Manual MRM3-2 GB
Woodward
TD_MRM3-2_09.08_GB_Rev.New
39
5.12 Digital Inputs
5.12.1 Parameter Set Changeover Switch
When voltage is applied to this input it is changed over to the other parameter set.
5.12.2 External Trigger of the Fault Recorder
Via this input fault recording can be triggered without the MRM3-2 necessarily recognizing a trip.
5.12.3 Recognition of “Motor Running” Condition
This input can be used if the motor runs without load and does not need much current (I < 2% x
IN). In such a case the motor current may lie below the STOP threshold and so recognition of the
RUNNING conditions is not secure. In order to maintain the RUNNING conditions, voltage can be
applied to this input by means of an aux. contact of the CB. This is necessary so that all functions
which depend on the RUNNING conditions can operate faultless (e.g. I>> LAUF, I>, start counter
etc.) and the LEDs are signaling the correct motor status. In such a case the under load element
must not be used. (I< must be set to EXIT)
5.12.4 Undelayed External Trip
A trip is immediately triggered if voltage is detected by this input. The fault recorder is activated and
the assigned output relay picks up.
5.12.5 Delayed External Trip
In principle this input has the same effect as the input for undelayed trip, but a trip is only triggered
if the input signal was available during the entire adjusted delay time.
