Allen-Bradley 1404-M4, User Manual

Page: 48 / 356

Publication 1404-UM001D-EN-E - October 2004
3-22 Powermonitor 3000 Operations
Refer to Table 3.7 for a summary of basic and advanced device
configuration settings. You may use a copy of this table to record your
configuration settings.
Basic Device Configuration
The basic unit configuration sets the wiring mode, PT ratios and CT
ratios to match your power system. Every Powermonitor 3000 requires
basic configuration. To perform basic configuration using the Display
Module, navigate through these menus:
PROG. > PASS? >
CONFIGURATION
>
BASIC
. You may also set the basic device
configuration via communications by writing to Table A.4.
Wiring Mode
Select the wiring mode to match the physical configuration of your
power system. Your wiring mode choice must match the wiring
diagrams found in the Installation Manual for proper operation and
accuracy. Your choices are:
•
Delta 3 CT
•
Delta 2 CT
•
Direct Delta 3 CT
•
Direct Delta 2 CT
•
Open Delta 3 CT
•
Open Delta 2 CT
•
Wye (default)
•
Single Phase
•
Demo
You may choose Demo mode for training or demonstration purposes.
In demo mode, the Powermonitor 3000 returns internally generated
results.
PT and CT Ratios
You may directly connect the voltage inputs of the Powermonitor
3000 to power systems rated at 600 volts line-to-line or less. Above
600 volts, you will need potential transformers (PTs) to step down the
power system voltage to one that is measurable. Most commercially
available PTs have a secondary rated voltage of 120 volts (150 volts
full-scale).
Nearly every Powermonitor 3000 installation will require CTs to step
down the power system current to a value of 5 amps full-scale.