9. Diagnostics and Fault Clearance
• DOK-CONTRL-DDC+MDD+DLC-ANW1-EN-E1,44 • 01.97
95
51
Motor overtemperature warning (flashing)
The motor has reached maximum permissible temperature. The drive can
still maintain the command value for another 30 seconds. This means that it
is possible to bring the axis via the DLC to a standstill appropriate to the pro-
cedure being performed. In other words, finishing can be completed, rem-
oval out of the area of possible collision and so on.
The drive is brought to a standstill as per the error reaction set after 30
seconds.
Remedy
The motor was overlaoded. The effective torque required by the motor
exceeded the permissible continuous standstill torque for too long a period.
52
Bleeder overtemperature warning (flashing)
The bleeder prewarn contact (BVW) opens and can be evaluated. The conti-
nous regenerative power is then greater than 75% of the continuous bleeder
output. If the bleeder load continues to climb, there will a shutdown and error
20 will be generated.
60
Overcurrent: short in the power stage (bridge fuse)
The current in the power transistor bridge has exceeded twice the value of
the peak current of the machine. The drive was immediately switched torque
free as a result.
Remedy
1. Short circuit in motor cable.
2. Power section of the drive controller defective.
3. Short circuit in motor.
61
Short to ground (earth connection)
The sum of the phase currents is monitored. During normal operation, the
sum = 0. The earth connection fuse will react when the sum of the currents
rises above 0.5 x I
N
Remedy
1. Motor cable defective.
2. Short to ground in motor.
67
Erroneous internal hardware synchronization
The pulse width modulator of the drive controller is synchronized by a phase
control loop. The synchronization is monitored and the above error message
signalled when a fault is detected.
Remedy
1. Check motor layout. In those plants that have been in operation for an
extended period it is advisable to check drive conditions in terms of dirt
contamination, moving masses and so on.
2. Check the lead to the motor temperature monitor for earth shorts or
short circuits.
1. Check motor cable and motor for short circuit. Replace with short circuit.
2. Replace drive controller.
1. Check motor cable and motor for short to ground and replace, if neces-
sary.
1. Replace drive controller and send it for a check.