Lenze 931W - Manual (Page 26)

Software implementation and parameter setting
Status menu
Fault messages
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26 HB 13.0001-EN 3.0
5.2.2 Fault messages
The menu item called ”Fault” in the ”Status” menu contains different fault messages,
which in the following are explained in detail. If a fault occurs, the drive is automatically
switched off, whereby the control electronics are further on supplied with voltage, i.e. only
the output stage is disconnected.
ƒ DC-bus voltage underrun
The DC-bus voltage that is responsible for supplying the power section has underrun the
permissible limit value, so that the motor is not able to operate correctly anymore. The
limit values are listed in the table: ( 23)
ƒ Brake voltage beyond the tolerance range
The voltage for the brake is beyond the set range that can be adjusted under the ”Service”
tab (delivery condition 20…28 V).
ƒ Motor temperature exceeded
In spite of the derating, i. e. linear deceleration of the motor power, the motor temperature
has exceeded the critical value of 140°C.
ƒ Electronics temperature exceeded
This fault message means that the temperature of the motor electronics has exceeded the
maximum value of 78°C.
ƒ DC-bus voltage exceeded
The DC-bus voltage has exceeded the critical value of the respective voltage variant
( 23). A frequent cause for this is a deceleration process with a brake ramp that is too
steep, so that the power recovery of the inverter results in an increase of the DC-bus
voltage, which - in case of a power recovery that is too high - cannot be kept below the
permissible limit values by the internal brake resistor (230 V AC device) or by the DC-supply
device (24 V DC, 42 V DC, 320 V DC devices).
ƒ Quick stop:
Due to an external event, a quick stop has been actuated. This is effected via the digital
input of the inverter or via the ”Quick stop” operator panel. If a quick stop is carried out, the
motor decelerates to 0 rpm at the maximum braking torque.
ƒ Drive not referenced:
In this case, a fault has occurred during the reference run, or the reference run has not been
carried out. Here in particular the parameter setting of the ”Reference” menu is to be
examined. Often, however, other fault messages also indicate the cause of fault, e. g. by
”Drive blocks”.
ƒ Motor exceeded:
This fault indicates that due to an overcurrent the output stage of the motor has been
switched off. This can be caused by a short circuit or an overcurrent by disadvantageously
set controller parameters.