Trips and Fault Finding
6511
Keypad
Display
6901
Keypad
Display
Description
Possible Reason for Trip
ATN5
NEGATIVE SLIP F
♦
Autotune has calculated a negative slip frequency,
which is not valid. Nameplate rpm may have been set
to a value higher than the base speed of the motor.
Check nameplate rpm, base frequency, and pole pairs
are correct.
ATN6
TR TOO LARGE
♦
The calculated value of rotor time constant is too
large. Check the value of nameplate rpm.
ATN7
TR TOO SMALL
♦
The calculated value of rotor time constant is too
small. Check the value of nameplate rpm.
ATN8
MAX RPM DATA ERR
♦
This error is reported when the MAX SPEED RPM is
set to a value outside the range for which Autotune
has gathered data. Autotune gathers data on the motor
characteristics up to 30% beyond “max speed rpm”. If
MAX SPEED RPM is later increased beyond this
range, the drive had no data for this new operating
area, and so will report an error. To run the motor
beyond this point it is necessary to re-autotune with
MAX SPEED RPM set to a higher value.
STAC STACK
TRIP
♦
The drive was unable to distinguish between an
overcurrent/desat or overvoltage trip
1
2
3
4
5
6
7
8
9
10
11
A
B
C
D
E
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Page
10-11