Lenze SCF frequency inverter - Manual (Page 52)

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Lenze 13466146 EDBSF01 v24 EN
5 Troubleshooting and Diagnostics
The table below lists the fault conditions that will cause the drive to shut down, as well as some
possible causes. Please contact the factory for more information on troubleshooting faults.
FAULT MESSAGES
FAULT DESCRIPTION & POSSIBLE CAUSES
AF High Temperature Fault: Ambient temperature is too high; Cooling fan has failed (if equipped).
CF
Control Fault: A blank EPM, or an EPM with corrupted data has been installed. Perform a factory reset
using Parameter 48 - PROGRAM SELECTION.
cF
Incompatibility Fault: An EPM with an incompatible parameter version has been installed.
Either exchange the EPM, or perform a factory reset (Parameter 48) to change the parameter version
of the EPM to match the parameter version of the drive.
dF
Dynamic Braking Fault: The drive has sensed that the dynamic braking resistors are overheating and
shuts down to protect the resistors.
EF
External Fault: TB-13A and/or TB-13C is set as an External Fault input and TB-13A and/or TB-13C is
open with respect to TB-2. Refer to Parameter 10 or 12.
GF Data Fault: User data and OEM defaults in the EPM are corrupted.
HF
High DC Bus Voltage Fault: Line voltage is too high; Deceleration rate is too fast; Overhauling load.
For fast deceleration or overhauling loads, dynamic braking may be required.
JF Serial Fault: The watchdog timer has timed out, indicating that the serial link has been lost.
LF Low DC Bus Voltage Fault: Line voltage is too low.
OF
Output Transistor Fault: Phase to phase or phase to ground short circuit on the output; Failed output
transistor; Boost settings are too high; Acceleration rate is too fast.
PF
Current Overload Fault: VFD is undersized for the application; Mechanical problem with the driven
equipment.
SF Single-phase Fault: Single-phase input power has been applied to a three-phase drive.
UF
Start Fault: Start command was present when the drive was powered up. Must wait 2 seconds after
power-up to apply Start command if START METHOD is set to NORMAL.
F1 EPM Fault: The EPM is missing or damaged.
F2 - F9, Fo Internal Faults: The control board has sensed a problem - consult factory.
To clear a fault, issue a STOP command, either on the terminal strip, or using the STOP button on the
optional remote keypad. The fault will only clear if the condition that caused the fault has passed.
For example, if the drive trips on a LOW DC BUS VOLTAGE FAULT (LF) due to low input voltage, the
fault cannot be cleared until the input voltage returns to a normal level.
If the drive is programmed to automatically restart after a fault (see Parameter 03), the drive will
attempt to restart three times after a fault (the drive will not restart after CF, cF, GF, F1, F2-F9, or Fo
faults). If all three restart attempts are unsuccessful, the drive will trip into FAULT LOCKOUT (LC),
which requires a manual reset as described above.
NOTE
In the event of a "PF" (MOTOR OVERLOAD) fault there is a 3 minute delay before resetting
is possible. This is a requirement of UL508C. This delay is intended to allow time for the
motor to cool. If power is removed when the drive is in a "PF" state, when the power is
restored the "PF" fault will still be present and the delay will still be active even it power
was removed for longer than 3 minutes.