Lenze 9212, Operating Instructions Manual, Page: 78 / 86

74
Service
1. Monitoring messages
The servo drives of the 9200 series have numerous monitoring
functions, to protect against non-permissible operating conditions.
When such a protective function is activated, it either causes a
corresponding message on the controller display and pulse inhibit
(IMP) or, in addition (TRIP) setting. The type of fault is immediately
displayed. After having removed the fault, the pulse inhibit is
released automatically. Faults, however, causing a TRIP setting
must be reset und C067 by pressing SH+PRG or by a high signal
on input X5, terminal 27, TRIP reset.
1.1. Monitoring without activating pulse inhibit
•
Following error
The increments of the master frequency set value (Dig.Set) are
interpreted as angle increments (condition: V
pw
>0). If the drive
cannot follow the set increments the message "Following error"
will be displayed as soon as a following error exceeds 3188
increments (2048 increments
∉
360° at the motor shaft). The
error message disappears when the motor reaches the set
angle. A following error >3188 increments cannot be corrected.
1.2. Monitoring with activating pulse inhibit
•
LU Undervoltage
The mains voltage of the supply module is monitored by
measuring the DC bus voltage. If the DC bus voltage decreases
below 330V ± 4%, the servo controllers cannot continue to
operate. The axis modules are inhibited via the State Bus. If the
mains voltage increases above 430V ± 3% again, the axis
modules are released again.
1.3. Monitoring with TRIP setting
•
OC1 Short circuit
OC1 is displayed if the current controller of the axis modules is
not able to limit the output current of the controller to the peak
current. Check if there is a short circuit in the motor or the motor
supply cable.
•
OC2 Earth fault
An earth fault current is detected if the total of the phase output
current is not 0. Check if there is an earth fault in the motor or
the motor supply cable.
Caution:
Before switching on the mains again, it must be ensured that the
earth fault has been removed. The inverter free wheeling diodes
may be destroyed by earth faults.