Parker AC890 Product Manual page 216

6511 6901
Keypad Keypad
Display Display
ATN5 NEGATIVE SLIP F
ATN6 TR TOO LARGE
ATN7 TR TOO SMALL
ATN8 MAX RPM DATA ERR
STAC STACK TRIP
890SD Standalone Drive - Frames G, H & J
Description
 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.
 The calculated value of rotor time constant is too
large. Check the value of nameplate rpm.
 The calculated value of rotor time constant is too
small. Check the value of nameplate rpm.
 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.
 The drive was unable to distinguish between an
overcurrent/desat or overvoltage trip
Trips and Fault Finding
Possible Reason for Trip
9-11
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