Chapter 6—Motor Protection
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
139
High Power
The High Power protection monitors the kW consumed
(supply side) by the load and will trip the motor if the
measured value exceeds the set threshold. The High Power
protection is active when the motor is in the Running state.
The rated power is calculated from the rated HP input by
the user.
Table 51. High Power
Peak Demand Alarming
A utility company’s bill is based on consumption (kWHr) and
more typically on peak demand in the last month. In the US
demand is typically calculated as the average kW in a 15
minute window. The peak demand is simply the maximum
value of the calculated demand. Industrial users may have
rather sophisticated load shedding and demand response
processes running at the feeder level or higher.
The C445 will provide a simplified demand warning system
that will provide the current demand estimate, a resettable
peak demand (with date and time stamp) stored in
nonvolatile memory, and a demand warning threshold. The
time window for demand calculation will be adjustable to
provide for more flexibility.
Table 52. Peak Demand
Fault
Code
Modbus
Fault Action
Delay (Seconds)
Protection
Action
Units
Min.
Max.
Default
Min.
Max.
Default
Modbus
15
High Power
Fault Trip
1046
%
–200
200
110
1
60
20
1048
Fault Warning
1047
%
–200
200
110
1
60
2
1079
Fault
Code
Modbus
Fault Action
Protection
Parameter
Units
Min.
Max.
Default
Peak Demand
Demand Window Duration
1054
Minutes
1
240
15
Peak Demand Warning Threshold
1052
Watts
0
Peak Demand
Watts
Present Demand
Watts
Demand Timestamp
Unix