Protect Switch 400V motors
Version:
3.0 | 14.02.2021
instruction manual | 1162723-00000
page
24
from
29
8.1.3.3
Resetting the motor protection (acknowledging faults)
There are two possibilities to acknowledge the tripped motor protection and to reset the component to the
operating state.
8.1.3.3.1 Manual (Reset button)
Press the reset button (11) on the front panel of the ELR (see chapter 5.1.3.1).
8.1.3.3.2 Automatic reset
The device performs an automatic acknowledgement after the motor protection monitoring responds and
then cools down.
This function is guaranteed by the correct wiring of the component.Function maintained through correct
circuit.
If the higher-level control system (PLC) does not switch off the affected output for controlling the motor after
detecting the overload by evaluating the input bit Y.0 = 1 or, in the case of the "parallel interface" variant pin
2, the connected consumer (motor) is restarted immediately after the automatic reset
8.1.3.4
Symmetry identification
Motor currents are measured at phases L1 and L3 and monitored for symmetry.
If the motor currents differ by >= 33 %, the motor switches off within 2 minutes.
If the motor currents differ by >= 67 % (e.g. phase failure), the motor switches off
within 2 seconds.
