10/05 AWB8230-1541GB
Monitoring functions
119
Fault messages
Frequency inverter DF51 features several built-in monitoring
functions. To protect against damage, the inverter is automatically
inhibited when a fault signal is detected. The connected motor
then coasts to a halt and the fault signal is indicated by the red
ALARM LED. The display shows an error code (E…). The DF51
remains inhibited until the fault message is acknowledged. To
acknowledge the fault signal:
• Press the STOP key,
• activate the digital input configured as RST,
• switch off the power supply.
Display Cause Description
E 01
Inverter overcurrent in static
operation
In the following cases, the output current is too high:
• The frequency inverter’s output is short-circuited
• The motor is blocked
• An excessive load is suddenly applied to the output.
E02
Inverter overcurrent during
deceleration
E03
Inverter overcurrent during
acceleration
E04
Inverter overcurrent at standstill
E05
Overload The internal electronic motor protection has switched off the output voltage because of
an overload.
E07
Overvoltage Overvoltage in regenerative mode.
E08
EEPROM fault The program memory is not operating reliably due to radio frequency interference, a
control voltage short-circuit (P24–L) or excessive temperature.
If the supply voltage is switched off while the RST input is active, an EEPROM fault may
occur when the supply voltage is switched on again.
E09
Undervoltage Insufficient DC voltage (error-free electronics function not possible; potential problems
such as overheating of motor and insufficient torque).
E11
Processor malfunction Processor is not working correctly, for example because of RFI or excessive temperature.
E12
External fault message An external fault signal is applied to a digital input configured as EXT input.
E13
Restart inhibit activated The mains voltage was switched on or an intermittent interruption in the supply voltage
has occurred while unattended start protection (input USP) was active.
E14
Ground fault Earth faults between the U, V or W terminals and earth are being reliably detected. A
protective circuit prevents destruction of the frequency inverter at startup, but does not
protect the operating personnel.
E15
Mains overvoltage The mains voltage exceeds the permissible value. Shutdown about 100 s after activation
of power supply.
E21
Overtemperature The built-in temperature sensor in the power section is measuring an operating
temperature above the permissible limit value.
E 22 Processor malfunction Processor is not working correctly, for example because of RFI or excessive temperature.
E 30 Gate array fault Internal communication error between CPU and the logical vector groups (gate array).
The IGBT power module is switched off immediately.
E35
Thermistor fault signal The resistance of the externally fitted PTC thermistor connected to the PTC input (digital
input configured as PTC input) is too high.
E60 Communication fault Communication with the frequency inverter timed out a PNU C076 and C077.
Undervoltage (intermittent display) The undervoltage signal appears briefly if the supply voltage (mains voltage or internal
DC link voltage) is too low. The output to the motor (U, V, W) is switched off immediately.
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