Electronic error codes HTC 950 RX
38 1.0
7 Electronic error codes
7.1 General Information
A common fault on grinders is that the motor is overloaded. There are three levels of
overloading.
OCF = Rapidly rising current
OHF = Rapidly rising current
OLF = Overload motor
In the event of an error, the error code is shown in the display. The most common error
codes that may occur on the frequency converter, in the control cabinet, are listed below.
In the event of other errors, contact the HTC Service Centre.
7.2 Schneider Electric ATV31
Error
code
Cause Action
OCF OCF = Rapidly rising current
Due to a high short-term load that is 2.5
times the nominal current over a certain
period. This usually occurs if you run
into something or if either the grinding
discs or something else inside the
machine locks up. May also occur if the
motor short circuits.
Check mechanical inertia, spin the grinding discs.
Reset the converter if the machine is sluggish.
Remove the plug for the motor and start the
converter to see if the fault remains. See also the
point below. Contact HTC Service Centre if the fault
remains.
OHF OHF = Rapidly rising current
A less severe version of the same fault
above. Due to a high short-term load that
is 2 times the nominal current over a
certain period. Usually occurs as a result
of high power consumption over a
prolonged period. May also occur at high
temperatures (+ 50° C).
As the fault is related to the above fault, the action
indicated there should be carried out. If the surface
being worked on is very tough, this may cause this
fault. If the fault is temperature-related, the machine
must be left to cool down before it can be started
again. Another solution is to reduce the speed of the
grinding discs to half speed, as the machine will then
use less power.
InF /
EEF
InF / EEF = Internal fault
Fault in the frequency converter.
Contact HTC Service Centre.
SCF SCF = Short circuit in the motor
Due to a short circuit in the motor or the
motor cable. May also be due to an earth
fault.
Check the wiring and, if necessary, the motor
isolation. Test by loosening the motor cable and
starting the frequency converter to see if the error
code appears. If this occurs, the fault is in the
frequency converter, otherwise the cable or motor is
broken.
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