates that a rectifier over-temperature has
been detected.
OI.A1 Analog input 1 over-current Current input on analog input 1 exceeds 24 mA.
OI.AC
Instantaneous output over current
detected
The instantaneous drive output current has exceeded.The set
limit.
Possible solutions:
• Increase acceleration/deceleration rate
• If seen during autotune reduce the voltage boost
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation
tester
• Is the motor cable length within limits for the frame size
• Reduce the values in the current loop gain parameters
Trip
code
Condition Description
Sub-trip Reason
1 External Trip = 1
Unidrive M300 Quick Start Guide English Iss6.book Page 50 Tuesday, September 22, 2015 3:21 PM
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