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Electronic error codes - HTC 950 RX
The HTC 950 RX™ is fitted with an advanced frequency converter. The converter can provide
an error code for certain errors that assists when fault tracing. Always state the error code if
possible when contacting support. For resetting see page 37.
Error code Cause Action
OCF OCF = Rapidly rising current
Due to a high short-term load that is
2.5 times greater than nominal current
for a specific period. The error may
arise if you drive into something or if a
grinding disk or something in the grind-
er locks. Could also occur if a short
circuit on the motor side occurs.
Check mechanical inertia, spin the
grinding disks. Do the disks spin slug-
gishly? Reset the converter. Remove
the contact to the motor and start the
converter to see if the error remains.
Also see the point below. If the error
remains the converter will need service.
OHF OHF = Rapidly rising current
A lower level of the same error given
above. This error may arise where
there is a heavy load. The error arises
at 2 times the nominal current for a
specific period. Frequently appears fol-
lowing high power consumption for an
extended period. The error could also
arise in hot conditions. (+ 50 degrees)
Since the error is related to the above
mentioned problem, the actions named
there should be checked first. If the
surface being processed is very tough,
this may cause this problem. If the error
is related to temperature, the grinder
must be allowed to cool down before
starting again. Another measure could
be to reduce speed to about half as the
grinder will then use less power.
InF / EEF InF / EEF = Internal fault
fault in the inverter
Contact service.
SCF SCF = Short circuit on motor side
Due to a short circuit either in the mo-
tor or in the motor cable. May also be
an earth fault.
Check the cabling and test the insula-
tion in the motor if necessary. Test by
loosening the motor cable and starting
the frequency converter to see if the
error code arises. If it does, the error is
in the frequency converter. If not, the
cable or the motor is probably defec-
tive.
tnF tnF = Autotuning fault
May arise if the motor has replaced a
defective motor. The motor is outside
the norms for what a converter can
handle. Could also arise if the motor is
defective.
Check the motor. Replace the motor
with an original motor.
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