Commander SE User Guide
Issue Number 5
57
8
Diagnostics and Protective Features
Do not attempt to carry out internal repairs. Return a faulty Drive to the
supplier for repair.
The following protective features are incorporated within the Commander SE Drive.
They are placed in order of Trip number which is the figure that is read back through
the serial comms.
8.1
Trip codes
When a trip condition occurs, the left hand display will show the legend
whilst the
right hand display flashes one of the trip codes given in Table 8.1.
Table 8.1 Trip Codes
WARNING
tr
Trip Code
Trip
Number
Condition
Possible Cause
UU
1
DC link under voltage
Low AC supply voltage
Low DC link voltage when supplied by external
DC power supply
OU
2
DC link over voltage
Excessive inertia in the machine during
deceleration
Deceleration rate set too fast for inertia of
machine
OI.AC**
3
AC instantaneous over current trip
Insufficient ramp times
Phase to phase or phase to earth short-circuit at
the Drive output
Drive requires autotuning to motor (see
parameter 38)
OI.br**
4
Overcurrent on braking IGBT
Excessive current in braking resistor
Braking resistor value too small
(Does not apply to Size 1 units)
Et
6
External trip
External trip terminal opened (when
programmed)
O.SP
7
Over speed
Excessive motor speed (typically caused by the
mechanical load driving the motor)
tunE
18
Auto-tune failure
Motor loaded or no motor connected
It.br
19
Ixt on braking resistor
Excessive braking resistor energy
(Does not apply to Size 1 units)
It.AC
20
Motor overload on current x time
Too much mechanical load
Oht1
21
Overheat
Overheat thermal model
Oht2†
22
Overheat (heatsink thermistor)
Temperature exceeds 95°C (203°F)
th
24
Over temperature (Motor thermistor)
Excessive motor temperature
O.Ld1*
26
+24V or digital output overload
Excessive load or short circuit on +24V output
cL
28
Current loop loss on terminal 5
Input current less than 3mA when 4-20 or 20-4
modes used
SCL
30
User serial communications
watchdog failure
Failure of serial communications between Drive
and master
EEF
31
Failure of internal EEPROM
Possible loss of parameter values
Corruption due to severe electrical noise
Set default parameters (see parameter 29)
