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HTC 420 VS

Error code

Cause

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.

tnF

tnF = Autotuning fault

May arise if the motor has been

replaced by the wrong motor, which

is outside the norm values for the

converter. May also arise if the

motor is broken.

OLF

OLF = Overload motor

Occurs when the motor is

overloaded for a prolonged period.

The motor protection in the

converter trips in order to protect

the motor.

OSF

OSF = Over-voltage

Mains voltage too high or

disturbance in the mains supply.

May occur if large motors/machines

are switched on or off in the

vicinity. May be due to non-CE

marked equipment.

USF

USF = Under-voltage

Voltage too low due to large number

of consumers using the network.

Temporary drop in voltage. Long

and/or weak cables may also cause

this fault.

ObF

ObF = Operating load when stopped

Arises if the grinding discs are

running when the machine is to be

switched off.

3.0

Electronic Error Codes

Action

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.

Check the motor. Replace the motor

with an original motor.

Switch off the machine. The motor

protection must cool.

Wait 8 minutes before the machine

is restarted.

Measure the supply voltage. Change

the socket. The max. permitted

supply voltage is 240V + 10%.

Replace the socket or remove some

of the consumers from the network

(welding, etc. causes such faults).

Check the power supply to the

machine, i.e. the fuses and cable. If

the machine still does not function

after the power supply has been

checked, the fault may be due to a

fault on the contactor in the machine

or in the control panel. In this case,

contact HTC Service Centre.