Chapter 5—System Configuration and Operation
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
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65
Overload Only Operation Mode
Description
The Overload only mode uses the Motor 1 parameters for all
control/protections.
C445 outputs:
●
Output 1 is used as the fault contact. It is a normally open
contact.
●
Outputs 2 and 3 are general purpose outputs
At power up, the C445 Motor Management relay closes
Output 1, provided the C445 is in the “Ready” state (no
faults or inhibits active). This normally open fault contact
provides fail-safe operation in case power is lost.
Outputs 2 and 3 are user configurable outputs that may be
used to indicate a Fault, Trip, Motor or Warning status as well
as general purpose outputs controlled by the fieldbus
master.
The Overload Only Operation mode does not control the
contactor/motor, but it does protect it. Per the output wiring
diagrams shown later in this section, a control source must
be used in series with the normally open fault contact for
control.
The only control allowed for this Operation Mode from any of
the three potential sources, User Interface, Fieldbus or
Fieldwire is to Reset a Fault or Test Trip the unit.
Recommended User Interface Options for the
Overload Only Operation Mode
Figure 59. C445UM: Monitoring User Interface
The Monitoring User Interface can be used with any
operation mode. In Overload Only, the start and stop buttons
will be disabled. If a user presses a control button, the screen
will notify them that the functionality is not enabled. The
reset button will still function but can be disabled if desired in
User Interface Settings. Monitoring, Navigation, and
Parameter settings are all available. Test Trip is also available
in PRG
R
Service.