HTC 420 VS, User Manual

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Electronic Error Codes HTC 420 VS
28 3.0
7. Electronic Error Codes
7.1. General
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.