Monitoring Functions; Brief Description; Monitoring The Final Output Stage - Festo SEC-AC-305 Fitting And Installation Instructions

1. Summary of components
1.9

Monitoring functions

1.9.1 Brief description

Error memor

1.9.2 Monitoring the final output stage

1−14
The SEC−AC possesses an extensive arrangement of sensors
which monitor the faultless functioning of the controller unit,
the final output stage, the motor and the communication with
the peripherals.
Any faults which occur are saved in the internal error memory.
Most errors cause the controller unit to switch off the regula
tor and the final output stage. The regulator cannot be swit
ched on again until the fault has been rectified and the error
memory has been deleted by quitting (switch off the voltage
or actuate the reset button above the figure display).
The final output stage is monitored by extensive protective
functions.
Overcurrent and short−circuit monitoring:
This reponds as soon as the current in the intermediate
circuit exceeds twice the maximum current of the regula
tor. Short circuits between two motor phases are recogni
zed as well as short circuits at the motor output terminals
in respect of the positive and negative reference potential
of the intermediate circuit and in respect of protective
earth. When the error monitoring recognizes an overcur
rent, the final output stage is switched off immediately, so
that resistance to short circuits is guaranteed.
Overvoltage monitoring for the intermediate circuit:
This responds as soon as the intermediate circuit voltage
exceeds the operating voltage range. The final output
stage is then switched off.
Temperature monitoring for the heat sink: The heat sink
temperature of the final output stage is measured with a
Festo P.BE−SEC−AC−HW−EN en 0511c