Chapter 5—System Configuration and Operation
90
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
Control Settings
The following parameters are used to configure the auto
transformer reduced voltage motor starter control profile and
the C445 sources of control.
Table 17. Auto Transformer Configuration Parameters
Fieldbus Control Word
The auto transformer reduced voltage motor starter profile
will accept the following control commands over a fieldbus
network.
Control Bits
Bit 0
0 = Stop command, de-activate all control outputs
1 = Run1 command, begin start sequence
Bit 2
This bit can be used to switch between Local and
Remote from the network when the Allow Remote
Control Switch parameter is enabled.
Bit 3
0 = No action
1= Reset fault (will clear fault provided condition
has cleared)
Bit 5
0 = No action
1= The C445 will issue a “Test Trip” fault causing
the Outputs 1-3 control relays to open
Control Status Word
The control status word of the auto transformer reduced
voltage motor starter profile can be accessed over the
fieldbus network.
Status Bits
Bit 0
0 = Stopped (No active Run1 command)
1= Running1 (Run1 command is present)
Bit 2
0 = local control source active
1= remote control source is active
Bit 3
0 = no fault present
1= C445 fault present
Bit 4
0 = no warning present
1= C445 warning present
Bit 5
0 = no inhibit present
1= C445 control inhibit present
Bit 6
0 = C445 not ready (fault and/or inhibit present)
1= C445 ready for control (No fault or inhibit present)
Bit 7
0 = motor is not up to speed (AtRef)
1= C445 has detected motor is up to speed on
delta winding (AtRef)
Two conditions will set the AtRef bit, signaling the motor is
up to speed.
●
After transitioning to the full voltage output, if motor
current increases above 115% of the active overload FLA
rating and then decreases back below 115% of the active
overload FLA rating, it is determined the motor has come
up to speed and the AtRef bit will be set.
●
After transitioning to the full voltage output, if motor
current exceeds 30% of the active overload FLA rating and
remains until after the start delay time expires the motor is
determined to be up to speed and the AtRef bit will be set.
Configuration Parameter
Modbus Register Description
Read/Write
*C445 Active Operation Mode
700
Parameter selects control profile;
Set to “6” for auto transformer reduced voltage motor starter
R/W
Control Fault Delay
701
Delay time from change in command before a control fault is issued. Setting of “0”
disables this protection.
R/W
Network Contactor Settle Time
704
Settle delay time before second contactor is activated – ensures the first contactor
is sealed in before applying the line (in 10 ms)
R/W
Maximum Star Winding Time
705
Maximum time the control will stay on the reduced voltage output before
transitioning to full voltage (in 100 ms)
R/W
Motor#1 Overload FLA Scaled
900
Parameter to set motor nameplate full load amp rating for overload and motor
protections
R/W
Motor#2 Overload FLA Scaled
901
Not used
R/W
Motor Overload Trip FLA
500
Parameter holds active motor overload FLA rating (will contain the motor1 setting)
R
Trip Enable Bit Field
1000-1001
Trip (Fault) protection enable bits
Set bits to enable desired motor protections
R/W
Warn Enable Bit Field
1002-1003
Warning protection enable bits
Set bits to enable desired motor protections warnings
R/W
*C445 Local Source Selector
711
See Section – C445 Local/Remote Control Source Selection
R/W
C445 Remote Source Selector
712
See Section – C445 Local/Remote Control Source Selection
R/W
