3-52 Troubleshooting
7000-TD002A-EN-P – September 2007
WARNING
MESSAGE
WARNING
CODE
DESCRIPTION RECOMMENDED ACTIONS
T DC Link High 67 Indicates that the Autotune T DCLnk (P218)
measured was greater than 0.100 sec, and
the T DC Link (P115) will have to be tuned
manually.
T DC Link Low 66 Indicates that the Autotune T DCLnk (P218)
measured was less than 0.020 sec, and the
T DC Link (P115) will have to be tuned
manually.
T Rotor Low 72 Indicates that the Autotune T rotor (P222)
measured was less than 0.2 sec, and T
rotor (P132) will have to be tuned manually.
T Rotor High 73 Indicates that the Autotune T rotor (P222)
measured was greater than 5.0 sec, and T
rotor (P132) will have to be tuned manually
– REFER TO THE POWERFLEX 7000
MANUAL (COMMISSIONING chapter)
ON AUTOTUNE PROCEDURES,
RESULTS, AND ACTIONS
Tach Direction 148 The drive has sensed that the 2 channels
(generally A and B) are reversed.
The drive cannot determine the direction of
rotation from the tach feedback. It is likely
that one of the quadrature pulses is not
being sensed. Check all signal connections
on the tachometer feedback board. Replace
the board if necessary.
– Set the parameter Tachometer Select to
‘None’ and verify the parameter
Tachometer Feedback (Line or
Motor)shows the reverse speed
– Reverse the tachometer channels
– See Description as well.
Tach Loss 147 The error between tach feedback and
estimated speed from motor flux is more
than 2Hz (Tach Loss Trip P235). Drive will
continue to run in Sensorless mode. Verify
tach feedback, wiring & +15Vdc supply.
Also ensure the stability of the drive.
– The drive should annunciate the warning
and continue to run on Stator feedback
– Verify that the parameter Tachometer
Feedback (Line or Motor) is/ is not giving
the correct feedback while running
– Investigate the tachometer for damage
– Scope the tachometer pulses on ACB
and verify they are not corrupted by for
example dust in the Optic disc of the tach.
– Verify the wiring from the drive to the
tachometer is per the Electrical Drawing
– Verify the +15VDC supplying the
tachometer is not low/missing
Tach PhaseA Loss 149 The drive has detected a loss of a Phase
from the tachometer. The drive will continue
to run on the tachometer provided pulses
from the other phase are valid.
Tach PhaseB Loss 151 The drive has detected a loss of a Phase
from the tachometer. The drive will continue
to run on the tachometer provided pulses
from the other phase are valid.
– Verify the tachometer, tachometer
wiring, power supply and the board.
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