4
Safety Considerations
Safety Manual
MN042004EN March 2017 www.eaton.com
Measurement Module Features
•
0.3-136 A pass-through current measurement
•
External CTs for applications up to 800A
•
Optional line voltage measurement and protection
•
Optional positive temperature coefficient (PTC) protection
•
DIN-Rail or panel mounting
•
The measurement module is powered through its cable con-
nection to the base control module.
Measurement
Module Top
PTC Terminal
RJ-12 Terminal
Voltage Terminals
Pass through
current
measurement
Measurement
Module Bottom
Voltage Terminals:
Optional Factory installed terminals for
measuring line voltage. Required for monitoring voltage,
power and energy and related protection features. Cannot
be installed in the field.
PTC Terminal:
Optional factory installed terminal for Positive
Temperature Coefficient (PTC) protection. PTC protection
uses temperature measurement signals from the motors
stator windings. Cannot be installed in the field.
RJ-12 Terminal:
Connection port to the base control module.
Pass through current measurement:
for measuring motor
lead current from 0.3 to 136 A.
Pre-defined Operation Modes
There are 11 selectable Operation modes for the C445. This
section describes the modes in detail. Selecting one of these
modes will determine the behavior of the relay’s inputs and
outputs.
Active Operation Mode
The Active Operation Mode parameter is used to select the
active mode. Any change to this parameter will require a soft
reset or power cycle before the new mode takes effect. The fol-
lowing modes are supported:
•
Overload Only
•
Direct (FVNR)
•
Reverser (FVR)
•
Star/Delta
•
Two Speed Two Winding
•
Two Speed Dahlander
•
Auto Transformer
•
Solenoid Valve
•
MCCB Actuation
•
Contactor Feeder
•
General Purpose Input / Output
Overload Only Operation Mode
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 inhib-
its 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.