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HTC 420 VS

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

All the error codes that may occur in the frequency converter in the

control cabinet are listed below.

Table 7-1:Electronic error codes

Error code

Cause

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.

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).

InF / EEF

InF / EEF = Internal fault

Fault in the frequency converter.

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.

2.0

Electronic error codes

Action

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.