Bulletin No. 3020IB9814
December 1998
48
Setting the PT Ratio The circuit monitor supports one primary PT rating. The allowable range is 1
to 1,700,000 volts. The factory default PT secondary is 120 V.
To change the primary PT rating, complete the following steps:
1. Press the MODE button until the red LED next to [Setup] is lit.
The circuit monitor displays “ConFig”.
2. Press the PHASE [Enter] button to select the Configuration option.
The circuit monitor displays the password prompt “P - - - -.”
3. Enter the master password.
To enter the password, use the SELECT METER [Value] buttons to
increase or decrease the displayed value until it reaches the password
value. Then press the PHASE [Enter] button.
3. Press the PHASE [Enter] button twice.
The red LED next to the [PT Primary] item flashes. The 3-PHASE LED
lights, and the circuit monitor displays the primary PT rating for the
3-Phase PTs.
4. Press the SELECT METER [Value] buttons until the desired primary PT
rating is displayed.
5. Press the MODE button once.
The red LED next to [Accept] flashes. The red LED next to [PT Primary]
glows steadily.
6. To reject the new PT rating, press the PHASE [Enter] button once.
The circuit monitor returns to METERS mode.
7. To accept the new PT rating, press the up arrow SELECT METER
[Value] button to change from No to Yes. Then, press the PHASE [Enter]
button.
Setting the System Type For the circuit monitor to meter correctly, you must specify the system
connection type. The circuit monitor supports three system wiring
connections. Table 4-2 shows the system connection types. The factory
default is 40.
Table 4-2
Supported System Type System Code Selections
System Type # Phase CTs Aux CT # PTs PT Conn. System Code
3∅, 3-wire 2 None 2 Open Delta 30
Delta
3∅, 4-wire 3 None 3 Wye-Wye 40
Wye, Grounded
3∅, 4-wire 3 1 (Neut) 3 Wye-Wye 41
Wye, Grounded
3∅, 4-wire 3 None 2 Open Wye 42
Wye, Grounded
3∅, 4-wire 3 1 (Neut) 2 Open Wye 43
Wye, Grounded
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